Circuit/System Testing

Both Cooling Fans Always ON

1. Ignition OFF, disconnect KR20C Cooling Fan Low Speed Relay, ignition ON.
2. Verify that both cooling fans are OFF.
   • If the cooling fans are ON 
   1. Ignition OFF, disconnect the harness connector at the G10R Cooling Fan Motor-Right, ignition ON.
   2. Test for less than 1V between KR20C Cooling Fan Low Speed Relay terminal 87/5 and ground.
      • If 1V or greater, repair the short to voltage in the relay controlled output circuit.
   • If the cooling fans are OFF 
3. Test or replace the KR20C Cooling Fan Low Speed Relay.

One Cooling Fan Always ON

1. Ignition OFF, disconnect the KR20D Cooling Fan High Speed Relay, ignition ON.
2. Verify the cooling fan is OFF.
   • If the cooling fan is ON 
   1. Ignition OFF, disconnect the harness connector at the G10L Cooling Fan Motor-Left, ignition ON.
   2. Test for less than 1V between KR20D Cooling Fan High Speed Relay terminal 30/3 and ground.
      • If 1V or greater, repair the short to voltage in the relay controlled output circuit.
   • If the cooling fan is OFF 
3. Test or replace the KR20D Cooling Fan High Speed Relay.