P0340
DTC P0340
CIRCUIT DESCRIPTION
The camshaft position (CMP) sensor is a 1X sensor. The CMP sensor provides one digital ON/OFF signal to the powertrain control module (PCM) per revolution of the camshaft. This information is used by the PCM to determine the position of the valve train relative to the crankshaft position (CKP). By monitoring the CMP and CKP signals, the PCM can accurately time the operation of the fuel injectors. The PCM supplies 12 volts to the sensor on the 12-volt reference circuit and provides a ground on the low reference circuit. The CMP sensor provides signals to the PCM on the CMP sensor signal circuit. The PCM monitors the CMP sensor for errors. If the PCM does not receive a signal from the CMP sensor, DTC P0340 sets.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0340 Camshaft Position (CMP) Sensor Circuit
CONDITIONS FOR RUNNING THE DTC
- The engine is cranking or running.
- This diagnostic runs continuously once the above condition is met.
CONDITIONS FOR SETTING THE DTC
The PCM detects that the engine has been cranking for more than 10 seconds without a CMP sensor signal.
OR
The PCM detects that when the engine is running, more than 6 CKP sensor low resolution reference signals, generated by the PCM, have occurred for every one CMP sensor signal.
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 ignition control (IC) module-Inspect the ignition coils for cracks, carbon tracking, or 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 Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
TEST
Step 1 - Step 9:
Step 10 - Step 19:
