Circuit Description
The engine control module (ECM) 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 ECM within a narrow time window, the ECM will determine that an error has occurred and DTC P1345 will set.
Conditions for Running the DTC
The engine is cranking or running.
Conditions for Setting the DTC
When the engine is cranking or running, the cam sensor pulses received by the ECM do not equal 3 or 0 per 2 crankshaft revolutions.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | 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 non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Diagnostic Aids
Inspect for the following items:
| • | A loose CMP sensor causing a variance in the sensor signal |
| • | Excessive free play or damage of the timing gears |
| • | The Camshaft Reference Signal Missed parameter will only increment for an intermittent. A constant failure of the CMP sensor will not cause the parameter to increment, but will set DTC P0340. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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A condition that sets one of these DTCs may also result in a DTC P1345. Diagnose these codes before continuing with this diagnostic.
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A loose CMP sensor may result in a DTC P1345. Attempt to tighten the sensor to proper torque specifications. If unable to prevent CMP sensor movement, inspect the cover for damage before replacing the sensor.
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A cracked CMP sensor or internal breakage could result in DTC P1345. This will not be apparent unless the sensor is removed from the front engine cover.
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If the CMP sensor appears to be damaged by contact with the camshaft gear, you may need to remove the front engine cover and inspect for excessive camshaft end-play.
Step | Action | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views | |||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |||||||||
2 |
Does the DTC fail this ignition? | Go to Step 3 | Go to Intermittent Conditions | ||||||||
If one or more of the following DTCs set, go to the appropriate table and diagnose that DTC first:
Did any of the DTCs set? | Go to Step 4 | ||||||||||
Inspect for a loose CMP sensor. If the sensor cannot be tightened, the sensor must be replaced. Does the CMP sensor move without being able to be tightened? | Go to Step 7 | Go to Step 5 | |||||||||
Does the CMP sensor show any signs of physical damage? | Go to Step 7 | Go to Step 6 | |||||||||
Did you find and correct the condition? | Go to Step 8 | Go to Symptoms - Engine Mechanical in Engine Mechanical - 6.6L | |||||||||
7 | Replace the CMP sensor. Refer to Camshaft Position Sensor Replacement . Did you complete the replacement? | Go to Step 8 | -- | ||||||||
8 |
Did the DTC fail this ignition? | Go to Step 9 | Go to Step 2 | ||||||||
9 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | System OK | |||||||||
