DTC P0403 [WL-C, WE-C (Australian, European (L.H.D. U.K.) specs.)]

id0102c4807100

DTC P0403

EGR solenoid valve circuit malfunction
DETECTION CONDITION
•  The PCM monitors the EGR solenoid valve control signal. If the following conditions are detected, the PCM determines that the EGR solenoid valve circuit has a malfunction (open circuit).
―  The PCM turns the EGR solenoid valve off but the voltage remains low
―  The PCM internal driver IC temperature is more than 150 °C {320 °F} when the EGR solenoid valve is on
POSSIBLE CAUSE
•  EGR solenoid valve malfunction
•  Connector or terminal malfunction
•  Open circuit in wiring harness between main relay and EGR solenoid valve terminal A
•  Open circuit in wiring harness between EGR solenoid valve terminal B and PCM terminal 176
•  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
•  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
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
•  Connect the M-MDS to the DLC-2.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [WL-C, WE-C].)
4
INSPECT EGR SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the EGR solenoid 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 9.
No
Go to the next step.
5
INSPECT EGR SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT
•  Turn the engine switch to the ON position (Engine off).
•  Measure the voltage between EGR solenoid valve terminal A (wiring harness-side) and body ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
6
INSPECT EGR SOLENOID VALVE
•  Inspect the EGR solenoid valve.
•  Is the EGR solenoid valve normal?
Yes
Go to the next step.
No
Replace the EGR solenoid valve, then go to Step 9.
(See EGR SYSTEM REMOVAL/INSTALLATION [WL-C, WE-C].)
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
INSPECT EGR SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT
•  Turn the engine switch off.
•  Inspect for continuity between EGR solenoid valve terminal B (wiring harness-side) and PCM terminal 176 (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0403 COMPLETED
•  Turn the engine switch off.
•  Make sure to reconnect all disconnected connectors.
•  Turn the engine switch to the ON position (Engine off).
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Retrieve DTCs using the M-MDS.
•  Is the PENDING CODE for this DTC present?
Yes
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].)
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “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.