| P0490 | EGR control circuit range / performance (swerves to close side) |
|---|---|
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DETECTION CONDITION
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• The PCM monitors the EGR valve position using the EGR valve position sensor. The PCM compares the target and actual EGR positions. If the PCM detects that the EGR valve position swerves to the close side more than target, the PCM determines that the EGR valve has a range/performance problem.
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POSSIBLE CAUSE
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• EGR valve malfunction
• Obstruction in EGR valve
• EGR valve position sensor malfunction
• Connector or terminal malfunction
• PCM malfunction
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Diagnostic procedure
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has the FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
|
Perform repair or diagnosis according to the available repair information.
If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT
• Connect the M-MDS to DLC-2.
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the KOEO or KOER self-test.
• Is the same DTC retrieved?
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Yes
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Go to the next step.
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No
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Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
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4
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IIDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is P0406 or P042F on FREEZE FRAME DATA?
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Yes
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Go to the applicable DTC inspection.
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No
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Go to the next step.
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5
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INSPECT EGR VALVE AND EGR VALVE POSITION SENSOR CONNECTORS FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the EGR valve and EGR valve position sensor connectors.
• Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
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Yes
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Repair or replace terminal, then go to Step 9.
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No
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Go to the next step.
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6
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VISUALLY INSPECT EGR VALVE
• Disconnect the EGR valve connector.
• Remove the EGR valve without the EGR cooler hose disconnected.
• Visually inspect the EGR valve.
• Is there any obstruction (carbon deposit etc.) in the EGR valve?
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Yes
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Remove the obstruction, then go to the next step.
|
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No
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Go to the next step.
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7
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INSPECT WHETHER MALFUNCTION IS IN EGR VALVE OR EGR VALVE POSITION SENSOR
• Reconnect the EGR valve and EGR valve position sensor connectors.
• Access PCM PID EgrDc using the M-MDS.
• Open and close the EGR valve using the PID EgrDc simulation command.
• Visually inspect the EGR valve operation.
• Does the EGR valve operate according to simulation commanded values?
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Yes
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Go to Step 9.
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No
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Go to the next step.
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8
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INSPECT THE EGR VALVE
• Inspect the EGR valve.
• Is the EGR valve normal?
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Yes
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Go to Step 10.
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No
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Replace the EGR valve.
Then go to Step 10.
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9
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INSPECT EGR VALVE POSITION SENSOR
• Inspect the EGR valve position sensor.
• Is the EGR valve position sensor normal?
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Yes
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Go to the next step.
|
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No
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Replace the EGR valve.
Then go to the next step.
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10
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VERIFY THAT DTC P0490 TROUBLESHOOTING IS COMPLETED
• Make sure to reconnect all disconnected connectors.
• 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?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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11
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VERIFY AFTER REPAIR PROCEDURE
• Perform the after repair procedure.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
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No
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DTC troubleshooting completed.
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