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Inoperative in Low Speed

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  1. Disconnect the KR20C Cooling Fan Low Speed relay, ignition ON:
  2. Verify a test lamp illuminates between ground and the KR20C Cooling Fan Low Speed Relay B+ circuit terminal 30.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the relay B+ circuit, end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp and disconnect the R10 Cooling Fan Resistor.
    2. Test for infinite resistance between the relay circuit terminals listed below and ground:
    • KR20C Cooling Fan Low Speed Relay terminal 87.
    • KR20C Cooling Fan Low Speed Relay terminal 30.
    • If less than infinite resistance, repair the short to ground in the circuit. Replace the fuse as necessary.
    • If the test lamp illuminates 
  3. Ignition OFF, install the KR20C Cooling Fan Relay. Disconnect R10 Cooling Fan Resistor, Ignition ON.
  4. Command the cooling fan ON at low speed with a scan tool.
  5. Verify a test lamp illuminates between the R10 Cooling Fan Resistor terminal X1 A and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Disconnect the KR20C Cooling Fan Low Speed Relay.
    3. Test for less than 2 Ω between KR20C Cooling Fan Low Speed Relay terminal 87 and Cooling Fan Resistor terminal X1 A.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, test or replace KR20C Cooling Fan Low Speed Relay.
    • If the test lamp illuminates 
  6. Ignition OFF, reconnect the Cooling Fan Resistor and disconnect the harness connector at the G10 Cooling Fan Motor.
    1. Ignition ON, Command the cooling fan ON at low speed with a scan tool.
    2. Verify a test lamp illuminates between the G10 Cooling Fan Motor terminal 1 and ground.
      • If the test lamp does not illuminate 
    3. Ignition OFF.
    4. Test for less than 2 Ω between the Cooling Fan Resister terminal X2 A and G10 Cooling Fan terminal 1, end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates 
  7. Replace the R10 Cooling Fan Resistor.
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