DTC P0480:00 [L3 Turbo]


id0102b7704600

DTC P0480:00

Cooling fan control circuit problem

DETECTION CONDITION
•  The PCM monitors the input voltage from the fan control module. If the voltage remains low or high, the PCM determines that the fan control circuit has a malfunction.
Diagnostic support note
•  This is a continuous monitor (other).
•  The MIL does not illuminate.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Fan control module connector or terminals malfunction
•  Short to ground or open circuit in fan control module power supply circuit
―  Short to ground in wiring harness between battery positive terminal and fan control module terminal 1D
―  FAN1 40 A fuse and/or FAN2 40 A fuse malfunction
―  Open circuit in wiring harness between battery positive terminal and fan control module terminal 1D
•  Short to ground in wiring harness between fan control module terminal 1C and PCM terminal 1AE
•  PCM connector or terminals malfunction
•  Short to power supply in wiring harness between fan control module terminal 1C and PCM terminal 1AE
•  Open circuit in wiring harness between fan control module terminal 1C and PCM terminal 1AE
•  Fan control module malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
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.
2
INSPECT FAN CONTROL MODULE CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the fan control module connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 9.
No
Go to the next step.
3
INSPECT FAN CONTROL MODULE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
•  Fan control module connector is disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the fan control module terminal 1D (wiring harness-side).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the FAN1 40 A fuse and FAN2 40 A fuse.
•  If the fuse is melt:
―  Repair or replace the wiring harness for a possible short to ground.
―  Replace the malfunctioning fuse.
•  If the fuse is deterioration:
―  Replace the malfunctioning fuse.
•  If the fuse is normal:
―  Repair or replace the wiring harness for a possible open circuit.
Go to Step 9.
4
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Fan control module connector is disconnected.
•  Switch the ignition to off.
•  Inspect for continuity between fan control module terminal 1C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in PCM internal circuit).
Go to Step 9.
No
Go to the next step.
5
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 9.
No
Go to the next step.
6
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Fan control module and PCM connectors are disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the fan control module terminal 1C (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No
Go to the next step.
7
INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Fan control module and PCM connectors are disconnected.
•  Switch the ignition to off.
•  Inspect for continuity between fan control module terminal 1C (wiring harness-side) and PCM terminal 1AE (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 Step 9.
8
INSPECT FAN CONTROL MODULE
•  Perform the Cooling Fan Control System Inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
No
Go to the next step.
9
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOEO or KOER self test.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
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.
No
DTC troubleshooting completed.