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DTC P0482 [L8, LF]

id0102a18078b1

DTC P0482 | Cooling fan relay No.4 control circuit malfunction
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DETECTION CONDITION | • PCM monitors cooling fan relay No.4 control signal. If voltage remains low or high, PCM determines that fan relay circuit has a malfunction. Diagnostic support note • This is a continuous monitor (Other). • MIL does not illuminate. • PENDING CODE is available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is not available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Cooling fan relay No.4 malfunction • Connector or terminal malfunction • Open circuit in wiring harness between ignition switch and cooling fan relay No.4 terminal E • Open circuit in wiring harness between cooling fan relay No.4 terminal A and PCM terminal 1N • Short to ground in wiring harness between cooling fan relay No.4 terminal A and PCM terminal 1N • Short to power supply in wiring between cooling fan relay No.4 terminal A and PCM terminal 1N • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR 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.
3 | INSPECT COOLING FUN RELAY NO.4 CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect cooling fan relay No.4 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.
No | Go to the next step.
4 | INSPECT COOLING FUN RELAY NO.4 POWER CIRCUIT FOR OPEN CIRCUIT • Turn ignition switch to ON (Engine off). • Measure voltage between cooling fan relay No.4 terminal E (harness-side) and body ground. • Is voltage B+? | Yes | Go to the next step.
No | Replace or replace the wiring harness for an open circuit, then go to Step 10.
5 | INSPECT COOLING FUN RELAY NO.4 • Inspect cooling fan relay No.4. (See RELAY INSPECTION.) • Is cooling fan relay No.4 normal? | Yes | Go to the next step.
No | Replace the cooling fan relay No.4, then go to Step 10.
6 | INSPECT COOLING FUN RELAY NO.4 CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Measure voltage between cooling fan relay No.4 terminal A (harness-side) and body ground. • Is voltage B+? | Yes | Repair or replace the wiring harness for short to power supply, then go to Step 10.
No | Go to the next step.
7 | INSPECT COOLING FUN RELAY NO.4 CONTROL CIRCUIT FOR SHORT TO GROUND • inspect for continuity between cooling fan relay No.4 terminal A (harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for an open circuit, then go to Step 10.
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). • Is there any malfunction? | Yes | Repair or replace the terminal and/or connector, then go to Step 10.
No | Go to the next step.
9 | INSPECT COOLING FUN RELAY NO.4 CONTROL CIRCUIT FOR OPEN CIRCUIT • inspect for continuity between cooling fan relay No.4 terminal A (harness-side) and PCM terminal 1N (harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for an open circuit, then go to the next step.
10 | VERIFY TROUBLESHOOTING OF DTC P0482 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [L8, LF, L3].) • Is the DTC P0481 present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
11 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.