Checking The Component And Wiring

Check the engine speed (RPM) sensor connector. Check for intermittent contact resistance and oxidation.

HINT: The engine speed (RPM) sensor and its wiring are sensitive to interference from surrounding cables, the starter motor cable for example, or similar high amperage cables. 

Interference can cause difficulty in starting the engine, the engine does not start at all, intermittent operation of the tachometer, etc.

Check whether any cable with high power consumption is incorrectly installed, i. e. it is too close to the engine speed (RPM) sensor or its wiring.

Remedy as necessary.

Other information 

• see CRANKSHAFT POSITION SENSOR (CKP)

Fig 1: Detecting The Reference Positions Of The Camshaft

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to VERIFICATION