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Home >> Suzuki >> 2002 >> XL-7 Plus >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (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

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
  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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