Circuit Description
This DTC determines if the distributor is installed incorrectly, or if there is a mechanical malfunction in the engine. The DTC P1345 is a type A DTC.
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. |
| • | The CAM and the crank signals are out of sync by more than 30° relative to the crankshaft position. |
| • | The above conditions are present for 30 out of 50 complete revolutions of the crankshaft. |
Action Taken When The DTC Sets
| • | The VCM turns the MIL ON 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 driving trips without a fault condition present. A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (the coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle) or the scan tool clearing feature has been used.
Diagnostic Aids
Check the following items:
| • | A loose or missing distributor hold down bolt |
| • | A loose CMP sensor causing a variance in the sensor signal |
| • | Incorrectly installed distributor - 1 tooth off in either advanced or retard positions |
| • | A loose distributor rotor on the distributor shaft |
| • | Excessive free play in the timing chain and gear assembly |
Test Description
The numbers below refer to the step numbers in the table.
-
This test will determine if the DTC is intermittent.
-
If there is a variance in the camshaft sensor signal it will be detected in this step.
-
If excessive pressure is used when performing this test unintentional damage to the distributor shaft could result.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool to record the Freeze Frame and the Failure Records for reference. This data will be lost when the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the engine RPM fluctuate (up to twice desired RPM)? | -- | ||
3 | Replace the Crankshaft sensor. Refer to Crankshaft Position Sensor Replacement . Is the action complete? | -- | -- | |
Perform the Camshaft Retard Offset test procedure as follows:
Important: The camshaft retard reading will not be accurate below 1000 RPM. Is the camshaft retard reading within the second specified value? | 1000 RPM -5°--17° | |||
Does the camshaft retard reading change more than the second specified value? | 2000 RPM 2° | Go to Diagnostic Aids | ||
With the engine at operating temperature perform the following procedure:
Does the rotor turn on the distributor shaft? | -- | |||
7 | Check for proper installation of the Distributor. Repair as necessary. Was a problem found? | -- | Go to Diagnostic Aids | |
8 | Replace the distributor. Is the action complete? | -- | -- | |
9 |
Does the scan tool indicate that this diagnostic ran and passed? | -- | ||
10 | Using the scan tool, select the Capture Info and the Review Info. Are any DTCs displayed that have not been diagnosed? | -- | Go to The Applicable DTC Table | System OK |
