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Home >> Chevrolet >> 2000 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.1L "W" Body (Lumina) >> Procedure No. 1

Procedure No. 1

  1. If cooling fan functional check has been performed, go to next step. If cooling fan functional check has not been performed, see COOLING FAN FUNCTIONAL CHECK .
  2. Disconnect fan control relay 1. Turn ignition on, engine off. If both fans are off, go to step  9. If both fans are not off, go to next step.
  3. Disconnect fan control relay 2. If both fans are off, go to step  5. If both fans are not off, go to next step.
  4. Remove fan control relay 3. If both fans are off, go to step  7. If both fans are not off, go to step  11.
  5. Disconnect engine coolant fan motor 1. Probe fan feed terminal (Light Blue wire) of engine coolant fan motor 1 connector using test light connected to ground. If test light illuminates, go to step  12. If test light does not illuminate, go to next step.
  6. Probe fan control relay 2 switch feed terminal (Black wire) at engine coolant fan motor 1 connector using test light connected to ground. If test light illuminates, go to step  13. If test light does not illuminate, go to step  17.
  7. Probe high speed fans control circuit (Dark Blue wire) at fan control relay 2 connector using test light connected to battery voltage. If test light illuminates, go to next step. If test light does not illuminate, go to step  16.
  8. Turn ignition off. Leave test light installed. Disconnect PCM. Turn ignition on, engine off. If test light is still illuminated, go to step  15. If test light is not still illuminated, go to step  18.
  9. Probe low speed fans control circuit (Dark Green wire) at fan control relay 1 connector using test light connected to battery voltage. If test light illuminates, go to next step. If test light does not illuminate, go to step  14.
  10. Turn ignition off. Leave test light installed. Disconnect PCM. Turn ignition on, engine off. If test light is still illuminated, go to step  15. If test light is not still illuminated, go to step  18.
  11. Check engine coolant fan motor 1 feed circuit (Light Blue wire) for short to voltage. If problem was found, repair as necessary. After repairs, perform COOLING FAN FUNCTIONAL CHECK . If problem was not found, go to step  16.
  12. Repair short to voltage in engine coolant fan motor 2 feed circuit (White wire). After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  13. Repair short to voltage in fan control relay 2 switch feed circuit (Black wire). After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  14. Replace fan control relay 1. After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  15. Repair short to ground in high speed fans control circuit (Dark Green wire) or low speed fans control circuit (Dark Blue wire). After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  16. Replace fan control relay 3. After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  17. Replace fan control relay 2. After repairs, perform COOLING FAN FUNCTIONAL CHECK .
  18. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, perform COOLING FAN FUNCTIONAL CHECK .
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