The P0340 code is a generic OBD-II trouble code that indicates a failure with the camshaft position sensor (CMP) circuit. The CMP sensor provides cylinder identification and timing information for the engine control unit (ECU). The ECU uses this information to control ignition timing and fuel injector pulse width. If the CMP sensor signal is missing or erratic, the ECU can not properly control ignition timing or fuel injector pulse width. This will result in poor engine performance and fuel economy. The P0340 code is often caused by a faulty CMP sensor, but it can also be caused by a faulty ECU, wiring harness, or camshaft position sensor connector.
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1. Check the wiring to the Camshaft Position Sensor
- Remove the intake manifold.
- Remove the camshaft cover.
- Remove the camshaft.
- Inspect the camshaft position sensor connector for damage or poor electrical connection. If the connector is damaged, replace the sensor. If the connector is good, inspect the wiring for damage. If there is damage, replace the wiring.
- Replace the camshaft position sensor.
2. Replace the Camshaft Position Sensor
- Park the car in a level spot.
- Remove the air cleaner cover.
- Disconnect the vacuum hose from the CAV sensor.
- Remove the two bolts that hold the camshaft position sensor bracket to the camshaft.
- Remove the sensor.
- Clean the sensor and the bracket with a cloth and clean oil.
- Install the new sensor in the bracket and secure it with the bolts.
- reconnect the vacuum hose to the CAV sensor.
- Replace the air cleaner cover.
3. Check for loose or damaged connectors
- Remove the connectors from the affected area.
- Inspect the connectors for any damage.
- If the connectors are damaged, replace them with new ones.
4. Check for engine oil contamination
- Remove the oil filter.
- Check the oil level. If it is low, add oil.
- Check the oil filter. If it is dirty, replace it.
- Check the engine oil for contamination. If it is contaminated, replace the engine oil.
5. Clean the Camshaft Position Sensor
Disconnect the negative battery cable. Remove the air cleaner box. Remove the camshaft position sensor. Remove the camshaft. Clean the camshaft position sensor. Install the camshaft. Connect the negative battery cable.