Posted in Mitsubishi Colt

P0340 – Camshaft Position Sensor System MMC Colt

 Posted by  Posted on September 26, 2020

OPERATION

  • Power is supplied to the camshaft position sensor (terminal No. 3) from the engine control relay (terminal No. 4) and is earthed to the engine-ECU (terminal No. 27) from the camshaft position sensor (terminal No. 1).
  • A power voltage of 5 V is applied to the camshaft position sensor output terminal (terminal No. 2) from the engine-ECU (terminal No. 12).

    • FUNCTION

  • The camshaft position sensor detects the top dead center on the compression stroke of the No. 1 cylinder and inputs a pulse signal to the engine-ECU.

    • TROUBLE JUDGMENT

  • Engine speed is 500 r/min or higher.
  • Camshaft position sensor output voltage has not been changed (no pulse signal is has been input) for 2 seconds.

    • PROBABLE CAUSES

  • Failed camshaft position sensor
  • Open or shorted camshaft position sensor circuit, harness damage, or connector damage
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-109 camshaft position sensor connector

    Q. Is the check result normal?

    STEP 2. Perform voltage measurement at A-109 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.

    • Q. Is the check result normal?

    STEP 3. Connector check: B-206 engine control relay connector

    Q. Is the check result normal?

  • Check power supply line for open/short circuit.

    • STEP 4. Perform voltage measurement at A-109 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 5. Perform voltage measurement at A-08 engine-ECU connector.

  • Disconnect engine-ECU connector and connect special tool power plant ECU check harness (MB991987), and then measure the voltage on the check connector.
  • Disconnect A-109 camshaft position sensor connector.
  • Ignition switch: ON
  • Voltage between terminal No. 12 and earth.

    • Q. Is the check result normal?

    STEP 6. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for open circuit.

    • STEP 7. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 8. Check harness between A-109 (terminal No. 2) camshaft position sensor connector and A-08 (terminal No. 12) engine-ECU connector.

  • Check output line for short circuit.

    • Q. Is the check result normal?

    STEP 9. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

    • Q. Is the diagnosis code set?

    STEP 10. Perform resistance measurement at A-109 camshaft position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 1 and earth.

    • Q. Is the check result normal?

    STEP 11. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 12. Check harness between A-109 (terminal No. 1) camshaft position sensor connector and A-08 (terminal No. 27) engine-ECU connector.

  • Check earthing line for open circuit and damage.

    • Q. Is the check result normal?

    STEP 13. Perform output wave pattern measurement at A-109 camshaft position sensor connector (Using an oscilloscope).

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Engine: Idling
  • Transmission: Neutral
  • Voltage between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 14. Connector check: B-206 engine control relay connector.

    Q. Is the check result normal?

    STEP 15. Check harness between A-109 (terminal No. 3) camshaft position sensor connector and B-206 (terminal No. 4) engine control relay connector.

  • Check power supply line for damage.

    • Q. Is the check result normal?

    STEP 16. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 17. Check harness between A-109 (terminal No. 2) camshaft position sensor connector and A-08 (terminal No. 12) engine-ECU connector.

  • Check output line for damage.

    • Q. Is the check result normal?

    STEP 18. Check camshaft position sensing ring.

    Q. Is the check result normal?

    STEP 19. M.U.T.-III diagnosis code.

  • Reconfirmation of diagnosis code.

    • Q. Is the diagnosis code set?

    Author: admin