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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0482 [L3] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online 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. 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 terminal and/or connector, then go to Step 10.
No Go to the next step.
4 INSPECT COOLING FAN 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 harness for open circuit, then go to Step 10.
5 INSPECT COOLING FAN 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 cooling fan relay No. 4, then go to Step 10.
6 INSPECT COOLING FAN 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 harness for short to power supply, then go to Step 10.
No Go to the next step.
7 INSPECT COOLING FAN RELAY NO. 4 CONTROL CIRCUIT FOR SHORT TO GROUND 
  • Inspect continuity between cooling fan relay No. 4 terminal A (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace harness for 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 terminal and/or connector, then go to Step 10.
No Go to the next step.
9 INSPECT COOLING FAN RELAY NO. 4 CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between cooling fan relay No. 4 terminal A (harness-side) and PCM terminal 71(1), 4B(2) (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace harness for 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.
  • 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 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.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
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