The top dead center and crankshaft speed sensor, consisting of a magnet and a winding, is mounted on top of the clutch housing.
If a malfunction occurs in the sensor circuit, the engine stops working, the controller stores the malfunction code in memory and turns on the signal lamp in the instrument cluster. In this case, check the sensor and ring gear for missing teeth, runout or other damage.
You will need: key «on 10», tester.
1. Disconnect the wire from the terminal «minus» battery.
2. Disconnect the sensor harness connector.
3. Turn out two bolts of fastening of the gauge...
4.... and remove the sensor.
5. Establish the gauge of the top dead center and speed of rotation of a cranked shaft in sequence, return to removal.
Note. In order to verify the correct operation of the fuel injection system after replacing the top dead center sensor and the crankshaft speed or flywheel, it is necessary to perform a test using a special device, which includes the following:
- deceleration of the vehicle with a fuel cut in 2nd, 3rd, 4th or 5th gear at an engine speed of 3500–3000 min-1 at least 2 s;
- repeated deceleration with a fuel cut in 2nd, 3rd, 4th or 5th gear at an engine speed of 2400–2000 min-1 at least 3 s;
- checking for fault codes and, if necessary, troubleshooting;
- erasing codes.
The coolant temperature sensor is installed at the end of the cylinder head on the side of the 1st cylinder.
The sensor is an NTC thermistor: the electrical resistance of the sensor decreases with increasing temperature. The ECU processes the sensor signal and sets the optimal enrichment of the working mixture when the engine warms up.
You will need: key «at 21», flat blade screwdriver, tester, thermometer.
1. Disconnect the wire from the terminal «minus» battery.
2. Drain the coolant (see «Coolant replacement»).
3. Press the lock with a screwdriver...
4.... and disconnect the wiring harness connector from the coolant temperature sensor.
5. Loosen the sensor tightening with a wrench and unscrew it by hand.
6. Install the parts in the reverse order of removal.
7. Fill in coolant.
The throttle position sensor is a potentiometer that is mounted on the throttle shaft. The rotation of the damper axis causes a change in the voltage of the sensor signal, by which the ECU determines the degree of throttle opening.
If the engine is idling or acceleration dynamics deteriorate, check the sensor and its connector.
You will need: TORX T20 key, tester.
1. Disconnect the wire from the terminal «minus» battery.
2. Remove the air filter (see «Removal and installation of the air filter»).
3. Wring out a clamp and disconnect a block of a plait of wires from the gauge.
4. Connect the tester in resistance measurement mode to the terminals «IN» and «WITH» sensor.
5. Measure the resistance at the sensor terminals with the throttle fully closed. It should be 2.3-2.4 kOhm.
6. Turn the throttle by hand until it is fully open and measure the resistance again. It should be 1.3-1.4 kOhm.
7. To replace the sensor, unscrew the two bolts of its fastening (for clarity shown on the removed throttle assembly)...
8.... and remove the throttle position sensor.
9. Install the parts in the reverse order of removal.
Absolute pressure sensor (rarefaction) in the intake pipe mounted on the intake pipe. The sensor captures the change in pressure (rarefaction) in the intake pipe depending on the change in load and engine speed and converts them into an output signal voltage. Depending on the sensor signal, the ECU calculates the amount of air entering the engine.
1. Disconnect the wire from the terminal «minus» battery.
2. Press the latch...
3.... and disconnect the wiring harness block from the sensor.
4. Carefully remove the absolute pressure sensor, overcoming the resistance of the rubber sealing rings (the sensor fitting is installed with an interference fit in the inlet pipe opening).
5. Install the sensor in the reverse order of removal.
The air temperature sensor in the intake pipe is installed on the intake pipe next to the throttle assembly. The sensor is an NTC thermistor: the electrical resistance of the sensor decreases with increasing temperature. Based on the air temperature information from the sensor, the electronic control unit regulates the amount of fuel injected.
You will need a flat blade screwdriver.
1. Disconnect the wire from the terminal «minus» battery.
2. Remove the air filter (see «Removal and installation of the air filter»).
3. Disconnect the wiring harness block from the sensor by squeezing the spring clip with your fingers.
4. Pry with a screwdriver...
5.... and remove the sensor.
6. Install the sensor in the reverse order of removal.
A knock sensor attached to the cylinder block between cylinders 2 and 3 detects abnormal vibrations (detonation strikes) in the engine.
It is more convenient to carry out the work of replacing the sensor on a car mounted on a lift, since access to the sensor from above is very difficult.
You will need a key «at 24».
1. Disconnect the wire from the terminal «minus» battery.
2. Squeeze the latch and disconnect the wiring harness block from the sensor.
3. Remove knock sensor...
4....and remove it.
5. Install the parts in the reverse order of removal.
Oxygen concentration sensor (Lambda probe) installed on the exhaust manifold. On some vehicles, a second sensor is installed behind the catalytic converter. The sensor measures the oxygen content in the exhaust gases and converts the measured value into a signal voltage that is supplied to the engine electronic control unit. Using the sensor signals, the ECU controls the fuel injection in such a way as to obtain the calculated composition of the air-fuel mixture.
If the oxygen concentration sensor is defective, the toxicity of the exhaust gases may increase dramatically.
You will need: keys «on 10», «at 22».
1. Disconnect the wire from the terminal «minus» battery.
2. Press the latch...
3.... and disconnect the wiring harness block.
4. Remove the block from the bracket by sliding it forward.
5. Turn away three nuts...
6.... and remove the thermal screen.
7. Remove the wire from the holder.
8. Loosen...
9.... and unscrew the sensor from the exhaust manifold.
10. Install the sensor in the reverse order of removal.
The vehicle speed sensor is mounted on the gearbox and is a Hall effect sensor. It sends a pulse signal to the electronic engine control unit proportional to the speed of the drive wheels.
1. To replace the speed sensor, disconnect the wire from the terminal «minus» battery.
2. Press the latch...
3.... and disconnect the wiring harness connector from the speed sensor.
4. Gently pry off the sensor with a screwdriver...
5.... and remove it from the gearbox housing.
6. Install the speed sensor in the reverse order of removal.