Circuit Description
The camshaft position (CMP) sensor indicates the camshaft position so that the powertrain control module (PCM) can determine which cylinder is misfiring when a misfire is present. Whenever the PCM receives an intermittent signal from the CMP, then the CMP resync counter will increment. In order to set a diagnostic trouble code (DTC), the PCM must receive a minimum number of resyncs within a calculated time.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM receives more than 15 CMP sensor resyncs in 256 seconds (4 minutes, 16 seconds).
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | 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 emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
If the PCM receives less than 15 resyncs in 256 seconds, the counter is reset to 0. When a faulty electrical connection is present, the CMP reference activity counter will stop incrementing and the CMP resync counter will increment.
If the condition is intermittent, refer to Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step determines if DTC P0341 is the result of a hard malfunction or an intermittent condition.
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The counter should stop incrementing with the sensor electrical connector disconnected and set DTC P0340. If the counter still increments, this indicates that the PCM is malfunctioning.
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A poor electrical connection in any of the circuits at the CMP sensor will cause the CMP resync counter to increment. Any time a faulty electrical connection is present, the CMP reference activity counter will stop incrementing and the CMP resync counter will increment.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Controls Schematics | |||
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |
2 |
Are any other DTCs set? | Go to Step 3 | |
Is the CMP Resync Counter incrementing? | Go to Step 4 | Go to Diagnostic Aids | |
Did the CMP Resync Counter stop incrementing? | Go to Step 5 | Go to Step 6 | |
Did you find and correct the condition? | Go to Step 9 | Go to Step 6 | |
6 | Replace the camshaft position (CMP) sensor. Refer to the Camshaft Position Sensor Replacement . Did you complete the replacement? | Go to Step 9 | -- |
7 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
8 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | Go to Step 9 | -- |
9 |
Does the DTC run and pass? | Go to Step 10 | Go to Step 2 |
10 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | System OK | |
