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Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 468 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P0480, P0481, P0691, P0692, P0693, or P0694: Cooling Fan Relay >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect all of the cooling fan relays. Ignition ON.
    2. NOTE:

    The following tests must be performed on all three fan relay circuits.

  2. Verify that a test lamp illuminates between ground and a relay coil ignition circuit terminal listed below:
    • KR20J Cooling Fan Low Speed Relay terminal 85/2
    • KR20K Cooling Fan High Speed Relay terminal 85/2
    • KR20E Cooling Fan Speed Control Relay terminal 86/1
    • If the test lamp does not illuminate 
    1. Ignition OFF, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit of the appropriate cooling fan relay, 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, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Remove the test lamp.
    2. Test for infinite resistance between the appropriate cooling fan relay ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance test or replace the appropriate cooling fan relay.
    • If the test lamp illuminates 
    3. NOTE:

    The following tests must be performed on all three fan relay circuits.

  3. Connect a DMM, set on the diode setting, between ground and a relay control circuit terminal listed below:
    • KR20J cooling fan low speed relay terminal 86/1
    • KR20K cooling fan high speed relay terminal 86/1
    • KR20E cooling fan speed control relay terminal 85/2
  4. Verify the DMM reading is greater than 2.5 V or displays O.L with the cooling fan relays commanded OFF with a scan tool.
    • If 2.5 V or less 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the appropriate relay coil control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If greater than 2.5 V or displays O.L. 
  5. Verify the DMM reading is less than 1 V when commanding the cooling fan relays ON with a scan tool.
    • If greater than 1 V or displays OL. 
    1. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the appropriate cooling fan relay control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    3. Ignition OFF, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
    4. Test for less than 2 Ω in the appropriate cooling fan relay control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 1 V 
  6. Test or replace the appropriate cooling fan relay.
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