Circuit Description
The camshaft position (CMP) sensor produces a 6X plus a sync signal for each revolution of the camshaft. These signals are for control of sequential fuel injection and for exhaust camshaft phaser control. The CMP is connected directly to the powertrain control module (PCM) and consists of the following circuits:
| • | 12-volt reference |
| • | Low reference |
| • | CMP sensor signal |
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 malfunction indicator lamp (MIL) will illuminate after 2 consecutive ignition cycles in which the diagnostic runs with the malfunction present. |
| • | The PCM will record the operating conditions at the time that the diagnostic fails. The Freeze Frame and Failure Records buffers will store this information. |
| • | A history DTC stores. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF after 3 consecutive ignition cycles in which the diagnostic runs without a fault. |
| • | A history DTC will clear after 40 consecutive warm up cycles without a fault. |
| • | A scan tool can clear the DTCs. |
Diagnostic Aids
| • | If the PCM sees 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 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 a 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. When a faulty electrical connection is present, the CMP Reference Activity counter will stop incrementing and the CMP Resync Counter will increment.
Step | Action | Value(s) | 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 | |||||||||
5 |
Does the DMM display a Hertz reading above the specified value? | 0 Hz | Go to Step 6 | Go to Step 7 | ||||||||
6 | Inspect the CMP sensor harness for incorrect routing at the following locations or shorted to another circuit that generates frequency:
Did you locate and correct the condition? | -- | Go to Step 11 | Go to Step 9 | ||||||||
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | |||||||||
8 | Replace the camshaft position (CMP) sensor. Refer to the Camshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||
9 |
Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||||
10 | Replace the PCM. Refer to Powertrain Control Module Programming . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||
11 |
Does the DTC run and pass? | -- | Go to Step 12 | Go to Step 2 | ||||||||
12 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||||
