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DTC P0402 [MZR-CD (RF Turbo)]

id0102f1820500

DTC P0402 | EGR flow excessive detected
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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. • The PCM monitors the difference between target oxygen density and actual oxygen density while the EGR is operating at EGR feedback control. If the difference between the target density and actual density 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 | • Intake shutter valve malfunction • EGR valve malfunction • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Go to the next step.
4 | INSPECT INTAKE SHUTTER VALVE OPERATION • Perform intake shutter valve operation inspection. (See 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.
5 | INSPECT EGR VALVE OPERATION • Perform the EGR Valve Operation Inspection. (See 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.
6 | 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 VALVE REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to the next step.
7 | 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. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • 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 [MZR-CD (RF Turbo)].)
8 | VERIFY AFTER REPAIR PROCEDURE • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.