11 No Crank Reference Signal at PCM

11 NO CRANK REFERENCE SIGNAL AT PCM




The Crankshaft Position (CKP) sensor, located on the engine block just above the oil filter, is a Hall-effect sensor that provides a voltage signal to the Powertrain Control Module (PCM) at pin 25. Voltage alternates between 0 and 5 volts as the crank turns. The PCM supplies 9 volts to the sensor through pin 44, and a sensor ground at pin 51 (fig. 18).

ENABLING CONDITIONS
This DTC can be enabled in one of the two methods listed below:

1. No crank pulses detected after the battery has been disconnected
2. During cranking, the Camshaft Position (CMP) sensor indicates that the camshaft is rotating, and there are no pulses from the CKP sensor

No CKP sensor edges detected for 5 seconds during one of the two conditions causes the PCM to store the DTC in its memory. The test is run during start-up, and the engine will not operate without a signal from the crank position sensor.

The MIL is not illuminated, because an engine that does not run does not produce any emissions.

This malfunction could possibly be caused by problems with any of the following components:

- CKP sensor
- Related wiring and connectors for the CKP sensor (Open or short circuit)
- PCM
- Crankshaft tone wheel