DTC P0606 – Engine-ECUMain Processor Malfunction MMC Colt



OPERATION


FUNCTION

  • System LSI checks the engine-ECU for abnormal conditions.

  • TROUBLE JUDGMENT

  • Ignition switch is “ON” position.
  • No surveillance pulse signals is input for 0.5 second.

  • PROBABLE CAUSE

  • Failed the engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. Check battery.

    Q. Is the check result normal?

    STEP 2. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 3. Perform voltage measurement at A-09 engine-ECU connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 122 and earth.
  • Q. Is the check result normal?

    STEP 4. Connector check: B-240 ignition switch connector

    Q. Is the check result normal?

  • Check signal line for open/short circuit.
  • STEP 5. Connector check: B-240 ignition switch connector

    Q. Is the check result normal?

    STEP 6. Check harness between B-240 (terminal No. 2) ignition switch connector and A-09 (terminal No. 122) engine-ECU connector.

  • Check signal line for damage.
  • Q. Is the check result normal?

    STEP 7. Connector check: B-206 engine control relay connector

    Q. Is the check result normal?

    STEP 8. Check engine control relay itself.

    Q. Is the check result normal?

    STEP 9. Check harness between B-206 (terminal No. 2) engine control relay connector and A-09 (terminal No. 107) engine-ECU connector.

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

    STEP 10. M.U.T.-III diagnosis code

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

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