P0340
DTC P0340
Circuit Description
The camshaft position (CMP) sensor produces a 6X plus a sync signal for each revolution of the exhaust camshaft. These signals are for control of sequential fuel injection and for exhaust camshaft phaser control. The CMP is connected directly to the powertrain control module (PCM) and consists of the following circuits:
- 12-volt reference
- Low reference
- CMP sensor signal
If the CMP Active Counter stops incrementing diagnostic trouble code (DTC) P0340 will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The CMP Active Counter is not incrementing.
Action Taken When the DTC Sets
- The malfunction indicator lamp (MIL) will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.
- The PCM records the operating conditions at the time when the diagnostic fails. This information stores in the Freeze Frame and Failure Records buffers.
- A history DTC stores.
Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm-up cycles without a fault.
- Use a scan tool to clear the DTCs.
Diagnostic Aids
- Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter resets to 0. When a poor connection is present, the cam sensor active counter stops incrementing and the cam sensor resync counter starts to increment.
The following conditions may cause this DTC to set:
- Damage to the camshaft reluctor wheel
- Damage to the CMP sensor
- The sensor coming in contact with the reluctor wheel
- Foreign material passing between the sensor and the reluctor wheel
- If the condition is intermittent, refer to Intermittent Conditions.
Test Description
The number below refers to the step number on the diagnostic table.
6 This step tests the output of the CMP sensor. If the duty cycle is not within the specified range the sensor is bad.
Step 1 - 2:
Step 3 - 5:
Step 6 - 10:
