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Home >> Suzuki >> 2002 >> Esteem GL, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.8L >> Diagnostic Tests >> DTC P0480: Radiator Cooling Fan Control Circuit Malfunction >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Turn ignition on. Backprobing at ECM, measure voltage between ground and ECM harness connector E92 terminal No. 3 (Orange/Black wire). See Figure . When engine coolant temperature is less than 200°F (93°C), reading should be 10-14 volts. When engine coolant temperature is 208°F (98°C) or more, reading should be 0-2 volts. If voltages are as specified, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If intermittent problem is not found, substitute a known good ECM, and repeat DTC CONFIRMATION TEST  . If voltages are not as specified, go to next step.
  3. Turn ignition off. Remove radiator cooling fan relay from engine compartment fuse/relay block at located left side of engine compartment. See Figure . Check cooling fan relay socket cavities and relay terminals for clean tight connections. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  4. Using DVOM, measure resistance between cooling fan relay terminals No. 3 and 4. See Figure . Resistance should be 70-110 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace cooling fan relay. After repair, repeat DTC CONFIRMATION TEST  .
  5. Check for open or short in Black/White wire between radiator cooling fan relay and ignition switch. See WIRING DIAGRAMS article. Also, check for open or short in Orange/Black wire between radiator cooling fan relay and ECM. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem with wiring is found, go to next step.
  6. Substitute a known good ECM, and retest system. After repair, repeat DTC CONFIRMATION TEST  . If DTC does not reset, testing is complete.
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