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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0482: Fan Relay No. 4 Control Circuit - Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect Cooling Fan Relay No. 4 Connector For Poor Connection -  Turn ignition off. Disconnect cooling fan relay No. 4 harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion, etc.). If malfunction is not present, go to next step. If malfunction is present, repair or replace suspected terminal or connector. After repair, go to step  10.
  4. Inspect Cooling Fan Relay No. 4 Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between cooling fan relay No. 4 harness connector terminal "E" (Green/Black wire) and body ground. See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in Green/Black wire between cooling fan relay No. 4 harness connector terminal "E" and ignition switch or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
    Fig 1: Identifying Cooling Fan Relay No. 4 Circuits & Harness Connector Terminals
    G00221511Courtesy of MAZDA MOTORS CORP.
  5. Inspect Cooling Fan Relay No. 4 -  Inspect cooling fan relay No. 4. Refer to COOLING FAN under MISCELLANEOUS CONTROLS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If cooling fan relay No. 4 is okay, go to next step. If cooling fan relay No. 4 is faulty, replace cooling fan relay No. 4. After repair, go to step  10.
  6. Inspect Cooling Fan Relay No. 4 Control Circuit For Short To Power -  Measure voltage between cooling fan relay No. 4 harness connector terminal "A" (White/Red wire) and body ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in White/Red wire between cooling fan relay No. 4 harness connector terminal "A" and PCM 30-pin harness connector terminal "4B". After repair, go to step  10.
  7. Inspect Cooling Fan Relay No. 4 Control Circuit For Short To Ground -  Check for continuity between cooling fan relay No. 4 harness connector terminal "A" (White/Red wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in White/Red wire between cooling fan relay No. 4 harness connector terminal "A" and PCM 30-pin harness connector terminal "4B" or replace wire harness. After repair, go to step  10.
  8. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Check for poor connection (such as damaged, pulled-out pins, corrosion). If terminals are okay, go to next step. If malfunction is present, repair or replace terminal/connector. After repair, go to step  10.
  9. Inspect Cooling Fan Relay No. 4 Control Circuit For Open Circuit -  Check for continuity between cooling fan relay No. 4 harness connector terminal "A" and PCM 30-pin harness connector terminal "4B" (White/Red wire). See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in White/Red wire between cooling fan relay No. 4 harness connector terminal "A" and PCM 30-pin harness connector terminal "4B" or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0482 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up until ECT PID more than 212°F (100°C). If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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