Code No. P0490: Exhaust Gas Recirculation Valve (stepper motor) Circuit Malfunction (battery short)




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check exhaust gas recirculation valve (stepper motor) itself.



  • Exhaust gas recirculation valve connector check.
  • Exhaust gas recirculation valve (stepper motor) check (Refer to GROUP 17 - Emission Control <PHEV> - Exhaust Gas Recirculation (EGR) System - Exhaust Gas Recirculation Valve (Stepper Motor) Check ).

Q. Is the check result normal?

Go to Step 2.
Repair or replace the connector, or replace the exhaust gas recirculation valve.

STEP 2. Check harness between exhaust gas recirculation valve connector terminal and engine-ECU connector terminal EGRA, EGRB, EGRC, EGRD.



  • Check output line for short circuit.

Q. Are the check results normal?

Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. 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 ).