DTC P0403 [MZR-CD (RF Turbo)]

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DTC P0403

EGR control circuit
DETECTION CONDITION
•  The PCM monitors EGR valve control current when the engine switch is ON position. If the EGR valve control current is above threshold, the PCM determines that the EGR valve control circuit has a 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
•  Connector or terminal malfunction
•  Short to ground between EGR valve terminal B and PCM terminal 8
•  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 P0403 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 CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the EGR valve connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 8.
No
Go to the next step.
5
INSPECT EGR VALVE CONTROL CIRCUIT FOR SHORT TO GROUND
•  Disconnect EGR valve and PCM connectors.
•  Inspect for continuity between EGR valve terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace short to ground, then go to Step 8.
No
Go to the next step.
6
INSPECT EGR VALVE
•  Inspect the EGR valve.
•  Is the EGR valve normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 8.
(See EGR VALVE REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•   Turn the engine switch off.
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace terminal, then go to the next step.
No
Go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0403 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 M-MDS.
•  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.
9
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Is any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR-CD (RF Turbo)].)
No
Troubleshooting completed.