Posted in Mitsubishi Colt

B1740,B1741 – Blown turn-signal lamp bulb COLT MMC Colt

 Posted by  Posted on September 27, 2020

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSES

  • Malfunction of the turn-signal lamp bulb
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

    • DIAGNOSIS PROCEDURE

    STEP 1. Confirm which turn-signal lamp is defective.

    Q. Which turn-signal lamp fails to illuminate correctly?

    STEP 2. Connector check: A-10 and A-11 front combination lamp (turn: LH) connector or A-25 and A-26 front combination lamp (turn: RH) connector.

    Q. Is the check result normal?

    STEP 3. Check the bulb(s) of the front turn-signal lamps.

    Q. Is the check result normal?

    STEP 4. Resistance measurement at A-11 front combination lamp (turn: LH) connector or A-25 front combination lamp (turn: RH) connector.

  • Resistance between A-11 front combination lamp (turn: LH) connector terminal No.3 and body earth
  • Resistance between A-25 front combination lamp (turn: RH) connector terminal No.3 and body earth

    • Q. Is the check result normal?

    STEP 5. Check the wiring harness from A-11 front combination lamp (turn: LH) connector terminal No.3 or A-25 front combination lamp (turn: RH) connector terminal No.3 to body earth.

  • Check the earth wires for open circuit.

    • Q. Is the check result normal?

    STEP 6. Connector check: B-234 ETACS-ECU connector

    Q. Is the check result normal?

    STEP 7. Check the wiring harness from A-10 front combination lamp (turn: LH) connector terminal No.1, A-26 front combination lamp (turn: RH) connector terminal No.1 to B-234 ETACS-ECU connector terminal No.3, No.4.

  • Check the output lines for open circuit.

    • Q. Is the check result normal?

    STEP 8. Retest the system.

    Q. Is the check result normal?

    STEP 9. Connector check: A-07 side turn-signal lamp (LH) connector or A-01 side turn-signal lamp (RH) connector.

    Q. Is the check result normal?

    STEP 10. Check the bulb(s) of side turn-signal lamps.

    Q. Is the check result normal?

    STEP 11. Resistance measurement at A-07 side turn-signal lamp (LH) connector or A-01 side turn-signal lamp (RH) connector.

  • Resistance between A-07 side turn-signal lamp (LH) connector terminal No.2 and body earth
  • Resistance between A-01 side turn-signal lamp (RH) connector terminal No.2 and body earth

    • Q. Is the check result normal?

    STEP 12. Check the wiring harness from A-07 side turn-signal lamp (LH) connector terminal No.2 or A-01 side turn-signal lamp (RH) connector terminal No.2 and body earth.

  • Check the earth wires for open circuit.

    • Q. Is the check result normal?

    STEP 13. Connector check: B-234 ETACS-ECU connector

    Q. Is the check result normal?

    STEP 14. Check the wiring harness from A-07 side turn-signal lamp (LH) connector terminal No.1, A-01 side turn-signal lamp (RH) connector terminal No.1 to B-234 ETACS-ECU connector terminal No.3, No.4.

  • Check the output lines for open circuit.

    • Q. Is the check result normal?

    STEP 15. Retest the system.

    Q. Is the check result normal?

    STEP 16. Connector check: E-01 rear combination lamp (turn: LH) or E-04 rear combination lamp (turn: RH).

    Q. Is the check result normal?

    STEP 17. Check the bulb(s) of rear turn-signal lamps.

    Q. Is the check result normal?

    STEP 18. Resistance measurement at E-01 rear combination lamp (turn: LH) connector or E-04 rear combination lamp (turn: RH) connector.

  • Resistance between E-01 rear combination lamp (turn: LH) connector terminal No.4 and body earth
  • Resistance between E-04 rear combination lamp (turn: RH) connector terminal No.2 and body earth

    • Q. Is the check result normal?

    STEP 19. Check the wiring harness from E-01 rear combination lamp (turn: LH) connector terminal No.4 or E-04 rear combination lamp (turn: RH) connector terminal No.2 to body earth.

  • Check the earth wires for open circuit.

    • Q. Is the check result normal?

    STEP 20. Connector check: B-234 ETACS-ECU connector

    Q. Is the check result normal?

    STEP 21. Check the wiring harness from E-01 rear combination lamp (turn: LH) connector terminal No.3, E-04 rear combination lamp (turn: RH) connector terminal No.3 to B-234 ETACS-ECU connector terminal or No.3, No.4.

  • Check the output lines for open circuit.

    • Q. Is the check result normal?

    STEP 22. Retest the system.

    Q. Is the check result normal?

    STEP 23. Check the wiring harness from A-26 front combination lamp (turn: RH) connector terminal No.1, A-01 side turn-signal lamp (RH) connector terminal No.1, E-04 rear combination lamp (turn: RH) connector terminal No.6 to B-234 ETACS-ECU connector terminal No.4.

  • Check the output lines for short circuit.

    • Q. Is the check result normal?

    STEP 24. Check the wiring harness from A-10 front combination lamp (turn: LH) connector terminal No.1, A-07 side turn-signal lamp (LH) connector terminal No.1, E-01 rear combination lamp (turn: LH) connector terminal No.1 to B-234 ETACS-ECU connector terminal No.3.

  • Check the output lines for short circuit.

    • Q. Is the check result normal?

    STEP 25. Check whether the diagnosis code is reset.

    Q. Is the diagnosis code set?

    Author: admin