P0340 – Camshaft Position Sensor System MMC L200 IV



OPERATION

  • A power voltage of 5 V is applied to the camshaft position sensor power terminal (terminal No. 3) from the engine-ECU (terminal No. 69) and earthed to engine-ECU (terminal No. 90) from the camshaft position sensor (terminal No. 1).
  • The sensor signal is inputted to the engine-ECU (terminal No. 66) from the camshaft position sensor output terminal (terminal No. 2).

  • FUNCTION

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

  • TROUBLE JUDGMENT

  • Battery positive voltage is 6 – 16 V.
  • The number of output pulses from the camshaft position sensor per engine rotation is one or less.

  • PROBABLE CAUSES

  • Failed camshaft position sensor
  • Open/short circuit or harness damage in camshaft position sensor circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: A-43 camshaft position sensor connector

    Q. Is the check result normal?

    STEP 2. Perform voltage measurement at A-43 camshaft position sensor connector.

  • Use special tool harness (MB991709) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.
  • Q. Is the check result normal?

    STEP 3. Perform voltage measurement at C-105 engine-ECU connector.

  • Measure engine-ECU terminal voltage.
  • Disconnect A-43 camshaft position sensor connector.
  • Ignition switch: ON
  • Voltage between terminal No. 66 and earth.
  • Q. Is the check result normal?

    STEP 4. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for open circuit and damage.
  • STEP 5. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 6. Check harness between A-43 (terminal No. 2) camshaft position sensor connector and C-105 (terminal No. 66) engine-ECU connector.

  • Check output line for short circuit.
  • Q. Is the check result normal?

    STEP 7. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
  • Q. Is the diagnosis code set?

    STEP 8. Perform voltage measurement at A-43 camshaft position sensor connector.

  • Use special tool harness (MB991709) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.
  • Q. Is the check result normal?

    STEP 9. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 10. Check harness between A-43 (terminal No. 3) camshaft position sensor connector and C-105 (terminal No. 69) engine-ECU connector.

  • Check power supply line for short circuit and damage.
  • Q. Is the check result normal?

    STEP 11. Perform resistance measurement at A-43 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 12. Connector check: C-105 engine-ECU connector

    Q. Is the check result normal?

    STEP 13. Check harness between A-43 (terminal No. 1) camshaft position sensor connector and C-105 (terminal No. 90) engine-ECU connector.

  • Check earthing line for open circuit and damage.
  • Q. Is the check result normal?

    STEP 14. Perform output wave pattern measurement at A-43 camshaft position sensor (Using an oscilloscope).

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Engine: Idling
  • Transmission: Neutral <M/T> or P range <A/T>
  • Voltage between terminal No. 2 and earth.
  • Q. Is the check result normal?

    Author: admin