Circuit Description
The camshaft position (CMP) sensor is a hall-effect type sensor that works in conjunction with a 1X reluctor wheel on the camshaft. The powertrain control module (PCM) provides the CMP sensor with the following circuits:
| • | A 12-volt reference |
| • | A low reference |
| • | A signal circuit |
The CMP sensor produces one signal for each revolution of the camshaft to control sequential fuel injection. Observe that as long as the PCM receives the CKP sensor signal, the engine will start and run without a CMP signal. If the PCM receives a minimum number of CMP resyncs within a calculated amount of time, DTC P0341 will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The PCM detects more than 15 CMP sensor resyncs in 256 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 detects less than 15 resyncs in 256 seconds, the counter is reset to 0. Anytime a faulty electrical connection is present, the CMP Reference Activity counter will stop incrementing and the CMP Resync Counter will increment.
The following conditions may cause this DTC to set:
| • | An incorrect harness routing near secondary ignition components |
| • | The ignition coil arcing to the wiring harnesses or the IC module--Inspect the ignition coils for cracks, for carbon tracking, or for other signs of damage. |
| • | High resistance on the low reference circuit |
| • | Any camshaft reluctor wheel damage |
| • | The sensor coming in contact with the reluctor wheel |
| • | Any foreign material passing between the sensor and the reluctor wheel |
| • | Excessive camshaft end-play |
If the condition is determined to be intermittent refer to Intermittent Conditions .
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain 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 | |||||||
Is the CMP Resync Counter incrementing? | -- | Go to Step 3 | Go to Diagnostic Aids | |||||||
Did the CMP Resync Counter stop incrementing? | -- | Go to Step 5 | Go to Step 4 | |||||||
4 |
Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 6 | ||||||
5 | Test for an intermittent and for a poor connection at the CMP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7 | ||||||
6 | Replace the PCM. Refer to Powertrain Control Module 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 CMP sensor. Refer to Camshaft Position Sensor Replacement . Did you complete the replacement? | -- | Go to Step 9 | -- | ||||||
9 |
Did the DTC fail this ignition? | -- | Go to Step 2 | Go to Step 10 | ||||||
10 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? | -- | System OK | |||||||
