F–140
ON-BOARD DIAGNOSTIC
End Of Sie
DTC P0480
A6E397001086W04
Diagnostic procedure
DTC P0480 Fan relay control circuit malfunction
DETECTION
CONDITION
• PCM monitors cooling fan relay No.2 control signal at PCM terminal 4L. if PCM detects cooling fan relay
No.2 control signal does not change coolant temperature above 100 °C {212 °F}, PCM determines that
cooling fan relay No.2 control has malfunction.
POSSIBLE
CAUSE
• cooling fan relay No.2 malfunction
• Connector or terminal malfunction
• Open circuit in wiring between METER fuse and cooling fan relay No.2 terminal E
• Open circuit in wiring between cooling fan relay No.2 terminal A and PCM terminal 4L
• Short to ground in wiring between cooling fan relay No.2 terminal A and PCM terminal 4L
• Short to power circuit between cooling fan relay No.2 terminal A and PCM terminal 4L
• 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 COOLING FAN RELAY NO.2
CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect cooling fan relay No.2 connector.
• Inspect for poor connection (damaged/pulled-
out pins, corrosion, etc.).
• Is there malfunction?
Yes Repair or replace terminal and/or connector, then go to
Step 9.
No Go to next step.
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