Diagnostic Procedure

DTC P0480 DIAGNOSTIC PROCEDURE TABLE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line 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.
2		No	Go to the next step.
3	INSPECT COOLING FAN RELAY NO.1 CONNECTOR FOR POOR CONNECTION Turn ignition switch to OFF. Disconnect cooling fan relay No.1 connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion, etc.). Is there any malfunction?	Yes	Repair or replace terminal and/or connector, then go to Step 10.
3		No	Go to next step.
4	INSPECT COOLING FAN RELAY NO.1 POWER CIRCUIT FOR OPEN CIRCUIT Turn ignition key to ON (Engine OFF). Measure voltage between cooling fan relay No.1 terminal E (harness side) and body ground. Is voltage B+ ?	Yes	Go to next step.
4		No	Replace or replace harness for open circuit, then go to Step 10.
5	INSPECT COOLING FAN RELAY NO.1 Inspect cooling fan relay No.1. (See RELAY INSPECTION .) Is cooling fan relay No.1 okay?	Yes	Go to next step.
5		No	Replace cooling fan relay No.1, then go to Step 10.
6	INSPECT COOLING FAN RELAY NO.1 CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Measure voltage between cooling fan relay No.1 terminal A (harness-side) and body ground. Is voltage B+ ?	Yes	Repair or replace harness for short to power supply, then go to Step 10.
6		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 A (harness side) and body ground. Is there continuity?	Yes	Repair or replace harness for open circuit, then go to Step 10.
7		No	Go to next step.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn ignition switch to off. Disconnect PCM connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace terminal and/or connector, then go to Step 10.
8		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 A (harness-side) and PCM terminal 1M (harness-side). Is there continuity?	Yes	Go to next step.
9		No	Repair or replace harness for open circuit, then go to next step.
10	VERIFY TROUBLESHOOTING OF DTC P0480 COMPLETED Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Perform the KOEO self-test with WDS or equivalent, or following procedures. (See KOEO/KOER SELF TEST .) Access ECT PID. Start engine and warm up it until ECT PID above 100°C {212°F} Retrieve any DTC. Is PENDING CODE for this DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION .)
10		No	Go to next step.
11	VERIFY AFTER REPAIR PROCEDURE Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Is any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE .)
11		No	Troubleshooting completed.