1. Camshaft Position Sensor Circuit Malfunction:
The camshaft position sensor monitors the position of the camshaft and provides this information to the engine control unit (ECU). A code P1390 is triggered when the ECU detects an issue in the circuit related to this sensor.
2. Diagnosing the Issue:
- Check the wiring harness and connectors: Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace any damaged components if necessary.
- Test the camshaft position sensor: Disconnect the camshaft position sensor and use a multimeter to test its resistance. Compare the reading with the manufacturer's specifications to determine if the sensor is faulty.
- Check the timing belt: If the camshaft position sensor and wiring are functional, inspect the timing belt. If the timing belt is misaligned or damaged, it can cause the camshaft position sensor to provide incorrect readings.
3. Fixing the Problem:
Once the cause of the code is identified, the appropriate repair can be performed. Here are the potential fixes:
- Repair the wiring harness: Repair any damaged or loose wiring in the camshaft position sensor circuit.
- Replace the camshaft position sensor: If the sensor is faulty, replace it with a new one.
- Adjust the timing belt: If the timing belt is causing the issue, adjust or replace it as needed.
4. Clearing the Code:
After the repair is completed, clear the P1390 code using a scan tool. This will reset the ECU and allow it to relearn the camshaft position sensor's readings.
It's important to note that this information is based on general diagnostic steps. The specific procedures may vary depending on your vehicle's exact make and model. If you are unsure about any of the steps, it's best to consult a qualified mechanic or refer to the service manual for your Dodge Neon.
