DTC P0490 [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)]

id0102b0954800

DTC P0490

EGR solenoid valve control circuit high input
DETECTION CONDITION
•  The PCM monitors the EGR solenoid valve control signal. If the PCM turns the EGR solenoid valve on but the voltage remains high, the PCM determines that EGR solenoid valve circuit has a malfunction (circuit short to power supply).
POSSIBLE CAUSE
•  EGR solenoid valve malfunction
•  Short to power supply in wiring harness between EGR solenoid valve terminal B and PCM terminal 176
•  Connector or terminal malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related service repair information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
•  Connect the M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [WL-C, WE-C].)
4
INSPECT EGR SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the EGR solenoid valve connector.
•  Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
•  Is there malfunction?
Yes
Repair or replace the terminal, then go to Step 8.
No
Go to the next step.
5
INSPECT EGR SOLENOID VALVE MALFUNCTION
•  Perform EGR solenoid valve inspection.
•  Is the EGR solenoid valve normal?
Yes
Go to the next step.
No
Replace the EGR solenoid valve, then go to Step 8.
6
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the PCM connector.
•  Inspect for poor connection at terminal 176. (such as damaged/pulled-out pins, corrosion).
•  Is there malfunction?
Yes
Repair the terminal, then go to Step 8.
No
Go to the next step.
7
INSPECT EGR SOLENOID VALVE CONTROL CIRCUIT SHORT TO POWER SUPPLY
•  Turn the engine switch to the ON position (Engine off).
•  Measure the voltage between EGR solenoid valve terminal B (wiring harness-side) and body ground.
•  Is the voltage B+?
Yes
Repair or replace the wiring harness for short to power supply, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0490 COMPLETED
•  Turn the engine switch off.
•  Make sure to reconnect all disconnected connectors.
•  Turn the engine switch to the ON position (Engine off).
•  Clear the DTC from the memory using the M-MDS.
•  Start the engine.
•  Retrieve DTCs using the M-MDS.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “After Repair Procedure”.
•  Are any DTC present?
Yes
Go to the applicable DTC troubleshooting.
(See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
No
Troubleshooting completed.