DTC P0606 – Engine-ECUMain Processor Malfunction MMC Colt

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OPERATION

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FUNCTION

System LSI checks the engine-ECU for abnormal conditions.

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TROUBLE JUDGMENT

Ignition switch is “ON” position.

No surveillance pulse signals is input for 0.5 second.

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PROBABLE CAUSE

Failed the engine-ECU

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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?