P0341

DTC P0341

CIRCUIT DESCRIPTION
The camshaft position (CMP) sensor is installed on the cylinder head at the rear of the camshaft gear. The CMP sensor has the following circuits.
- 12 volts feed circuit
- CMP sensor signal circuit
- CMP sensor shield circuit

The engine control module (ECM) supplies 12 volts to the CMP sensor on the 12 volts feed circuit. The CMP sensor provides a signal to the ECM on the CMP signal circuit. The CMP sensor detects a total of five through holes (four holes arranged equally every 90° and one reference hole on the camshaft gear flange surface) and sends signals to the engine control module (ECM). Receiving these signals, the ECM determines cylinder #1 compression top dead center (TDC). If the ECM receives extra or missing CMP sensor signal pulses, this DTC will set.

Condition for Running the DTC
- DTC P0340 is not set.
- The battery voltage is between 10-16 volts.
- The engine speed is higher than 350 RPM.
- The CMP sensor signal is detected.

Condition for Setting the DTC
- The ECM detects extra or missing CMP sensor pulses during 100 engine rotations.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive driving cycle when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records on the second consecutive driving cycle when the diagnostic runs and fails.

Condition for Clearing the MIL/DTC
- The ECM turns OFF the MIL after 3 consecutive driving cycles when 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 after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
- An intermittent CMP sensor signal may set this DTC.
- Ensure the sensor is tight and the camshaft gear surface is not damaged.

If an intermittent condition is suspected, the following may cause an intermittent:
- Poor connections
- Misrouted harness
- Rubbed through wire insulation
- Broken wire inside the insulation

Check for the following conditions:
- Poor connection at the ECM: Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
- Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "Cam Signal Present" display on the scan tool with engine running while moving connectors and wiring harness. A change in the display will indicate the location of the fault.

DTC P0341
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

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