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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> On-Board Diagnostic [Engine Control System MZR 2.5] (3 Of 5) >> DTC P0480:00 >> Diagnostic Procedure

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 COOLING FAN RELAY NO. 1 
  • Switch the ignition to off.
  • Remove the cooling fan relay No. 1.
  • Inspect the cooling fan relay No. 1.

    (See RELAY INSPECTION .)

  • Is there any malfunction?
 Yes Replace the cooling fan relay No. 1, then go to Step 8.
No Go to the next step.
3 INSPECT COOLING FAN RELAY NO. 1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT 
  • Cooling fan relay No. 1 is removed.
  • Measure the voltage at the cooling fan relay No. 1 terminal E (wiring harness-side).
  • Is the voltage B+  ?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible short to ground or open circuit, then go to Step 8.
4 INSPECT COOLING FAN RELAY NO. 1 SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Cooling fan relay No. 1 is removed.
  • Inspect for continuity between cooling fan relay No. 1 terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes If the short to ground circuit could be detected:
  • Repair or replace the wiring harness for a possible short to ground.

If the short to ground circuit could not be detected:


Go to Step 8.
No Go to the next step.
5 INSPECT PCM CONNECTOR CONDITION 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the connector and/or terminals, then go to Step 8.
No Go to the next step.
6 INSPECT COOLING FAN RELAY NO. 1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Cooling fan relay No. 1 is removed.
  • Verify that the PCM connector is disconnected.
  • Switch the ignition to ON (engine off).
  • Measure the voltage at the cooling fan relay No. 1 terminal A (wiring harness-side).
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
No Go to the next step.
7 INSPECT COOLING FAN RELAY NO. 1 SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Cooling fan relay No. 1 is removed.
  • Verify that the PCM connector is disconnected.
  • Switch the ignition to off.
  • Inspect for continuity between cooling fan relay No. 1 terminal A (wiring harness-side) and PCM terminal 1U (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.

    (See AFTER REPAIR PROCEDURE .)

  • Perform the KOEO or KOER self test.

    (See KOEO/KOER SELF TEST .)

  • Is the same DTC present?
 Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No DTC troubleshooting completed.
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