P1345 Explained

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P1345 Explained

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Blazer >> Mechanical & Maintenance >> Do-It-Yourself >> P1345 Explained

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P1345 Explained - 3/18/2008 4:17:20 PM

swartlkk

Posts: 13748
Joined: 5/1/2005
From: Waterloo, NY
Status: online

P1345

Schematic

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 Vehicle Control Module (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 position relative to the crankshaft position sensor pulse.

ACTION TAKEN WHEN THE DTC SETS

   * The control module illuminates the Malfunction Indicator Lamp (MIL) if a failure is detected during 2 consecutive key cycles.
   * The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool Freeze Frame and Failure Records.

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 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 inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for intermittent and Poor Connections in Diagrams.

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

Diagnostic Chart

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.

_____________________________

Kyle-