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P1345 SGC (Cam Position) Sensor Circuit Malfunction/ Crankshaft Position - Camshaft Position Correlation

The OBD2 code P1345 SGC indicates a malfunction in the camshaft position sensor circuit, specifically relating to a correlation issue between the crankshaft and camshaft positions, which can affect engine timing and...

Definition

The OBD2 code P1345 SGC indicates a malfunction in the camshaft position sensor circuit, specifically relating to a correlation issue between the crankshaft and camshaft positions, which can affect engine timing and performance

Common causes

  • Faulty camshaft position sensor
  • Faulty crankshaft position sensor
  • Timing belt/chain misalignment
  • Damaged wiring or connectors
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Oil contamination or sludge affecting sensor operation
  • Mechanical issues with the camshaft or crankshaft
  • Incorrectly installed or damaged timing components

Common misdiagnoses

  • Faulty camshaft position sensor
  • Faulty crankshaft position sensor
  • Timing belt/chain issues
  • Engine control module (ECM) failure
  • Wiring or connector issues
  • Ignition system problems
  • Fuel system issues
  • Vacuum leaks
  • Valve timing problems
  • Oil flow issues to the VVT system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors associated with the camshaft position sensor and crankshaft position sensor for any signs of damage, corrosion, or loose connections

  3. 3. Repair or Replace

    Repair any damaged wires or connectors, and ensure all connections are secure

  4. 4. Test the Camshaft Position Sensor

    Resistance Test: Use a multimeter to check the resistance of the camshaft position sensor. Compare the readings to the manufacturer’s specifications

  5. 5. Voltage Test

    Check the voltage supply to the sensor with the ignition on. Ensure it is within the specified range

  6. 6. Signal Test

    Use an oscilloscope or a multimeter to check the signal output from the sensor while the engine is running

  7. 7. Test the Crankshaft Position Sensor

    Similar to the camshaft position sensor, perform resistance, voltage, and signal tests on the crankshaft position sensor to ensure it is functioning correctly

  8. 8. Check Timing Components

    Timing Belt/Chain: Inspect the timing belt or chain for wear, damage, or misalignment. A stretched or broken timing belt can cause a loss of synchronization between the crankshaft and camshaft

  9. 9. Timing Marks

    Verify that the timing marks on the crankshaft and camshaft align correctly according to the manufacturer’s specifications

  10. 10. Inspect Engine Mechanical Condition

    Check for any mechanical issues that could affect timing, such as a worn timing chain or belt, or issues with the camshaft or crankshaft

  11. 11. Check Engine Control Module (ECM)

    If all sensors and mechanical components are functioning correctly, consider checking the ECM for faults. A malfunctioning ECM can lead to incorrect readings and codes

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P1345 code