P0341

DTC P0341

CIRCUIT DESCRIPTION
The camshaft position (CMP) sensor works in conjunction with the 4X reluctor trigger wheel on the camshaft gear. The reluctor trigger wheel on the camshaft gear contains a pattern around the circumference, consisting of 2 narrow teeth and 2 wide teeth. The engine control module (ECM) provides a 5-Volt reference to the sensor, as well as a low reference and a signal circuit. As the camshaft gear rotates, the reluctor trigger wheel interrupts a magnetic field produced by a magnet internal to the sensor. The CMP sensor internal circuitry detects this interruption of the magnetic field, and produces an ON/OFF DC voltage of varying frequency. The frequency of the CMP sensor output signal is dependent upon camshaft speed. The ECM will recognize the narrow and wide tooth patterns to identify camshaft position, or which cylinder is in compression and which is in exhaust. If the ECM detects that the ratio of the CMP sensor to crankshaft position (CKP) sensor trigger pulses are missing or incorrect, then DTC P0341 will set.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0341 Camshaft Position (CMP) Sensor Performance

CONDITIONS FOR RUNNING THE DTC
- The engine is cranking, or the engine is running.
- DTCs P0335, P0336, and P0340 are not set.
- DTC P0341 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC
The ECM detects a missing or a noisy CMP sensor signal for 100 engine cycles.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores the information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the 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.

TEST DESCRIPTION

Step 1 - Step 9:

Step 10 - Step 11:

The numbers below refer to the step numbers on the diagnostic table.
4. This step inspects for electromagnetic interference (EMI) on the CMP circuits.
7. Damage to the face of the sensor could indicate material passing between the CMP sensor and the reluctor wheel. This condition could cause this DTC to set. Damage to the reluctor wheel would affect the CMP sensor output signal.