DTC P0402 [AJ]

BME010200400202

Australian, General (L.H.D. R.H.D.) Specs.

DTC P0402

EGR flow excessive detected

DETECTION CONDITION

• PCM monitors difference in intake manifold pressures when EGR is operated and when it is stopped. If the difference is too large, PCM determines that EGR flow excessive.
Diagnostic support note
• This is an intermittent monitor (EGR).
• MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• EGR valve gasket is not installed.
• 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 FREEZE FRAME DATA on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT FOR OTHER DTCS
• Turn the ignition switch off then ON (Engine off).
• Have other DTCs been stored?
Yes
Repair circuit malfunction for applicable DTCs.
No
Go to the next step.
4
INSPECT EGR VALVE GASKET HAS INSTALLED
• Turn the ignition switch off.
• Remove EGR valve.
• Is 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
• Does EGR valve gasket have any crack and/or damage?
Yes
Replace the EGR valve gasket, then go to Step 6.
No
Go to the next step.
6
MONITOR EGR SYSTEM BY DRIVE MODE
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Run PCM adaptive memory procedure drive mode.
• Access RFC FLAG PID using WDS or equivalent.
• Is RFC FLAG PID OFF?
Yes
Retry this step.
No
Go to the next step.
7
MONITOR EGR SYSTEM BY DRIVE MODE
• Run HO2S heater, HO2S, and EGR system repair verification drive mode.
• Check EGR system Monitor has checked using On-Board Readiness Test function.
• Has EGR system been monitored?
Yes
Go to the next step.
No
Retry this step.
8
VERIFY TROUBLESHOOTING OF DTC P0402 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Access DIAGNOSTIC MONITORING TEST RESULTS.
• Verify TEST ID 10: 41: 00 value.
• Is value within specification?
Yes
Go to the next step.
No
Replace the PCM, then go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.