DTC P1303:28, P1303:78 [MZ-CD 1.6 (Y6) (EURO5 emission level)]
id0102g7444600
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DTC P1303:28 DTC P1303:78 |
EGR calibration fault |
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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 actual EGR valve position exceeds the target position excessively while the EGR valve is moving to close, the PCM determines that the EGR valve is calibration fault.
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POSSIBLE CAUSE
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• EGR valve connector or terminal malfunction
• Obstruction in EGR valve
• EGR valve 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 and DTC Reading Procedure.
• Is the other PENDING CODE/DTC also 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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Go to the next step.
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4
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PERFORM EXHAUST GAS RECIRCULATION VALVE LEARNED VALVES RESET
• Clear the DTC from the PCM memory using the M-MDS.
• Perform the EXHAUST GAS RECIRCULATION VALVE LEARNED VALUES RESET.
• Run the vehicle under the FREEZE FRAME DATA stored condition.
• Is the same DTC present?
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Yes
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Go to the next step.
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No
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Troubleshooting is completed.
Go to Step 9.
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5
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INSPECT EGR VALVE CONNECTOR FOR POOR CONNECTION
• Switch the ignition to OFF.
• Disconnect the EGR valve connector.
• 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 8.
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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
• The EGR valve connector is disconnected.
• Remove the EGR valve without the EGR cooler hose disconnected.
• Visually inspect EGR valve.
• Is there any obstacle (carbon deposit etc.) on EGR valve?
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Yes
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Remove the obstacle, 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 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 the next step.
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8
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VERIFY THAT DTC P1303:28, P1303:78 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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9
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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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