Cam angle sensor

1. Disconnect the injection wiring and move it aside.

The disc is fitted with a pin which allows the sensor to signal the engine stroke position. The injection ECU uses the signal to acknowledge TDCs at the end of compression stroke.

1. Disconnect the engine coolant sensor electrical connection.
2. Loosen and remove the engine coolant sensor from the thermostat cup.

CAM ANGLE SENSOR

This Hall effect sensor is fitted on the right-hand cylinder head and faces the disc on the right-hand cylinder head rear exhaust side.

Operation

A semiconductor layer is crossed by current and submerged in a normal magnetic field (perpendicular force lines with respect to the current) generates a potential difference at the poles called "Hall" voltage. When disc (1) revolves, pin (3) crosses sensor (2) and blocks the magnetic field. This generates a low output signal. On the other hand, when sensor (2) reads the pin (3), the output signal is up. Consequently, the up signal alternates with the down signal once every two engine revolutions, precisely when cylinder 1 is 58° before TDC.