The phase sensor signal is used by the controller to organise sequential fuel injection in accordance with the engine cylinder firing order.
The phase sensor is installed on a boss of the cylinder head.
The operating principle of the sensor is based on the Hall effect.
There is a special pin on the engine camshaft.
When the pin passes opposite the end face of the sensor, the sensor sends a low-level voltage pulse (about 0 V) to the controller, which corresponds to the position of the No. 1 cylinder piston in the compression stroke.
If a fault occurs in the circuits or in the phase sensor itself, the controller stores its code in its memory and switches on the warning lamp.
The vehicle self-diagnosis may not detect the error.
The vehicle engine will then start poorly, especially after a long period of parking.
The «CHECK ENGINE» warning lamp will be on.
Removal of the phase sensor
- Switch off the ignition.
- Disconnect the harness connector from the sensor.
- Using a 10 spanner, unscrew the phase sensor fastening bolt and remove the phase sensor.
Testing the camshaft sensor
To test the phase sensor, we remove it and connect the wiring harness connector to the sensor.
On the side where the wires enter the connector, we insert two lengths of wire into its sockets corresponding to the outer terminals so that contact appears between them and the wire tips.
We connect the tester probes to the lengths of wire.
After switching on the ignition, we bring a steel rod up to the end face of the sensor several times.
In this case, with a serviceable sensor, the instrument must register abruptly changing voltage values.
To test the sensor, a simple circuit can be assembled.
Connect the sensor and bring the screwdriver shaft up to the working part of the sensor.
The lamp or LED must light up when brought up to the working part of the sensor.
Installation of the phase sensor
- Before installing the sensor, lubricate the surface of the phase sensor sealing ring with engine oil.
- Install the phase sensor on the cylinder head, screw in and tighten the fastening bolt. Bolt tightening torque: 3.8…8.2 N·m.
- Connect the harness connector to the sensor.
