DTC P0402 [WL-C, WE-C (Australian, European (L.H.D. U.K.) specs.)]

id0102c4820500

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 at EGR feedback control. 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.
POSSIBLE CAUSE
•  Intake shutter valve malfunction
•  EGR valve malfunction
•  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 SERVICE INFORMATION AVAILABILITY
•  Verify related service information availability.
•  Is any related service information available?
Yes
Perform repair or diagnosis according to the available service 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.
(See DTC TABLE [WL-C, WE-C (Australian, European (L.H.D. U.K.) specs.)].)
No
Go to the next step.
4
INSPECT INTAKE AIR SYSTEM
•  Inspect intake air system for the air leak.
•  Is there any malfunction?
Yes
Repair or replace the intake air system, then go to Step 8.
No
Go to the next step.
5
INSPECT INTAKE SHUTTER VALVE OPERATION
•  Perform intake shutter valve operation inspection.
•  Does the intake shutter valve operate properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part, according to inspection result.
6
INSPECT EGR VALVE OPERATION
•  Perform the EGR Valve Operation Inspection.
•  Does the EGR valve operate properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part, according to inspection result.
7
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.
(See EGR SYSTEM REMOVAL/INSTALLATION [WL-C, WE-C].)
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0402 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Connect the M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and warm up.
•  Is the PENDING CODE for this DTC present?
Yes
Go to the next step.
No
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [WL-C, WE-C].)
(See PCM REMOVAL/INSTALLATION (U.K. Specs.) [WL-C, WE-C].)
9
VERIFY AFTER REPAIR PROCEDURE
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [WL-C, WE-C (Australian, European (L.H.D. U.K.) specs.)].)
No
Troubleshooting completed.