The Chevrolet 1.5 A15SMS engine is designed for Chevrolet Lanos (Daewoo Lanos) cars.
Peculiarities. The A15SMS engine is a further development of the G15MF engine, which was installed on the Daewoo Nexia before restyling. The engine received some improvements, such as: a valve cover made of special plastic, additional sensors for the engine management system appeared, an intake receiver of a different shape, an electronic ignition module appeared. The engine was installed with two catalytic converters and two oxygen concentration sensors. This made it possible to achieve compliance with EURO 3 environmental standards. Also, in addition, a camshaft position sensor and a knock sensor were installed on the power unit.
The engine is similar in design to the engines used to install Kadett E and Ascona C, so it is difficult to expect outstanding performance from this motor. Therefore, the engine cannot boast of low fuel consumption.
Timing drive - belt. When the belt breaks, the valves bend. Hydraulic compensators are installed in the head, gap adjustment is not needed.
It is worth noting that this engine has a fairly good resource. Engine resource 1.5 A15SMS is about 200-250 thousand km. It is not uncommon to run more than 300 thousand km without major repairs.
Engine characteristics Chevrolet 1.5 A15SMS Lanos
| Parameter | Meaning |
|---|---|
| Configuration | L |
| Number of cylinders | 4 |
| Volume, l | 1,498 |
| Cylinder diameter, mm | 76,5 |
| Piston stroke, mm | 81,5 |
| Compression ratio | 9,5 |
| Number of valves per cylinder | 2 (1-inlet; 1-outlet) |
| Gas distribution mechanism | SOHC |
| The order of operation of the cylinders | 1-3-4-2 |
| Rated engine power / at engine speed | 63 kW - (86 hp) / 5800 rpm |
| Maximum torque / at revs | 130 Nm / 3400 rpm |
| Supply system | Distributed injection with electronic control |
| Recommended minimum octane number of gasoline | 92 |
| Environmental regulations | Euro 3 |
| Weight, kg | - |
Design
Four-stroke four-cylinder gasoline with an electronic fuel injection and ignition control system, with an in-line arrangement of cylinders and pistons rotating one common crankshaft, with an overhead single camshaft. The engine has a closed-type liquid cooling system with forced circulation. Lubrication system - combined.
The cylinder block is made of cast iron, the cylinders are bored directly into the body of the block. Cast iron crankshaft with eight counterweights. Connecting rods steel, forged. Aluminum pistons with holes for the piston pin offset by 0.7 mm along the axis of symmetry towards the rear wall of the cylinder block. Aluminum cylinder head, eight-valve. The valves are equipped with a single spring and are actuated via push levers.
Service
Changing the oil in the A15SMS engine 1.5. An oil change in a Chevrolet Lanos with a 1.5 liter A15SMS engine is done every 10 thousand km (some car owners change the oil every 7-8 thousand km). The volume of oil in the engine is 3.75 liters. When changing the oil, along with the filter, 3.3-3.5 liters of oil enter, if you do not change the filter, then a little less enters. Oil suitable for SAE - 5W30 and 5W40.
Timing belt replacement. According to the maintenance regulations, the condition of the timing belt should be checked after 50 thousand km. The belt must be replaced after 60 thousand kilometers. With the replacement of the timing belt, it is necessary to replace the tension roller.
Daewoo Nexia 2008. There is steam coming out from under the cap of the expansion tank (white smoke)
Breakdown of the cylinder head gasket
The most common answer to such a problem is a burnt cylinder head gasket (cylinder head), if it is not difficult for you to disassemble the engine, your first thought would be to change this gasket. But imagine that there are two more reasons for the antifreeze to be squeezed out of the system.
1- This is an air plug in the coolant system, because of it not only the stove in the cabin may not work, but this is already a sign of a plug in the coolant - coolant, provided that your liquid level is normal, but the thermostat may not work correctly. Which can lead to an increase in pressure in the cooling system. Well, squeezing out antifreeze.
2- This is a problem associated with the expansion tank, well, and the smart lid of this tank.
To improve the circulation of coolant through the engine system, when the engine is started, a slight pressure is created by the pump, which increases the efficiency of the cooling system. If insufficient pressure is created in the coolant system, the engine will heat up faster. Which can lead to boiling or decomposition of antifreeze. When boiling, the decomposition of antifreeze vapors look for weak points. Such as wooden rubber o-rings of the cooling system, bad pipes, the cap of the expansion tank or radiator is not tightened tightly.
The cylinder head is, of course, also not a secondary problem, but it is also quite possible to diagnose it, and as it turned out, it was very simple.
We start the engine, open the cap of the expansion tank, if at idle you see bubbles that come from the main hose, this is one of the two, either the air plug breaks, or there is a problem with the cylinder head gasket.
If this is an air lock, then after gasping and waiting for some time, you can get rid of it, the most effective procedure is very difficult to describe, since you need to carry out a series of sequential actions and it is better to show them on camera.
If there is no plug and there is a problem with the cylinder head, then you will have constant or weak seething in the expansion barrel or the antifreeze level will gradually go away.
If your coolant goes somewhere and there are no traces on the engine, then there may be coolant either in the cylinder or in the muffler, which also often happens. This indicates a problem with the cylinder head.
Expansion tank malfunctions
First, be sure to look at the smudges of antifreeze on the barrel, there are three problems with it:
1- the cover of the expansion tank (the cover gasket is hardened) allows air to pass through, there is also a deformation of the cover of the RB - the expansion tank - only a replacement for the original.
2- the expansion tank cap thread is broken, in this case a new cap will not help for a long time!
3- the expansion barrel has a leak or burst along the seam, which manifests itself from an increase in pressure in the engine coolant system, there are such cases that as the internal combustion engine cools, the gap joins and the coolant stops squeezing out.
4- air leak (sometimes, but rarely)
Most importantly, this is a visual inspection for both leaks and damage to the hoses.
Pay attention to the thread on which the tank cap was twisted.
It happens that if you tighten the cap, it gets crooked and the liquid easily comes out of the tank. If you look at the thread of the tank, it’s not really clear whether it’s whole or not, but if you highlight it on one side, it’s all torn off.
Other reasons
1. A white emulsion (foam) on the oil level dipstick or on the oil filler cap indicates that coolant has entered the lubrication system, most likely through a hole in the cylinder head gasket. Sometimes, though rarely, the gasket is safe and sound, and the leak is due to a crack in the block itself. But in any case, if there is a white emulsion in the lubrication system, you need to sound the alarm, or even better, pick up a tool and fix the problem.
2. White smoke from the exhaust pipe when the engine is running indicates that coolant has entered the engine cylinder(s). At the same time, its level decreases, since it partially “flies into the pipe”. The exhaust of a car can be white when the engine is warming up, there is a large amount of condensate and high humidity - this is not a malfunction, but if it always smokes a lot, it is worth considering.
3. Oil stains on the surface of the coolant in the expansion tank or in the radiator indicate the penetration of oil where it should not be.
The reason is most likely a faulty cylinder head gasket. It's worth at least checking it out.
4. Bubbles escaping through the expansion tank or radiator indicate that exhaust gases have entered the coolant. There is a hole somewhere, and most likely it is in the head gasket. A certain amount of bubbles may appear when replacing the coolant - this is normal, but if the antifreeze constantly "bubbles" - then something is wrong.
5 . Clogged oil filler neck
6. Antifreeze goes out from under the exhaust manifold mounting studs
8. Water from the radiator enters the cylinder block - it is necessary to replace the radiator
Chevrolet Lanos 1.5 engine liters with a capacity of 86 horsepower is essentially a development of Opel engineers. This is a gasoline aspirated from the A15SMS series, which can be found on Daewoo Nexia. A simple and reliable 8-valve engine has a number of design features, which we will discuss in more detail. 
Chevrolet Lanos 1.5 engine device
Engine Lanos 1.5 gasoline, four-stroke, four-cylinder, in-line, eight-valve, with an overhead camshaft. The location in the engine compartment is transverse. The order of operation of the cylinders: 1-3-4-2, counting - from the auxiliary drive pulley. Power system - phased distributed fuel injection (Euro-3 toxicity standards). The motor has a cast iron cylinder block.
An engine with a gearbox and a clutch form a power unit - a single unit, fixed in the engine compartment on three elastic rubber-metal supports. The right support is attached to the bracket located on the front wall of the cylinder block, and the left and rear - to the gearbox housing.
Cylinder head of Chevrolet Lanos 1.5 engine
The cylinder head of the Chevrolet Lanos 8 valves is cast from aluminum alloy, common to all four cylinders. The head is centered on the block with two bushings and fastened with ten bolts. A gasket is installed between the block and the cylinder head.
On opposite sides of the cylinder head are the intake and exhaust ports. Seats and valve guides are pressed into the cylinder head. The valve closes under the action of one spring. Its lower end rests on a washer, and its upper end rests on a plate held by two crackers. The crackers folded together have the shape of a truncated cone, and on their inner surface there are beads that enter the grooves on the valve stem. Actuates the valves on the camshaft. The cast iron camshaft rotates on five supports (bearings) in an aluminum bearing housing that is attached to the top of the cylinder head.
Timing drive engine Chevrolet Lanos 1.5
The camshaft drive of the 8-valve Lanos engine is carried out by a toothed belt from the crankshaft. The valves are actuated by the camshaft cams through pressure levers, which are supported by one shoulder on the hydraulic clearance compensators, and by the other shoulder through the guide washers - on the valve stems.
The engine has hydraulic lifters, which are self-adjusting pressure lever supports. Under the influence of oil filling under pressure the internal cavity of the compensator, the compensator plunger selects the clearance in the valve actuator. The use of hydraulic compensators in the valve drive reduces the noise of the gas distribution mechanism, and also eliminates its maintenance.
In the event of a break in the valve belt, it bends unambiguously! Among other features, it can be noted that the timing belt rotates the pump (water pump). The belt is replaced every 60 thousand kilometers, the pump must be changed every 120 thousand kilometers.
Technical characteristics of the engine Lanos 1.5 8 valves
- Working volume - 1498 cm3
- Number of cylinders - 4
- Number of valves - 8
- Cylinder diameter - 76.5 mm
- Stroke - 81.5 mm
- Timing drive - belt
- HP power - 86 at 5800 rpm. in min.
- Torque - 130 Nm at 3400 rpm. in min.
- Maximum speed - 172 km / h
- Acceleration to the first hundred - 12.5 seconds
- Fuel type - gasoline AI-92
- Fuel consumption in the city - 10.4 liters
- Combined fuel consumption - 6.7 liters
- Fuel consumption on the highway - 5.2 liters
Chevrolet Lanos, also known as Daewoo Lanos, was produced in huge quantities in Korea, China, India, Poland, Ukraine ... often the model could have different names, but structurally it is the same budget car.
Complexity
Without toolsNot marked
The engine management system consists of an electronic control unit (ECU), sensors for engine and vehicle operation parameters, as well as actuators.
Elements of the electronic engine management system F16D3:
1* - phase sensor;
2
3*
4* - diagnostic block;
5*
6* - knock sensor;
7
8* - speed sensor;
9*
10*
11 - accumulator battery;
12
13*
14 - ignition coils;
15*
16*
17* - spark plug;
18* - diagnostic oxygen concentration sensor.
Note:
*
Diagram of the electronic engine management system F16D3:
1 - accumulator battery;
2 - ignition switch;
3 - ignition relay;
4 - ECU;
5 - diagnostic block;
6 - a combination of devices;
7 - air conditioner switch;
8
9 - air conditioning compressor;
10 - wheel speed sensor;
11
12 - air conditioning refrigerant pressure sensor;
13
14 - control oxygen concentration sensor;
15 - crankshaft position sensor;
16 - ignition coils;
17
18 - nozzle;
19 - phase sensor;
20 - intake air pressure sensor;
21
22 - knock sensor;
23 - valve of the system for changing the length of the intake tract;
24 - adsorber purge valve;
25 - coolant temperature sensor;
26 - throttle position sensor;
27 - idle speed regulator;
28
29
30
31 - fuel pump relay;
32 - fuel pump assembly.
Elements of the electronic engine management system A15SMS:
1* - crankshaft position sensor;
2 - air temperature sensor at the inlet to the engine;
3 - phase sensor;
4* - throttle position sensor;
5* - diagnostic block;
6* - electronic control unit;
7 - intake air pressure sensor;
8* - diagnostic oxygen concentration sensor;
9* - knock sensor;
10* - a control lamp of malfunction of a control system;
11* - mounting block fuses and relays;
12 - rough road sensor;
13* - speed sensor;
14 - accumulator battery;
15 - ignition coil;
16* - coolant temperature sensor;
17* - control oxygen concentration sensor;
18* - spark plug.
Note:
* - the item is not visible in the photo.
Diagram of the electronic engine management system A15SMS:
1 - accumulator battery;
2 - ignition switch;
3 - ECU;
4 - diagnostic block;
5a, 5b- intake air pressure sensor;
6 - intake air temperature sensor;
7 - coolant temperature sensor;
8 - the relay of a high speed of rotation of the fan of the cooling system;
9 - the relay of low speed of rotation of the fan of the cooling system;
10 - cooling system fan;
11 - knock sensor;
12 - vehicle speed sensor;
13 - a combination of devices;
14 - phase sensor;
15 - control and diagnostic oxygen concentration sensors;
16 - rough road sensor;
17 - air conditioner switch;
18 - air conditioning compressor relay;
19 - air conditioning compressor;
20 - fuel pump relay;
21 - fuel pump assembly;
22a, 22b- adsorber purge valve;
23 - ignition coil;
24 - exhaust gas recirculation valve;
25 - idle speed regulator;
26 - throttle position sensor;
27 - nozzles;
28 - crankshaft position sensor.
ECU (controller) is a special purpose minicomputer. It consists of random access memory (RAM) and programmable read only memory (PROM). RAM is used by the microprocessor for temporary storage of current information about the operation of the engine (measured parameters) and calculated data. From the RAM, the engine control unit takes programs and raw data for processing. Fault codes are also stored in the RAM. This memory is volatile, i.e. when the power supply is interrupted (the battery is disconnected or the wiring harness block is disconnected from the computer), its contents are erased. PROM stores the engine control program, which contains a sequence of operating commands (algorithms) and calibration data - settings. PROM is non-volatile, i.e. The contents of the memory do not change when the power is turned off. The ECU receives information from the sensors of the system and controls the actuators, such as the fuel pump and injectors, the ignition coil, the idle speed controller, the heating element of the oxygen concentration sensor, the canister purge valve, the exhaust gas recirculation valve, the valve for changing the length of the intake tract (on the F16D3 engine ), air conditioning compressor clutch, cooling fan.
ECU (controller) of the F16D3 engine
Engine ECU (controller) A15SMS
The electronic control unit on a car with an F16D3 engine is located in the engine compartment in front of the battery, and on a car with an A15SMS engine - in the car interior under the instrument panel on the right (under the side trim).
Placement of the ECU (controller) of the F16D3 engine
Placement of the ECU (controller) of the A15SMS engine
In addition to supplying voltage to the sensors and controlling actuators, the ECU performs diagnostic functions of the engine management system (on-board diagnostic system): it determines the presence of malfunctions of elements in the system, turns on the malfunction indicator lamp in the instrument cluster and stores fault codes in its memory. If a malfunction is detected, in order to avoid negative consequences (burning of the pistons due to detonation, damage to the catalytic converter in the event of misfires in the air-fuel mixture, exceeding the limit values for exhaust gas toxicity, etc.), the ECU switches the system to emergency operating modes. Their essence is that in case of failure of any sensor or its circuit, the engine control unit uses replacement data stored in its memory.
Control lamp of malfunction of a control system of the engine located in the instrument cluster.
Placement of a control lamp of malfunction of a control system of the engine in a combination of devices
If the system is working, then when the ignition is turned on, the control lamp should light up. Thus, the ECU checks the health of the lamp and control circuit. After starting the engine, the control lamp should go out if there are no conditions in the computer memory for it to turn on. Turning on the lamp when the engine is running informs the driver that the on-board diagnostic system has detected a malfunction, and further movement of the car occurs in emergency mode. In this case, some parameters of the engine operation (power, throttle response, economy) may deteriorate, but movement with such malfunctions is possible, and the car can drive to the service station on its own.
If the fault was temporary, the ECU will turn off the lamp for three trips without a fault.
Fault codes (even if the lamp is off) remain in the unit's memory and can be read using a special diagnostic tool - a scanner that is connected to the diagnostic block.
Diagnostic block (diagnostic socket) located in the passenger compartment under the instrument panel on the right (under the upholstery of the sidewall).
Location of the diagnostic connector
For access to block of diagnostics take out a cap of an upholstery of the right sidewall.
Access to the diagnostic socket
When the fault codes are cleared from the memory of the electronic unit using the diagnostic tool, the malfunction indicator lamp in the instrument cluster goes out.
The sensors of the control system give the ECU information about the parameters of the engine and the car, on the basis of which it calculates the moment, duration and order of opening of the fuel injectors, the moment and order of sparking.
crankshaft position sensor on the F16D3 engine it is located on the front wall of the cylinder block under the oil filter, and on the A15SMS engine it is on the oil pump housing.
Engine crankshaft position sensor F16D3
A15SMS engine crankshaft position sensor
The sensor gives the control unit information about the speed and angular position of the crankshaft. The sensor is of an inductive type, it reacts to the passage of the teeth of the setting disk near its core, attached to the cheek of the crankshaft of the 4th cylinder - on the F16D3 engine or combined with the auxiliary drive pulley - on the A15SMS engine. The teeth are located on the disk with an interval of 6 °. To determine the position of the crankshaft, two teeth out of 60 are cut off, forming a wide groove. When this groove passes by the sensor, a so-called “reference” synchronization pulse is generated in it.
The installation clearance between the sensor core and the tooth tips is approximately 1.3 mm. When the drive disk rotates, the magnetic flux in the magnetic circuit of the sensor changes - alternating current voltage pulses are induced in its winding. Based on the number and frequency of these pulses, the ECU calculates the phase and duration of the pulses for controlling the injectors and ignition coils.
Installation location of the crankshaft position sensor on the F16D3 engine:
1 - oil pan;
2 - cylinder block;
3 - sensor socket;
4 - encoder drive.
Phase sensor (camshaft position) on the F16D3 engine attached to the right end of the cylinder head next to the exhaust camshaft pulley. The phase sensor on the A15SMS engine is mounted on the rear wall of the camshaft bearing housing next to the camshaft sprocket.
The signal from the phase sensor is used by the ECU to coordinate the fuel injection processes in accordance with the order of operation of the cylinders. The principle of operation of the sensor is based on the Hall effect. To determine the position of the piston of the first cylinder during the working stroke on the F16D3 engine, the phase sensor responds to the passage of a protrusion made at the end of the exhaust camshaft pulley.
Engine phase sensor F16D3
The mutual position of the phase sensor and the exhaust camshaft pulley on the F16D3 engine (for clarity, shown on the dismantled parts):
1 - camshaft pulley;
2 - ledge;
3 - sensor;
4 - sensor mounting plate.
On the A15SMS engine, the sensor reacts to the passage of a tide made on the toe of the camshaft.
Motor phase sensor A15SMS
Depending on the angular position of the shaft, the sensor outputs rectangular voltage pulses of different levels to the control unit. Based on the output signals of the crankshaft and camshaft position sensors, the control unit sets the ignition timing and determines the cylinder into which fuel should be supplied. If the phase sensor fails, the ECU switches to the non-phased fuel injection mode.
coolant temperature sensor on the F16D3 engine, it is screwed into the threaded hole in the rear wall of the cylinder head, between the air supply channels of the 1st and 2nd cylinders. On the A15SMS engine, the sensor is installed on the left side of the cylinder head. The sensor rod is washed by the coolant circulating through the cooling jacket of the cylinder head.
Coolant temperature sensor for F16D3 and A15SMS engines
The sensor is an NTC thermistor, i.e. its resistance decreases with increasing temperature. The ECU supplies a stabilized voltage of +5.0 V to the sensor through a resistor and, based on the voltage drop across the sensor, calculates the coolant temperature, the values of which are used to adjust the fuel supply and ignition timing.
Throttle position sensor mounted on the throttle shaft and is a potentiometric type resistor.
A stabilized voltage of +5.0 V is supplied to one end of its resistive element from the ECU, and the other end is connected to the "mass" of the electronic unit. From the third output of the potentiometer (slider), which is connected to the throttle valve axis, a signal is taken for the control unit. By periodically measuring the output voltage of the sensor signal, the ECU determines the current throttle position to calculate the ignition timing and the duration of the fuel injection pulses, as well as to control the idle speed controller.
Throttle position sensor for F16D3 and A15SMS engines
Absolute pressure (vacuum) air intake sensor evaluates changes in air pressure in the intake manifold receiver, which depend on the load on the engine and the speed of its crankshaft, and converts them into voltage output signals. Based on these signals, the ECU determines the amount of air entering the engine and calculates the required amount of fuel. To supply more fuel at a large throttle opening angle (the vacuum in the intake manifold is negligible), the ECU increases the operating time of the fuel injectors. With a decrease in the throttle opening angle, the vacuum in the intake manifold increases and the ECU, processing the signal, reduces the operating time of the injectors. The intake manifold absolute pressure sensor allows the ECU to make adjustments to the operation of the engine when atmospheric pressure changes depending on the altitude above sea level.
On a car with an F16D3 engine, the absolute air pressure sensor is attached to the intake manifold housing and connected by a tube to its receiver.
Intake absolute pressure sensor used on F16D3 and A15SMS engines
On a car with an A15SMS engine, two versions of absolute air pressure sensors are used, which are attached to the bulkhead and connected to the intake manifold receiver by a tube. In the first option, the sensor is exactly the same as on a car with an F16D3 engine (see photo above). In the second option, the sensor is different.
Intake absolute pressure sensor used on a vehicle with an A15SMS engine
Intake air temperature sensor on a car with an F16D3 engine, it is mounted in a corrugated air supply hose to the throttle assembly. On a vehicle with an A15SMS engine, the sensor is mounted in the air filter cover. The sensor is a thermistor (with the same electrical characteristics as the coolant temperature sensor) that changes its resistance depending on the air temperature. The ECU applies a stabilized voltage of +5.0 V to the sensor through a resistor and measures the change in signal level to determine the intake air temperature. The signal level is high when the air in the pipeline is cold and low when the air is hot. The information received from the sensor is taken into account by the ECU when calculating the air flow to correct the fuel supply and the ignition timing.
Location of engine air temperature sensor F16D3
A15SMS Engine Air Temperature Sensor Location
Knock sensor on both engines it is fixed on the rear wall of the cylinder block in the area of the 3rd cylinder.
Knock sensor for F16D3 and A15SMS engines
The piezoceramic sensitive element of the knock sensor generates an alternating voltage signal, the amplitude and frequency of which correspond to the vibration parameters of the engine block wall. When detonation occurs, the amplitude of vibrations of a certain frequency increases. In this case, to suppress detonation, the ECU corrects the ignition timing in the direction of a later ignition.
In the control system of both engines, two oxygen concentration sensors are used - control and diagnostic.
Control oxygen sensor on both engines it is installed in the exhaust manifold.
Oxygen concentration sensors for F16D3 and A15SMS engines:
1 - manager;
2 - diagnostic.
The sensor is a galvanic current source, the output voltage of which depends on the oxygen concentration in the environment surrounding the sensor. Based on a signal from the sensor about the presence of oxygen in the exhaust gases, the ECU adjusts the fuel supply by the injectors so that the composition of the working mixture is optimal for the efficient operation of the exhaust gas catalytic converter. The oxygen contained in the exhaust gases, after entering into a chemical reaction with the sensor electrodes, creates a potential difference at the sensor output, varying from approximately 0.1 to 0.9 V.
A low signal level corresponds to a lean mixture (the presence of oxygen), and a high signal level corresponds to a rich one (no oxygen). When the sensor is cold, there is no output from the sensor because its internal resistance in this state is very high - a few MΩ (the engine control system operates in an open loop). For normal operation, the temperature of the oxygen concentration sensor must be at least 300°C. In order to quickly warm up the sensor after starting the engine, a heating element is built into the sensor, which is controlled by the ECU. As the sensor warms up, the resistance drops and it begins to generate an output signal. Then the ECU starts to take into account the signal from the oxygen concentration sensor for fuel control in closed loop mode.
The oxygen sensor can be "poisoned" by the use of leaded gasoline or by the use of sealants containing high levels of highly volatile silicone (silicon compounds) in engine assembly. Silicone vapors can enter through the crankcase ventilation system into the combustion chamber of the engine. The presence of lead or silicon compounds in the exhaust gases can lead to sensor failure. In the event of a failure of the sensor or its circuits, the ECU controls the fuel supply in an open loop.
Diagnostic oxygen sensor on a car with an F16D3 engine, it is installed after the catalytic converter in the intermediate pipe of the exhaust system. On a vehicle with an A15SMS engine, the sensor is installed in the pipe of the additional muffler after the additional catalytic converter. The main function of the sensor is to evaluate the efficiency of the exhaust gas catalytic converter. The signal generated by the sensor indicates the presence of oxygen in the exhaust gases after the catalytic converter. If the catalytic converter is operating normally, the diagnostic sensor reading will differ significantly from the control sensor reading. The principle of operation of the diagnostic sensor is the same as that of the control oxygen concentration sensor.
Vehicle speed sensor mounted on the gearbox clutch housing from above, next to the gear shift mechanism.
Vehicle speed sensor
The principle of operation of the speed sensor is based on the Hall effect. The sensor drive gear is engaged with the gear mounted on the differential box. The sensor outputs rectangular voltage pulses to the computer with a frequency proportional to the speed of rotation of the drive wheels. The number of sensor pulses is proportional to the distance traveled by the vehicle. The ECU determines the speed of the car by the frequency of the pulses.
The F16D3 engine management system uses wheel speed sensor, which provides information to the electronic control unit.
Wheel speed sensor
The sensor is attached to the steering knuckle of the left front wheel. The sensor is of an inductive type, it reacts to the passage of the teeth of the driving disk near its core, which is made on the body of the outer hinge of the left wheel drive.
Location of the wheel speed sensor on a car with an F16D3 engine
The A15SMS engine management system uses rough road sensor, installed in the engine compartment on the left mudguard cup.
Rough road sensor
The rough road sensor is designed to measure the amplitude of body vibrations. The variable load on the transmission that occurs when driving on rough roads affects the angular speed of rotation of the engine crankshaft. At the same time, oscillations in the frequency of rotation of the crankshaft are similar to similar oscillations that occur during misfires of the air-fuel mixture in the engine cylinders. In this case, to prevent false detection of misfiring in cylinders, the ECU disables this function of the on-board diagnostic system when the sensor signal exceeds a certain threshold.
Ignition system is part of the engine management system and consists of an ignition coil (on the F16D3 engine - 2 pcs.), high-voltage wires and spark plugs. In operation, the system does not require maintenance and adjustment, except for the replacement of candles. The control of the current in the primary windings of the coils is carried out by the ECU, depending on the operating mode of the engine. Spark plug wires are connected to the terminals of the secondary (high-voltage) windings of the coils: to one coil of the 1st and 4th cylinders, to the other - of the 2nd and 3rd. Thus, the spark simultaneously jumps in two cylinders (1-4 or 2-3) - in one at the end of the compression stroke (working spark), in the other at the end of the exhaust stroke (idle). The ignition coil is non-separable, in case of failure it is replaced.
F16D3 engine ignition coil
A15SMS engine ignition coil
The F16D3 engine uses NGK BKR6E-11 spark plugs or equivalents from other manufacturers. The gap between the electrodes of the candle is 1.0-1.1 mm. The size of the hexagon of the turnkey candle is 16 mm.
Engine spark plug F16D3
The A15SMS engine uses CHAMPION RN9YC, NGK BPR6ES spark plugs or equivalents from other manufacturers. The gap between the electrodes of the candle is 0.7-0.8 mm. The size of the turnkey hexagon is 21 mm.
A15SMS engine spark plug
When the ignition is turned on, the ECU energizes the fuel pump relay for 2 seconds to create the necessary pressure in the fuel rail. If during this time cranking of the crankshaft by the starter has not begun, the ECU turns off the relay and turns it on again after the start of cranking.
If the engine has just been started and its speed is above 400 min -1 , the control system operates in an open loop, not taking into account the signal from the control oxygen concentration sensor. At the same time, the ECU calculates the composition of the air-fuel mixture based on the input signals from the coolant temperature sensor and the engine intake air pressure sensor. After warming up the control oxygen concentration sensor, the system starts to work in a closed loop, taking into account the sensor signal. If, when trying to start the engine, it did not start and there is a suspicion that the cylinders are filled with excess fuel, they can be purged by fully depressing the “gas” pedal and turning on the starter. At this throttle position and crankshaft speed below 400 min-1, the ECU will turn off the injectors. When you release the "gas" pedal, when the throttle is less than 80% open, the ECU will turn on the injectors. When the engine is running, depending on the information received by the sensors, the composition of the mixture is regulated by the duration of the control pulse applied to the injectors (the longer the pulse, the greater the fuel supply).
During engine braking (gear and clutch engaged), when the throttle is fully closed and the engine speed is high, fuel injection is not performed to reduce exhaust emissions.
When the voltage drops in the vehicle's on-board network, the ECU increases the energy accumulation time in the ignition coils (for reliable ignition of the combustible mixture) and the duration of the injection pulse (to compensate for the increase in nozzle opening time). With an increase in the voltage in the on-board network, the energy accumulation time in the ignition coils and the duration of the pulse supplied to the injectors decrease. When the ignition is turned off, the fuel supply is turned off, which prevents the mixture from spontaneous ignition in the engine cylinders.
Note:
When servicing and repairing the engine management system, always turn off the ignition (in some cases it is necessary to disconnect the wire terminal from the “negative” battery terminal). When carrying out welding work on a vehicle, disconnect the engine management system wiring harnesses from the ECU. Before drying the car in a drying chamber (after painting), remove the computer. With the engine running, do not disconnect or adjust the engine control harness connectors or the battery terminals. Do not start the engine if the wire terminals on the battery terminals and the lugs of the "mass" wires on the engine are loose or dirty.
The A15SMS engine of Daewoo Nexia, Chevrolet Lanos cars is gasoline, four-stroke, four-cylinder, in-line, eight-valve, with an overhead camshaft.
The A15SMS engine is located transversely in the engine compartment. The order of operation of the cylinders: 1-3-4-2, counting - from the auxiliary drive pulley.
A15SMS engine power system for Daewoo Nexia, Chevrolet Lanos - phased distributed fuel injection (Euro-3 toxicity standards).
The A15SMS engine of Daewoo Nexia, Chevrolet Lanos with a gearbox and clutch form a power unit - a single unit mounted in the engine compartment on three elastic rubber-metal supports.
The right support is attached to the bracket located on the front wall of the cylinder block, and the left and rear - to the gearbox housing brackets.
Fig.1. A15SMS engine for Daewoo Nexia, Chevrolet Lanos (rear view)
1 - oil drain plug; 2 - oil pan; 3 - flywheel; 4 - cylinder block; 5 - knock sensor; 6 - crankcase ventilation pipe; 7 - inlet pipe of the coolant pump; 8 - cylinder head; 9 - fuel pressure regulator; 10 - ignition coil; 11 - oil filler cap; 12 - intake manifold of the A15SMS engine of Daewoo Nexia, Chevrolet Lanos cars; 13 - idle speed regulator; 14 - throttle position sensor; 15 - rear cover of the timing drive; 16 - phase sensor; 17 - generator; 18 - generator drive belt; 19 - generator bracket; 20 - crankshaft position sensor; 21 - low oil pressure sensor; 22 - adsorber purge valve
On the right on the A15SMS engine of Daewoo Nexia, Chevrolet Lanos cars are located: timing drive of the gas distribution mechanism and coolant pump (toothed belt), generator and power steering pump drive (poly V-belt), air conditioning compressor drive (V-belt), oil pump, thermostat, sensor crankshaft position.
On the left are: the ignition coil and the coolant temperature sensor.
Fig.2. A15SMS engine for Daewoo Nexia, Chevrolet Lanos (left view)
1 - flywheel; 2 - cylinder block; 3 - catalytic converter; 4 - exhaust manifold; 5 - oil level indicator; 6 - cylinder head; 7 - coolant temperature sensor; 8 - ignition coil; 9 - oil filler cap; 10 - exhaust gas recirculation valve of the A15SMS Chevrolet Lanos engine; 11 - intake manifold; 12 - fuel pressure regulator; 13 - fuel rail; 14 - nozzle; 15 - adsorber purge valve; 16 - inlet pipe of the coolant pump
Fig.3. A15SMS A15SMS engine for Daewoo Nexia, Chevrolet Lanos (right view)
1 - oil pan; 2 - auxiliary drive pulley; 3 - oil drain plug; 4 - generator drive belt; 5 - lower cover of the timing drive; 6 - generator bracket; 7 - generator; 8 - tension bar of the generator drive belt; 9 - throttle assembly; 10 - recirculation valve; 11 - coolant temperature indicator sensor; 12 - oil filler cap; 13 - cylinder head cover; 14 - upper cover of the timing drive of the A15SMS engine of Daewoo Nexia, Chevrolet Lanos cars; 15 - power steering pump pulley; 16 - bracket for the right support of the power unit; 17 - catalytic converter; 18 - air conditioner compressor bracket; 19 - tension roller of the air conditioning compressor drive belt
Installed on the front of the A15SMS engine are: exhaust manifold, oil filter, oil level gauge, spark plugs, air conditioning compressor (bottom right).
At the back are: an intake manifold with a throttle assembly, a fuel rail with injectors, an exhaust gas recirculation valve, a generator, a starter, an insufficient oil pressure sensor, an adsorber purge valve, a phase sensor, a knock sensor, a coolant pump supply pipe, a coolant temperature indicator sensor.
A15SMS Engine Specifications
Model - A15SMS
Engine type - Gasoline, four-stroke, four-cylinder, in-line, eight-valve (SOHC)
Location - Front, transverse
Power system - Distributed fuel injection
Cylinder diameter / piston stroke, mm - 76.5x81.5
Chevrolet Lanos engine displacement, cm3 - 1498
Compression ratio - 9.5
Rated power kW (hp) at crankshaft speed, min–1 - 63 (86) / 5 800
Maximum torque Nm at crankshaft speed, min–1 - 130 /3 400
Fuel - Unleaded gasoline with an octane rating of at least 92
Ignition system - Electronic, part of the engine management system
Toxicity standards - Euro-3
The A15SMS cylinder block of Daewoo Nexia and Chevrolet Lanos cars is cast iron, the cylinders are bored directly in the block. The cooling jacket and oil channels are made in the body of the cylinder block.
In the lower part of the cylinder block there are five crankshaft main bearing supports with removable covers, which are attached to the block with special bolts.
Holes in the A15SMS cylinder block of Daewoo Nexia, Chevrolet Lanos cars for bearings are machined with caps installed, so the caps are not interchangeable and are marked on the outer surface with numbers (account from the timing pulley).
The A15SMS crankshaft of Daewoo Nexia, Chevrolet Lanos cars is made of high-strength cast iron, with five main and four connecting rod journals. The shaft is equipped with eight counterweights cast integrally with it.
Inserts of main and connecting rod bearings of the crankshaft are steel, thin-walled, with an anti-friction coating. The main and connecting rod journals of the crankshaft connect the channels located in the shaft body. The axial movement of the crankshaft is limited by two liners with thrust collars of the third main bearing.
At the front end (toe) of the A15SMS crankshaft of Daewoo Nexia, Chevrolet Lanos cars, the following are installed: a timing gear pulley and an auxiliary drive pulley.
A flywheel is attached to the crankshaft flange with six bolts. It is cast iron and has a pressed steel ring gear for starting the engine with a starter.
Connecting rods A15SMS for Daewoo Nexia, Chevrolet Lanos - forged steel, I-section. With their lower heads, the connecting rods are connected through liners to the connecting rod journals of the crankshaft, and with their upper heads - through piston pins with pistons.
Pistons - from an aluminum alloy. The hole for the piston pin is offset relative to the axis of symmetry of the piston by 0.7 mm to the rear wall of the cylinder block. Three grooves for piston rings are machined in the upper part of the piston. The two upper piston rings are compression rings, and the lower one is oil scraper.
Piston pins steel, tubular section. In the holes of the pistons, the fingers are installed with a gap, and in the upper heads of the connecting rods - with an interference fit (pressed).
The A15SMS cylinder head for Daewoo Nexia and Chevrolet Lanos is cast from aluminum alloy, common to all four cylinders. The head is centered on the block with two bushings and fastened with ten bolts.
Fig.4. Cylinder head A15SMS for Daewoo Nexia, Chevrolet Lanos (block head cover removed)
1 - camshaft; 2 - camshaft bearing housing
A gasket is installed between the block and the cylinder head of the Chevrolet Lanos. On the front side of the cylinder head are the exhaust ports, and on the rear side are the intake ports. The spark plugs are screwed into threaded holes in the cylinder head.
Seats and valve guides are pressed into the cylinder head of the A15SMS engine of Daewoo Nexia and Chevrolet Lanos. The valve closes under the action of one spring. Its lower end rests on a washer, and its upper end rests on a plate held by two crackers.
The crackers folded together have the shape of a truncated cone, and on their inner surface there are beads that enter the grooves on the valve stem. Actuates the valves on the camshaft.
The A15SMS camshaft of the Daewoo Nexia, Chevrolet Lanos cast iron cars rotates on five bearings (bearings) in an aluminum bearing housing, which is attached to the top of the cylinder head.
Camshaft drive Chevrolet Lanos - toothed belt from the crankshaft. The valves are actuated by the camshaft cams through pressure levers, which rest on the hydraulic clearance compensators with one shoulder, and on the valve stems through the guide washers.
Fig.5. Timing gear drive A15SMS for Daewoo Nexia, Chevrolet Lanos
1 - mark on the back cover of the timing drive; 2 - mark on the gear pulley of the crankshaft; 3 - a gear pulley of a cranked shaft; 4 - tension roller; 5 - toothed pulley of the coolant pump; 6 - belt; 7 - rear drive cover; 8 - mark on the back cover of the timing drive; 9 - mark on the camshaft pulley of the Chevrolet Lanos engine; 10 - camshaft pulley
The use of hydraulic compensators in the valve drive reduces the noise of the gas distribution mechanism, and also eliminates its maintenance.
A15SMS engine lubrication for Daewoo Nexia, Chevrolet Lanos - combined. Under pressure, oil is supplied to the main and connecting rod bearings of the crankshaft, pairs of "support - camshaft journal" and hydraulic compensators.
The pressure in the system is created by an oil pump with internal gears and a pressure reducing valve. The oil pump is attached to the cylinder block on the right side. The drive gear of the pump is mounted on two flats of the toe of the crankshaft.
The A15SMS internal combustion engine oil pump of Daewoo Nexia, Chevrolet Lanos cars takes oil from the oil pan through the oil receiver and delivers it through the oil filter to the main line of the cylinder block, from which oil channels depart to the crankshaft main bearings and the oil supply channel to the cylinder head.
The oil filter is full-flow, non-separable, equipped with bypass and anti-drain valves. By spraying, oil is supplied to the pistons, cylinder walls and camshaft lobes. Excess oil flows through the channels of the cylinder head into the oil pan.
The crankcase ventilation system of the Chevrolet Lanos engine is forced, closed type. The system is designed to reduce the emission of harmful substances from the engine crankcase into the atmosphere.
Due to the vacuum in the intake manifold, gases from the crankcase through the ventilation hose enter under the cylinder head cover.
After passing through the oil separator located in the block head cover, crankcase gases are cleaned of oil particles and enter the engine intake tract through the hoses of two circuits: the main and the idle circuit, and then into the cylinders.
Through the main circuit hose, crankcase gases are discharged at partial and full load modes of operation of the A15SMS internal combustion engine of Daewoo Nexia, Chevrolet Lanos cars into the space in front of the throttle valve.
Through the hose of the idle circuit, gases are discharged into the space behind the throttle valve, both in partial and full load modes, and in idling mode.
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