Mechanics

GMC SIERRA DISTRIBUTOR PROBLEM

1998 GMC Sierra • 135,000 miles

How do I eliminate the p1345 code? I have set the timing by setting the #1 cylinder to tdc and set the distributor to #1 cylinder several times. Any ideas?
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Henryguilleniii
March 3, 2013.



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/DTC: The VOM 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 exceeds 70~C (160~F) during the same ignition cycle).

Use the scan tool Clear Information function.

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 advance 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 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. If excessive pressure is used when performing this test unintentional damage to the distributor shaft could result.
After you install the distributor, you need a scan tool to set the timing of the distributor. If you are off more than 2 degrees, the sync code will set

Roy