DTC P0404 [WL-C, WE-C]

id0102b9831500

Australian, European (L.H.D. U.K.) specs.

DTC P0404

EGR control circuit range/performance
DETECTION CONDITION
•  The PCM monitors the difference between target EGR valve lift and actual EGR valve lift under the programmed condition.
If the difference is more or less than the programmed criteria the PCM determines that there is a malfunction in the EGR control circuit.
POSSIBLE CAUSE
•  Vacuum hose malfunction
―  Loose
―  Misconnection
―  Damaged
―  Scratched
•  Solenoid valve malfunction (stuck)
―  EGR solenoid valve
―  EGR control solenoid valve
―  VBC solenoid valve
―  Intake shutter solenoid valve (full)
―  Intake shutter solenoid valve (half)
•  EGR valve connector or terminal malfunction
•  PCM connector or terminal malfunction
•  EGR valve position sensor malfunction
•  EGR valve malfunction
•  Vacuum pump 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 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
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is DTC P0404 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
(See DTC TABLE [WL-C, WE-C].)
4
INSPECT VACUUM HOSE CONDITION
•  Visually inspect vacuum hose for followings:
―  Loose
―  Misconnection
―  Damaged
―  Scratched
•  Is there any malfunction?
Yes
Repair or replace malfunctioning part, then go to Step 10.
No
Go to the next step.
5
INSPECT MALFUNCTION IS IN SOLENOID VALVE STUCK OR ELSEWHERE
•  Inspect following solenoid valve for stuck.
―  EGR solenoid valve
―  EGR control solenoid valve
―  VBC solenoid valve
―  Intake shutter solenoid valve (full)
―  Intake shutter solenoid valve (half)
•  Are these solenoid valves normal?
Yes
Go to the next step.
No
Replace suspect solenoid valve, then go to Step 10.
6
INSPECT EGR VALVE AND PCM CONNECTORS FOR POOR CONNECTION
•  Turn the engine switch off.
•  Disconnect the EGR valve and PCM connectors.
•  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 10.
No
Go to the next step.
7
INSPECT EGR VALVE POSITION SENSOR
•  Inspect the EGR valve position sensor.
•  Is the EGR valve position sensor normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 10.
(See EGR VALVE REMOVAL/INSTALLATION [WL-C, WE-C].)
8
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 10.
(See EGR VALVE REMOVAL/INSTALLATION [WL-C, WE-C].)
9
INSPECT VACUUM PUMP
•  Inspect the vacuum pump.
•  Is the vacuum pump normal?
Yes
Go to the next step.
No
Inspect and repair suspect part according to inspection result, then go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P0404 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 [WL-C, WE-C].)
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Is any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [WL-C, WE-C].)
No
Troubleshooting completed.