LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0480: Cooling Fan Relay Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to next step.
  2. Classify Intermittent Or Continuous Concern -  Start engine. Turn on A/C to operate cooling fan relay. Using scan tool, check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0480 is present, go to next step. If DTC P0480 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Inspect Cooling Fan Relay For Poor Connection -  Turn ignition off. Remove cooling fan relay. Cooling fan relay is located in main fuse block at left side of engine compartment. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If problem is found, repair or replace connector or terminal as necessary. After repair, go to step  9.
  4. Inspect Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between ground and cooling fan relay terminal "C". See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in wire harness between cooling fan relay 4-pin harness connector terminal "C" and positive battery terminal. After repair, go to step  9.
  5. Inspect Cooling Fan Relay -  Using fused jumper wires, apply battery voltage to cooling fan relay terminal "A" and ground terminal "B". See Fig 1. Check for continuity between cooling fan relay terminals "C" and "D". Continuity should be present. If continuity is present, go to next step. If continuity is not present, replace cooling fan relay.
  6. Inspect PCM Connector For Poor Connection -  Disconnect PCM 104-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If problem is found, repair or replace connector or terminal as necessary. After repair, go to step  9.
  7. Inspect Control Circuit For Short -  Check for continuity between ground and cooling fan relay 4-pin harness connector terminal "B" (Red/Black wire). If continuity is present, repair short circuit to ground in Red/Black wire between cooling fan relay 4-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  9. If continuity is not present, turn ignition on. Measure voltage between ground and cooling fan relay terminal "B" (Red/Black wire). If about zero volts is present, go to next step. If battery voltage is present, repair short circuit to power in Red/Black wire between cooling fan relay 4-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47. After repair, go to next step.
  8. Inspect Control Circuit For Open Circuit -  Turn ignition off. Check for continuity in Red/Black wire between cooling fan relay 4-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47. See Figure. If continuity is present, go to next step. If continuity is not present, repair open circuit in Red/Black wire between cooling fan relay 4-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P0480 Completed -  Reconnect all connectors. Turn ignition on, engine off. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Turn A/C on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0480 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0480 is not present, go to next step.
  10. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
Fig 1: Identifying Cooling Fan Relay Terminals
G00042188Courtesy of MAZDA MOTORS CORP.
scientia non olet · About LEMON Manuals