DTC P0480 [L3]

BME010200400210

DTC P0480

Fan control circuit malfunction

DETECTION CONDITION

• PCM monitors the fan control signal at PCM terminal 1U. If PCM sends signal to fan control module but voltage at terminal 1U does not change, PCM determines that fan control circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if PCM detects the above malfunction condition.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Fan control module malfunction
• Connector or terminal malfunction
• Open circuit in wiring between fan control module terminal 1B and PCM terminal 1U
• Short to power circuit between fan control module terminal 1B and PCM terminal 1U
• Short to ground in wiring between fan control module terminal 1B and PCM terminal 1U
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
INSPECT FAN CONTROL MODULE CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect fan control module connector.
• Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 8.
No
Go to the next step.
3
INSPECT FAN CONTROL MODULE
• Perform fan control module inspection.
• Is fan control module normal?
Yes
Go to the next step.
No
Replace fan control module, then go to Step 8.
4
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO POWER
• Measure voltage between fan control module connector terminal 1B and body ground.
• Is the voltage B+?
Yes
Repair or replace harness for short to power supply, then go to Step 8.
No
Go to the next step.
5
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO GROUND
• Inspect for continuity between fan control module terminal 1B and body ground.
• Is there continuity?
Yes
Repair or replace harness for short to ground, then go to Step 8.
No
Go to the next step.
6
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal and/or connector, then go to Step 8.
No
Go to the next step.
7
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between fan control module terminal 1B and PCM terminal 1U.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace harness for open, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC P0480 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.