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Home >> Suzuki >> 2001 >> Esteem GL, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Esteem 1.8L >> Diagnostic Tests >> DTC P0480: Radiator Fan Control Circuit Malfunction >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST  . If DTC P0480 is set, go to next step. If DTC P0480 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Turn ignition on. Backprobing, measure voltage between ground and ECM 35-pin connector E92 terminal No. 3 (Orange/Black wire). See Figure . With engine coolant temperature less than 200°F (93°C), reading should be 10-14 volts. With engine coolant temperature 208°F (98°C) or more, reading should be 0-2 volts. If voltages are as specified, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article. Go to next step.
  3. If intermittent problem is not found, replace ECM and go to DTC CONFIRMATION TEST  . If voltages are not as specified, go to next step.
  4. Turn ignition off. Remove radiator cooling fan relay from engine compartment fuse/relay block at left side of engine compartment. See Figure . Measure resistance between radiator cooling fan relay terminals No. 3 and 4. If resistance is 70-110 ohms, go to next step. If resistance is not 70-110 ohms, replace radiator cooling fan relay and go to DTC CONFIRMATION TEST  .
  5. Inspect for open or short in Black/White wire between radiator cooling fan relay and ignition switch. Also check for open or short in circuit between radiator cooling fan relay and ECM 35-pin connector E92 terminal No. 3. See WIRING DIAGRAMS article. See Figure . Repair as necessary. If wires are okay, replace ECM and go to DTC CONFIRMATION TEST  .
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