P0340
DTC P0340CIRCUIT DESCRIPTION
The camshaft position (CMP) sensor consists of a 12-volt reference circuit, a low reference circuit, and a signal circuit. The powertrain control module (PCM) constantly monitors the number of pulses on the CMP signal circuit. If the PCM receives an incorrect number of pulses on the CMP signal circuit, DTC P0340 will set.
CONDITIONS FOR RUNNING THE DTC
The engine is running.
CONDITIONS FOR SETTING THE DTC
The camshaft position (CMP) sensor reference pulse is not detected during every engine revolution.
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
The following conditions may cause this DTC to set:
- Incorrect harness routing near secondary ignition components
- Ignition coil arcing to wiring harness or IC module - Inspect the ignition coils for cracks, for carbon tracking, or for other signs of damage.
- Camshaft reluctor wheel damage
- The sensor coming in contact with the reluctor wheel
- Foreign material passing between the sensor and the reluctor wheel
- Excessive camshaft end-play
If the condition is intermittent, refer to Intermittent Conditions. Diagnostic Strategies
TEST
Steps 1 - 5:
Steps 6 - 8:
Steps 9 - 13:
Steps 14 -17:
