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Home >> Mazda >> 2010 >> 5 Touring, 2.3 L >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3] >> DTC P0480 >> Diagnostic procedure
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Diagnostic procedure

DTC P0480 [L3] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 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.
No Go to the next step.
2 INSPECT FAN CONTROL MODULE CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect fan control module connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
3 INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Fan control module connector is disconnected.
  • Turn the ignition switch off.
  • Inspect for continuity between fan control module terminal B (wiring-harness-side) and body ground.
  • Is there continuity?
 Yes If the short to ground circuit could be detected:
  • Repair or replace for a possible short to ground.

If the short to ground circuit could not be detected:

Then go to Step 8.
No Go to the next step.
4 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
5 INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Fan control module and PCM connectors are disconnected.
  • Turn the ignition switch to the ON position (Engine off).
  • Measure the voltage between fan control module terminal B (wiring-harness-side) and body ground.
  • Is the voltage greater than 1.5 V?
 Yes Repair or replace the wiring harness for open circuit, then go to Step 8.
No Go to the next step.
6 INSPECT FAN CONTROL MODULE SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Fan control module and PCM connectors are disconnected.
  • Inspect for continuity between fan control module terminal B (wiring-harness-side) and PCM terminal 1R (wiring-harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace wiring harness for open circuit, then go to Step 8.
7 INSPECT FAN CONTROL MODULE 
 Yes Go to the next step.
No Replace the fan control module, then go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0480 COMPLETED 
  • Clear the DTC from the PCM memory using the M-MDS.
  • Perform the KOEO self-test with M-MDS, or Turn A/C switch to ON with engine running.

    (See KOEO/KOER SELF TEST .)

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