#
DTC P0400 [MZR-CD (RF Turbo)]

id0102f1954600

DTC P0400 | EGR flow problem
--- | ---
DETECTION CONDITION | • The PCM monitors the EGR valve driving duty value after the engine starts. If the EGR valve driving duty value is more than 80 %, the PCM determines that the EGR recirculation flow is malfunction. Diagnostic support note • MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM. • 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 malfunction (stuck) • EGR valve position sensor 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 FREEZE FRAME DATA on repair order, then go to the next step.
2 | VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Check for related service repair information availability? | 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 | IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0400 on FREEZE FRAME DATA? | Yes | Go to the next step.
No | Go to troubleshooting procedures for DTC in FREEZE FRAME DATA. (See DTC TABLE [MZR-CD (RF Turbo)].)
4 | INSPECT EGR VALVE OPERATION • Perform the EGR Valve Operation Inspection. (See EGR Valve Operation Inspection.) • Does EGR valve operate properly? | Yes | Go to the next step.
No | Repair or replace malfunctioning part, according to inspection results. Then go to Step 6.
5 | INSPECT EGR VALVE POSITION SENSOR • Access EGRP PID with % and V mode. • Turn the engine switch to the ON position (engine off). • Move the EGR valve using EGRP PID % mode simulation function. • Monitor EGRP PID V mode. • Does EGRP PID V mode moves according to EGR valve actuate value? | Yes | Go to the next step.
No | Inspect the EGR valve position sensor. (See EGR VALVE POSITION SENSOR INSPECTION [MZR-CD (RF Turbo)].) • If the EGR valve position sensor normal, go to the next step. • If the EGR valve position sensor not normal, replace the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].) Then go to the next step.
6 | VERIFY TROUBLESHOOTING OF DTC P0400 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the engine switch to ON position (engine off). • Clear the DTC from the PCM memory using the WDS or equivalent. • Start the engine. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [MZR-CD (RF Turbo)].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZR-CD (RF Turbo)].)
No | Troubleshooting completed.