Code No. P0606: Engine-ECU Main Processor Malfunction




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Condition
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check auxiliary battery.



  • Auxiliary battery check (Refer to GROUP 54A <PHEV> - Auxiliary Battery - On-vehicle Service - Auxiliary Battery Test ).

Q. Is the check result normal?

Go to Step 2.
Replace the auxiliary battery.

STEP 2. Perform voltage measurement at engine-ECU connector.



  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal IGN and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 3.

    Repair or replace the connector, or check and repair harness between ETACS-ECU connector terminal IGN and engine-ECU connector terminal IGN.

    • Check signal line for open/short circuit.

STEP 3. Check harness between ETACS-ECU connector terminal IGN and engine-ECU connector terminal IGN.



  • Check signal line for damage.

Q. Is the check result normal?

Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. Check engine control relay itself.



  • Engine control relay connector check.
  • Engine control relay continuity check (Refer to ).

Q. Is the check result normal?

Go to Step 5.
Repair or replace the connector, or replace the engine control relay.

STEP 5. Check harness between engine control relay connector terminal and engine-ECU connector terminal C/R.



  • Check signal line for short circuit.

Q. Is the check result normal?

Go to Step 6.
Repair or replace the connector, or repair the damaged harness wire.

STEP 6. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is diagnosis code stored?

Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).