Circuit Description
The camshaft position (CMP) sensor correlates the crankshaft to CMP so that the powertrain control module (PCM) can determine which cylinder is ready to be fueled by the injector. The CMP sensor also determines which cylinder is misfiring when a misfire is present. If the PCM receives an intermittent signal from the CMP, then the CMP Resync Counter will increment. When the PCM cannot use the information from the CMP sensor, a DTC is set and the PCM will fuel the engine by using the alternating synchronous double fire (ASDF) method.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM sees 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 sees less than 15 resyncs in 256 seconds, the counter is reset to 0. Any time a faulty electrical connection is present, the CMP Reference Activity Counter will stop incrementing and the CMP Resync Counter will increment.
If this DTC is determined to be 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 the 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 stills increments, this indicates that the PCM is malfunctioning.
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A faulty 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 7 | |
Did you find and correct the condition? | Go to Step 9 | Go to Step 6 | |
6 | Replace the CMP sensor. Refer to 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 Programming . 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 | |
