P0341

DTC P0341 Camshaft Position (CMP) Sensor Performance




Circuit Description
The camshaft position (CMP) sensor is a sensor designed to detect changes in a magnetic field. The control module (PCM/VCM) supplies the CMP sensor with signal and ground circuits. Ignition voltage is supplied to the CMP sensor by an independent circuit. The CMP sensor produces a magnetic field whenever the ignition is ON. The CMP sensor is mounted near a reluctor wheel that is attached to the distributor shaft. When the distributor shaft rotates (the engine is cranking or running) the reluctor wheel changes the magnetic field. The CMP sensor converts each change in the magnetic field into a PULSE. The number of teeth on the reluctor wheel determines how many pulses the CMP sensor detects per camshaft rotation. The control module uses the CMP sensor signal in order to calculate the correct timing for sequential fuel injection.

If the VCM detects that the CMP signal is not synchronized with the CKP sensor signal, this DTC will be set.

Conditions for Running the DTC
The engine is running.

Conditions for Setting the DTC
The CMP sensor reference pulse is not detected at the correct time interval once every two crankshaft revolutions.

Action Taken When the DTC Sets
- The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
- The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool's Freeze Frame and Failure Records.

Conditions for Clearing the MIL/DTC
- The control module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed
- A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm up cycle occurs when the coolant temperature has risen 22° C (40° F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70° C (158° F) during the same ignition cycle.
- Use the scan tool Clear Information function

Diagnostic Aids
Refer to Symptoms.
An intermittent may be caused by any of the following conditions:
- A poor connection
- Rubbed through wire insulation
- A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs.

Steps 1 - 3:

Steps 4 - 6:

Steps 7 - 8:

Test Description
The step numbers below refer to the step numbers in the diagnostic table.
2. Complete diagnosing all other DTCs before performing this diagnostic.
3. This step checks for an electromagnetic interference caused by improper harness routing.