P1345

DTC P1345 CKP/CMP Correlation




Circuit Description
This DTC monitors the CKP and CMP signals to determine if they are synchronized. If both signals are not observed by the VCM within a narrow time window, the VCM will determine that an error has occurred.

Conditions for Running the DTC
The engine is running

Conditions for Setting the DTC
When the engine is running, the cam sensor reference pulse is not detected at the correct relative position to the crankshaft position sensor pulse.

Action Taken When the DTC Sets
- The VCM illuminates the MIL when this DTC is reported and one failure has occurred.
- The VCM records the operating conditions at the time the Diagnostic Fails. Freeze Frame and Failure Records store this information.

Conditions for Clearing the MIL/DTC
- The VCM turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22 °C (40 °F) from the startup coolant temperature and the engine coolant temperature is more than 70 °C (158 °F) during the same ignition cycle).
- Use the scan tool Clear Information function.

Diagnostic Aids
The check following items:
- A loose CMP sensor causing a variance in the sensor signal
- Excessive free play in the timing chain and gear assembly
- Incorrectly installed distributor - 1 tooth OFF in either advance or retard positions
- A loose distributor rotor on the distributor shaft
- A loose or missing distributor hold down bolt

An intermittent may be caused by any of the following conditions:
- A poor connection
- Rubbed through wire insulation
- A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis.

If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.

Steps 1 - 3:

Steps 4 - 7:

Steps 8 - 10:

Test Description
The numbers below refer to the step numbers on the table.
4. This test will determine if this DTC is intermittent.
5. If there is a variance in the camshaft sensor signal it will be detected in this step.
6. Unintentional damage to the distributor shaft may result if excessive pressure is used to rotate the distributor.