DTC P0490:00 [MZ-CD 1.6]
id0102g8049000
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DTC P0490:00 |
EGR valve control circuit high |
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DETECTION CONDITION
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• The PCM monitors the EGR valve position and compares the actual value with that calculated by the PCM. If the actual value for the EGR valve position exceeds 27 % compared to the calculated value, the PCM determines that the EGR valve control circuit is high.
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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
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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
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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 RELATED PENDING CODE AND/OR DTC
• Switch the ignition to ON (engine off).
• Perform the pending trouble code access procedure
• Is the PENDING CODE/DTC also present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
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No
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Go to the next step.
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4
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INSPECT EGR VALVE AND EGR VALVE POSITION SENSOR CONNECTORS FOR POOR CONNECTION
• Switch the ignition to 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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5
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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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6
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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 EGRP using the M-MDS.
• Open and close the EGR valve using the PID EGRP 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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7
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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 the next step.
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No
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Replace the EGR valve.
Then go to Step 9.
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8
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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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9
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VERIFY THAT DTC P0490:00 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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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the PCM.
Go to the next step.
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No
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Go to the next step.
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10
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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.
(See DTC TABLE [MZ-CD 1.6].)
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No
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DTC troubleshooting completed.
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