ON-BOARD DIAGNOSTIC
F–135
F
Diagnostic procedure
POSSIBLE
CAUSE
• EGR valve malfunction
• Connector or terminal malfunction
• Short to power circuit in wiring between EGR valve terminal E and PCM terminal 4E
• Short to power circuit in wiring between EGR valve terminal A and PCM terminal 4H
• Short to power circuit in wiring between EGR valve terminal B and PCM terminal 4K
• Short to power circuit in wiring between EGR valve terminal F and PCM terminal 4N
• Short to ground circuit in wiring between EGR valve terminal E and PCM terminal 4E
• Short to ground circuit in wiring between EGR valve terminal A and PCM terminal 4H
• Short to ground circuit in wiring between EGR valve terminal B and PCM terminal 4K
• Short to ground circuit in wiring between EGR valve terminal F and PCM terminal 4N
• Open circuit in wiring between EGR valve terminal E and PCM terminal 4E
• Open circuit in wiring between EGR valve terminal A and PCM terminal 4H
• Open circuit in wiring between EGR valve terminal B and PCM terminal 4K
• Open circuit in wiring between EGR valve terminal F and PCM terminal 4N
• Open circuit in wiring between main relay terminal D and EGR valve terminal C
• Open circuit in wiring between main relay terminal D and EGR valve terminal D
• PCM malfunction
STEP INSPECTION ACTION
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
Yes Go to next step.
No Intermittent concern exists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
2 INSPECT POOR CONNECTION OF EGR VALVE
• Turn ignition key to OFF.
• Disconnect EGR valve connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunctions?
Yes Repair or replace terminals and/or connector, then go to
Step 9.
No Go to next step.
DTC P0403 EGR valve (stepper motor) circuit malfunction
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