DTC P0480 [13B-MSP]

id0102g1807400

DTC P0480

Cooling fan relay No.1 control circuit problem
DETECTION CONDITION
•  The PCM monitors the cooling fan relay No.1 control voltage when the PCM turns the cooling fan relay No.1 off. If the control voltage is low, the PCM determines that the cooling fan No.1 control circuit voltage is low.
•  The PCM monitors the cooling fan relay No.1 control voltage when the PCM turns the cooling fan relay No.1 on. If the control voltage is high, the PCM determines that the cooling fan No.1 control circuit voltage is high.
Diagnostic support note
•  This is a continuous monitor (other).
•  The MIL does not illuminate.
•  PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA is not available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  Connector or terminal malfunction
•  Open circuit in wiring harness between main relay terminal C and cooling fan relay No.1 terminal A
•  Short to ground in wiring harness between main relay terminal C and cooling fan relay No.1 terminal A
•  Short to ground in wiring harness between cooling fan relay No.1 terminal E and PCM terminal 1M
•  Short to power supply in wiring harness between cooling fan relay No.1 terminal E and PCM terminal 1M
•  Cooling fan relay No.1 malfunction
•  Open circuit in wiring harness between cooling fan relay No.1 terminal E and PCM terminal 1M
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED SERVICE INFORMATION AVAILBAILITY
•  Verify related Service information availability.
•  Is any related Service information available?
Yes
Perform repair or diagnosis according to th available Service information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
INSPECT COOLING FAN RELAY NO.1 CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch off.
•  Disconnect the cooling fan relay No.1 connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
3
INSPECT COOLING FAN RELAY NO.1 POWER CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
•  Turn the ignition switch to the ON position (engine off).
•  Measure the voltage between cooling fan relay No.1 terminal A (wiring harness-side) and body ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit or short to ground, then go to Step 9.
4
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR SHORT TO GROUND
•  Turn the ignition switch off.
•  Inspect for continuity between cooling fan relay No.1 terminal E (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
No
Go to the next step.
5
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Turn the ignition switch to the ON position (engine off).
•  Measure the voltage between cooling fan relay No.1 terminal E (wiring harness-side) and body ground.
•  Is the voltage B+?
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.
6
INSPECT COOLING FAN RELAY NO.1
•  Inspect the cooling fan relay No.1.
•  Is there any malfunction?
Yes
Replace the cooling fan relay No.1, then go to Step 9.
No
Go to the next step.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Turn the ignition switch off.
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
8
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch off.
•  Inspect for continuity between cooling fan relay No.1 terminal E (wiring harness-side) and PCM terminal 1M (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 the next step.
9
VERIFY TROUBLESHOOTING OF DTC P0480 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the PENDING CODE same as DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [13B-MSP].)
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.
(See DTC TABLE [13B-MSP].)
No
DTC troubleshooting completed.