LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2000 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Mechanical >> Cooling Fan >> Engine Cooling Fan System - Troubleshooting >> Electric Cooling Fan Circuit Diagnosis >> 3.0L CATERA >> Auxiliary Cooling Fans No. 1 & 2 Inoperative

Auxiliary Cooling Fans No. 1 & 2 Inoperative

  1. Perform COOLING FAN SYSTEM CHECK . Go to next step.
    2. 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.
  2. Remove fan control relay K26. Check battery voltage circuit (Red wire) of relay coil of fan control relay K26 connector for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  3. Check battery voltage circuit (Red wire) of auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 of fan control relay K26 connector for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  4. Check supply voltage circuit (Red/White wire) of auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 of fan control relay K26 connector for short to ground or open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  5. Check supply voltage circuit (Red wire) of electric cooling fan of fan control relay K26 connector for short to ground. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  6. Check control circuit (Brown/Blue wire) of relay coil of fan control relay K26 connector for open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  7. Place fan control relay K26 back in ECM housing. Disconnect auxiliary engine coolant fan 1 connector. Connect fused jumper (5 amp) between fan control relay K26 diagnostic enable circuit and ground. Connect test light between supply voltage circuit (Red/White wire) of auxiliary engine coolant fan 1 connector and ground. If test light illuminates, go to step  10. If test light does not illuminate, go to next step.
  8. Check fan control relay K26 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  9. Replace fan control relay K26. After repairs, go to step  21.
  10. Leave fused jumper (5 amp) in place. Remove fan control relay K52 Connect auxiliary engine fan 1 connector. Connect fused jumper (20-amp) between ground circuit (terminal No. 2) of auxiliary engine coolant fan 1 of fan control relay K52 connector and ground. If auxiliary engine coolant fan 1 operates, go to step  14. If auxiliary engine coolant fan 1 does not operate, go to next step.
  11. Check ground circuit (Brown/Green wire) of auxiliary engine coolant fan 1 for open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  12. Check auxiliary engine coolant fan 1 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  13. Replace auxiliary engine coolant fan 1. After repairs, go to step  21.
  14. Check ground circuit of auxiliary engine coolant fan 2 for open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  15. Leave fused jumper (5 amp) wire in place. Connect a 20 A fused jumper wire between ground circuit (terminal No. 2) of auxiliary engine coolant fan 1 of fan control relay K52 connector and supply voltage circuit (terminal No. 5) of auxiliary engine coolant fan 2 of fan control relay K52 connector. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 operate at low speed, go to step  19. If auxiliary engine coolant fan 1 and auxiliary engine coolant fan 2 do not operate at low speed, go to next step.
  16. Check supply voltage circuit (Red/White wire) of auxiliary engine coolant fan 2 for open. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  17. Check auxiliary engine coolant fan 2 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  18. Replace auxiliary engine coolant fan 2. After repairs, go to step  21.
  19. Check fan control relay K52 connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  21. If problem was not found, go to next step.
  20. Replace fan control relay K52. After repairs, go to next step.
  21. Operate system to verify repair.
scientia non olet · About LEMON Manuals