DTC P0481 [ZY]

id0102d3815200

DTC P0481

Cooling fan relay No.2 control circuit malfunction

DETECTION CONDITION

• The PCM monitors the cooling fan relay No.2 control signal. If the voltage remain low or high, the PCM determines that the cooling fan relay No.2 control has malfunction.
Diagnostic support note
• This is continuous monitor (other).
• The MIL does not illuminate.
• The FREEZE FRAME DATA is available if the PCM detects above malfunction condition during the first drive cycle.
• The PENDING is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Cooling fan relay No.2 malfunction
• Connector or terminal malfunction
• Open circuit in wiring between ignition switch and cooling fan relay No.2 terminal B
• Open circuit in wiring between cooling fan relay No.2 terminal D and PCM terminal 1AZ
• Short to ground in wiring between cooling fan relay No.2 terminal D and PCM terminal 1AZ
• Short to power circuit between cooling fan relay No.2 terminal D and PCM terminal 1AZ
• 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.2 CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the cooling fan relay No.2 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.2 POWER CIRCUIT FOR OPEN
• Turn the ignition switch to the ON position. (Engine off).
• Measure voltage between the cooling fan relay No.2 terminal B (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.2
• Inspect the cooling fan relay No.2.
• Is the cooling fan relay No.2 normal?
Yes
Go to next step.
No
Replace the cooling fan relay No.2, then go to Step 10.
6
INSPECT COOLING FAN RELAY NO.2 CONTROL CIRCUIT FOR SHORT TO POWER
• Measure voltage between cooling fan relay No.2 terminal D (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.2 CONTROL CIRCUIT FOR SHORT TO GROUND
• Inspect continuity between cooling fan relay No.2 terminal D (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.2 CONTROL CIRCUIT FOR OPEN CIRCUIT
• Inspect continuity between cooling fan relay No.2 terminal D (wiring harness-side) and PCM terminal 1AZ (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 P0481 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.