Bosch-Common Rail System – CKP sensor

CKP sensor installation position

1 Crankshaft vibration damper
2 CKP sensor

The CKP signal is a prerequisite for the calculation of injected quantity and injection timing. The CKP sensor works according to the Hall principle and scans a magnetic disc on the crankshaft timing pulley.

The CKP signal is used:
• to determine engine speed,
• to synchronize with the CMP signal,
• to determine the crankshaft position.

Effects of faults

If there is no signal, the engine cannot be started or cuts out.


The CKP sensor is checked for short circuit and open control loop. Moreover, a plausibility check is implemented, which monitors synchronization with the CMP signal.

Since the engine cuts out or cannot be started in the event of a fault, the CKP sensor has no effect on exhaust emissions. No additional monitoring measures relevant for EOBD have been implemented. Therefore, this is a non MIL active component. In the event of a fault, the engine system fault warning lamp is actuated.

Possible diagnostic trouble codes: P0335, P0336, P0339.

07. August 2018 by Ron
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