Circuit Description
This diagnostic trouble code (DTC) monitors the crankshaft position (CKP) and the camshaft position (CMP) signals to determine if they are synchronized. If both signals are not observed by the control module within a narrow time window, the powertrain control module (PCM) 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 pulse is not detected at the correct relative position to the crankshaft position sensor pulse.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
Check for the following items:
| • | A loose or missing distributor hold down bolt. |
| • | A loose CMP sensor causing a variance in the sensor signal. |
| • | An incorrectly installed distributor--1 tooth off in either advance or retard positions. |
| • | A loose distributor rotor on the distributor shaft. |
| • | Excessive free play in the timing chain and gear assembly. |
If an intermittent condition is suspected, refer to Intermittent Conditions .
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
2 |
Does the engine speed fluctuate (up to twice the desired RPM)? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace the crankshaft position sensor. Refer to Crankshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
4 |
Did you find a concern? | -- | Go to Step 6 | Go to Step 5 |
5 |
Does DTC P1345 set? | -- | Go to Step 8 | |
6 | Replace the distributor. Refer to Distributor Replacement . Did you complete the replacement? | -- | Go to Step 7 | -- |
7 |
Does the DTC run and pass? | -- | Go to Step 8 | Go to Step 2 |
8 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |
