G424F(FE) Service Manual Chapter 5. Engine Management System (EMS) 163
Camshaft Position Sensor
(G424FE- Dual Fuel Only)
Component Location
Description
The Camshaft Position Sensor (CMPS) is a sensor
that detects the compression TDC of the NO.1
cylinder.
The CMPS consists of a hall type sensor and a
target on the end of the in take camshaft.
When the target triggers the sensor, the sensor
voltage is 5V. If not, the sensor voltage is 0V.
These CMPS signal is sent to the ECM and the
ECM uses the CMPS signal for synchronizing the
firing of sequential fuel injectors.
Schematic Diagram
Sensor Inspection
123
1. Turn ignition switch to OFF position and then
disconnect CMPS connector.
2. Remove the CMPS from the engine.
3. Turn ignition switch to ON position.
4. Apply battery voltage to the terminal 1 and ground
terminal 3 of CMPS as shown in the figure.
5. Install a LED between +5V power and CMPS
terminal 2, and then set a steel wheel (or anything
made of steel; hammer, wrench, bolt and nut etc.)
at the CMPS’s tip.
6. Rotate the steel wheel slowly and check if the
LED flashes light.
• If the LED blinks, the CMPS works normally.
Removal
1. Disconnect the negative battery cable.
2. Disconnect the CMP sensor electrical connector.
3. Remove harness clamp from CMP sensor
support plate.
4. Remove the screw and lock washer retaining
the CMP sensor.
5. Remove the CMP sensor and O-ring.
6. Remove O-ring from CMP sensor and discard.
CAM shaft Position Sensor
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