Camshaft Position Sensor -G40-, Checking

Function

Using the signal from the Camshaft Position Sensor -G40-, the precise position of the camshaft relative to the crankshaft is determined very quickly when the engine is started. Used in combination with the signal from the Engine Speed Sensor -G28-, the signal from the Camshaft Position Sensor -G40- allow to detect which cylinder is at TDC. The fuel can be injected into the corresponding cylinder and ignited. In case of signal failure, the signal from the Engine Speed Sensor -G28- is used instead. Because the camshaft position and the cylinder position cannot be recognized as quickly, it may take longer to start the engine.

Special Tools And Workshop Equipment Required 

• Multimeter
• Wiring Diagram
• Scan Tool

Test requirements

• Fuses OK.
• Battery voltage OK
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
• Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Coolant Temperature: ≥ 80 °C.
• Observe all safety precautions: SAFETY PRECAUTIONS
• View clean working conditions: CLEAN WORKING CONDITIONS

Test Procedure