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Diagnostic Procedure

DTC P0480 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.
No Record the FREEZE FRAME on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for 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.
No Go to the next step.
3 INSPECT COOLING FAN RELAY NO. 1 CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch 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 the terminal and/or connector, then go to Step 10.
No Go to the next step.
4 INSPECT COOLING FAN RELAY NO. 1 POWER CIRCUIT FOR OPEN CIRCUIT 
  • Turn ignition switch 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 the next step.
No Replace or replace the wiring harness for an 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 normal?
 Yes Go to the 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 SUPPLY 
  • Measure voltage between cooling fan relay No. 1 terminal A (wiring 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 FAN RELAY NO. 1 CONTROL CIRCUIT FOR SHORT TO GROUND 
  • inspect for continuity between cooling fan relay No. 1 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 FAN RELAY NO. 1 CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • inspect for continuity between cooling fan relay No. 1 terminal A (wiring harness-side) and PCM terminal 1M (wiring 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 P0480 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 ).

  • Is the DTC P0480 present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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