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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.0L CATERA >> Auxiliary Engine Cooling Fan No. 1 Inoperative

Auxiliary Engine Cooling Fan No. 1 Inoperative

  1. Perform COOLING FAN SYSTEM CHECK . Go to next step.
  2. Turn ignition off. Connect fused jumper (5 amp) between fan control relay K26 diagnostic enable circuit (Brown/Blue wire) and ground. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 operate at low speed, go to next step. If auxiliary engine coolant fan 1 and auxiliary engine fan 2 do not operate at low speed, see AUXILIARY COOLING FANS NO. 1 & 2 INOPERATIVE .
    3. CAUTION: Installation of proper relay is critical. If an enhanced relay (equipped with a diode) is installed into a position requiring a standard relay (equipped without a diode) excessive current will damage any components associated with relay or its associated circuits.
  3. Remove fused jumper (5 amp). Turn ignition on, engine off. Remove fan control relay K52. Check ignition voltage supply circuit (terminal No. 4) of fan control relay K52 connector for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  4. Turn ignition off. Check ground circuit (Black wire) of auxiliary engine coolant fan 1 of fan control relay K52 connector for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  5. Check control circuit (Brown/White wire) of fan control relay coil of fan control relay K52 connector for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  6. Check fan control relay K28 and fan control relay K52 diagnostic enable circuit (Brown/White wire) for open. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  7. Check fan control relay K52 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  9. If problem was not found, go to next step.
  8. Replace fan control relay K52. After repairs, go to next step.
  9. Operate system to verify repair.
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