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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 Fan Control Module Connector For Poor Connection -  Turn ignition off. Disconnect fan control module 3-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If connections are okay, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  9.
  4. Inspect Fan Control Module Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between fan control module 3-pin harness connector terminal "1B" and body ground. See Fig 1. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Red/Black wire between fan control module 3-pin harness connector terminal "1B" and PCM 104-pin harness connector terminal No. 44 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
    Fig 1: Identifying Fan Control Module Circuits & Harness Connector Terminals
    G00221551Courtesy of MAZDA MOTORS CORP.
  5. Inspect Fan Control Module Signal Circuit For Short To Ground -  Turn ignition off. Check for continuity between fan control module harness connector terminal "1B" and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Red/Black wire between fan control module 3-pin harness connector terminal "1B" and PCM 104-pin harness connector terminal No. 44 or replace wire harness. After repair, go to step  9.
  6. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If terminals are okay, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to step  9.
  7. Inspect Fan Control Module Signal Circuit For Open Circuit -  Turn ignition off. Check for continuity in Red/Black wire between fan control module 3-pin harness connector terminal "1B" and PCM 104-pin harness connector terminal No. 44. See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Red/Black wire between fan control module 3-pin harness connector terminal "1B" and PCM 104-pin harness connector terminal No. 44 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
  8. Inspect Fan Control Module -  Check fan control module. See appropriate ELECTRIC COOLING FANS article in ENGINES. If fan control module is okay, go to next step. If fan control module is faulty, replace fan control module. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P0480 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. If same DTC is not present, go to next step. If 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.
  10. 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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