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.
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 or DTC
| • | The control module 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. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle. |
| • | Use a scan tool in order to clear the DTCs. |
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 in order to record the Freeze Frame and the Failure Records for reference. This data will be lost when the Clear DTC Information is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the engine RPM fluctuate (up to twice the desired RPM)? | -- | ||
3 | Replace the Crankshaft sensor. Refer to Crankshaft Position (CKP) 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 | ||
Does the rotor turn on the distributor shaft? | -- | |||
7 | Check for proper installation of the distributor. Refer to Distributor Installation Procedure in Engine Mechanical. Was a problem found? | -- | Go to Diagnostic Aids | |
8 | Replace the distributor. Refer to Distributor Removal Procedure in Engine Mechanical. Is the action complete? | -- | -- | |
9 |
Does the scan tool indicate that this diagnostic ran and passed? | -- | ||
10 | Use the scan tool in order to display the Capture Info and the Review Capture Info Functions. Are there any DTCs displayed that have not been diagnosed? | -- | Go to the applicable DTC table | System OK |
