DTC P0402 [MZR-CD (RF Turbo)]

BME010200400212

DTC P0402

EGR flow excessive detected

DETECTION CONDITION

• The PCM monitors the difference between the target air amount and intake air amount while the EGR system is operating. If the difference between the target air amount and the intake air amount is more than the threshold, the PCM determines that there is a malfunction in the EGR system.
Diagnostic support note
• The MIL illuminates if the PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• The EGR valve gasket is not installed.
• The EGR valve gasket has been damaged.
• 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 bulletins and/or on-line 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
INSPECT FOR OTHER DTCS
• Turn the engine switch to the ON position. (Engine off).
• Have other DTCs been stored?
Yes
Repair circuit malfunction for the applicable DTCs.
No
Go to the next step.
4
INSPECT EGR VALVE GASKET HAS INSTALLED
• Turn the engine switch off.
• Remove the EGR valve.
• Is the EGR valve gasket installed?
Yes
Go to the next step.
No
Install the EGR valve gasket, then go to Step 6.
5
INSPECT EGR VALVE GASKET MALFUNCTION
• Inspect if there is any crack or damage on the EGR valve gasket?
Yes
Replace the EGR valve gasket, then next step.
No
Go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P0402 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Perform the Repair Verification Drive Mode.
• Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
Replace the PCM, then go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.