DTC P0481[L3]

id0102a2821100

DTC P0481

Cooling fan relay No.2 and No.3 control circuit malfunction

DETECTION CONDITION

•  PCM monitors cooling fan relay No.2 and No.3 control signal. If voltage remains low or high, PCM determines that fan relay No.2 and No.3 circuit has a malfunction.

Diagnostic support note

•  This is a continuous monitor (Other).

•  The MIL does not illuminate.

•  PENDING CODE is available if PCM detects the above malfunction condition.

•  FREEZE FRAME DATA is not available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Cooling fan relay No.2 malfunction

•  Cooling fan relay No.3 malfunction

•  Connector or terminal malfunction

•  Open circuit in wiring harness between ignition switch and cooling fan relay No.2 terminal A

•  Open circuit in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 1W

•  Open circuit in wiring harness between ignition switch and cooling fan relay No.3 terminal E

•  Open circuit in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W

•  Short to ground in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 1W

•  Short to power supply in wiring between cooling fan relay No.2 terminal E and PCM terminal 1W

•  Short to ground in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W

•  Short to power supply in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W

•  PCM malfunction

DTC P0481	Cooling fan relay No.2 and No.3 control circuit malfunction
DETECTION CONDITION	• PCM monitors cooling fan relay No.2 and No.3 control signal. If voltage remains low or high, PCM determines that fan relay No.2 and No.3 circuit has a malfunction. Diagnostic support note • This is a continuous monitor (Other). • The MIL does not illuminate. • PENDING CODE is available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is not available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Cooling fan relay No.2 malfunction • Cooling fan relay No.3 malfunction • Connector or terminal malfunction • Open circuit in wiring harness between ignition switch and cooling fan relay No.2 terminal A • Open circuit in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 1W • Open circuit in wiring harness between ignition switch and cooling fan relay No.3 terminal E • Open circuit in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W • Short to ground in wiring harness between cooling fan relay No.2 terminal E and PCM terminal 1W • Short to power supply in wiring between cooling fan relay No.2 terminal E and PCM terminal 1W • Short to ground in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W • Short to power supply in wiring harness between cooling fan relay No.3 terminal A and PCM terminal 1W • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME on the repair order, then go to the next step.
2	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.
2		No	Go to the next step.
3	INSPECT COOLING FAN RELAY NO.2 AND NO.3 CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect cooling fan relay No.2 and 3 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
3		No	Go to the next step.
4	INSPECT COOLING FAN RELAY NO.2 AND NO.3 POWER CIRCUIT FOR OPEN CIRCUIT • Turn ignition switch to the ON position (Engine off). • Measure voltage between following terminals and body ground. ― Cooling fan relay No.2 terminal A (harness side) ― Cooling fan relay No.3 terminal E (harness side) • Is voltage B+?	Yes	Go to the next step.
4		No	Replace or replace the wiring harness for an open circuit, then go to Step 10.
5	INSPECT COOLING FAN RELAY NO.2 AND NO.3 • Inspect cooling fan relay No.2 and No.3. (See RELAY INSPECTION.) • Are cooling fan relay No.2 and No.3 normal?	Yes	Go to the next step.
5		No	Replace the cooling fan relay No.2 or No.3, then go to Step 10.
6	INSPECT COOLING FAN RELAY NO.2 AND NO.3 CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Measure voltage between following terminals and body ground. ― Cooling fan relay No.2 terminal E (harness side) ― Cooling fan relay No.3 terminal A (harness side) • Is voltage B+?	Yes	Repair or replace the wiring harness for short to power supply, then go to Step 10.
6		No	Go to the next step.
7	INSPECT COOLING FAN RELAY NO.2 AND NO.3 CONTROL CIRCUIT FOR SHORT TO GROUND • Inspect for continuity between following terminals and body ground. ― Cooling fan relay No.2 terminal E (harness side) ― Cooling fan relay No.3 terminal A (harness side) • Is there continuity?	Yes	Repair or replace the wiring harness for an open circuit, then go to Step 10.
7		No	Go to the next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, corrosion, etc.). • Is there any malfunction?	Yes	Repair or replace the terminal and/or connector, then go to Step 10.
8		No	Go to the next step.
9	INSPECT COOLING FAN RELAY NO.2 AND NO.3 CONTROL CIRCUIT FOR OPEN CIRCUIT • Inspect for continuity between following terminals and PCM terminal 1W (harness side). ― Cooling fan relay No.2 terminal E (harness side) ― Cooling fan relay No.3 terminal A (harness side) • Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for an open circuit, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0481 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. (See KOEO/KOER SELF TEST[L3].) • Is the DTC P0481 present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION[L3].)
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE[L3].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE[L3].)
11		No	Troubleshooting completed.