DTC P0480 [ZY]

id0102d3807400

DTC P0480

Cooling fan relay No.1 control circuit malfunction

DETECTION CONDITION

• The PCM monitors the cooling fan relay No.1 control signal. If the voltage remain low or high, the PCM determines that the cooling fan relay No.1 control has a malfunction.
Diagnostic support note
• This is continuous monitor (other)
• The MIL does not illuminate.
• The PENDING CODE is available if the PCM detects above malfunction condition during the first drive cycle.
• The FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Cooling fan relay No.1 malfunction
• Connector or terminal malfunction
• Open circuit wiring between the ignition switch and cooling fan relay No.1 terminal A
• Open circuit in wiring between cooling fan relay No.1 terminal E and PCM terminal 1AV
• Short to ground in wiring between cooling fan relay No.1 terminal E and PCM terminal 1AV
• Short to power circuit between cooling fan relay No.1 terminal E and PCM terminal 1AV
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
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, and corrosion).
• Is there any malfunction?
Yes
Repair or replace terminal and/or connector, then go to Step 10.
No
Go to next step.
4
INSPECT COOLING FAN RELAY NO.1 POWER CIRCUIT FOR OPEN
• Turn the ignition switch to the ON position. (Engine off).
• Measure voltage between cooling fan relay No.1 terminal A (wiring harness-side) and body ground.
• Is voltage B+?
Yes
Go to next step.
No
Replace or replace wiring harness for open, then go to Step 10.
5
INSPECT COOLING FAN RELAY NO.1
• Inspect the cooling fan relay No.1.
• Is cooling fan relay No.1 normal?
Yes
Go to next step.
No
Replace the cooling fan relay No.1, then go to Step 10.
6
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR SHORT TO POWER
• Measure voltage between cooling fan relay No.1 terminal E (wiring harness-side) and body ground.
• Is voltage B+?
Yes
Repair or replace wiring harness for short to power, then go to Step 10.
No
Go to next step.
7
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect continuity between cooling fan relay No.1 terminal E (wiring harness-side) and body ground.
• Is there continuity?
Yes
Repair or replace wiring harness for open, then go to Step 10.
No
Go to next step.
8
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, and corrosion).
• Is there any malfunction?
Yes
Repair or replace terminal and/or connector, then go to Step 10.
No
Go to next step.
9
INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between cooling fan relay No.1 terminal E (wiring harness-side) and PCM terminal 1AV (wiring harness-side).
• Is there continuity?
Yes
Go to next step.
No
Repair or replace wiring harness for open, then go to next step.
10
VERIFY TROUBLESHOOTING OF DTC P0480 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using WDS or equivalent.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace the PCM, then go to next step.
No
Go to next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Are any DTCs present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.