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, prevent the engine starting at all, or cause intermittent operation of the tachometer, etc.

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

Remedy as necessary

Other information
- For B5xx4T, see REPLACING THE ENGINE SPEED (RPM) SENSOR
- For B6xx4T, see ENGINE SPEED (RPM) SENSOR, REPLACING .
Fig 1: Detecting The Reference Positions Of The Camshaft
Courtesy of VOLVO CARS CORPORATION

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Refer to VERIFICATION