Code No. P0490: EGR Valve Position Sensor Circuit High Input




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 16: EGR valve position sensor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Perform resistance measurement at EGR valve assembly connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Resistance between terminal engine-ECU EGRE line and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 5.
Go to Step 3.

STEP 3. Check harness between EGR valve assembly connector terminal and engine-ECU connector terminal EGRE.



  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

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

STEP 4. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 16: EGR valve position sensor

Q. Is the check result normal?

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

STEP 5. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 16: EGR valve position sensor

Q. Is the check result normal?

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