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Circuit/System Testing

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  1. Ignition OFF, disconnect the KR86 transmission fluid pump relay - auxiliary, Ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the 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.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the X1 harness connector at the G5 Transmission Fluid Pump - Auxiliary, test for infinite resistance between the switched control circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the G5 Transmission Fluid Pump - Auxiliary.
    • If the test lamp illuminates 
  3. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the G5 Transmission Fluid Pump - Auxiliary. It may take up to 2 minutes for all vehicle systems to power down.
  4. Test for less than 10 Ω between the G5 Transmission Fluid Pump - Auxiliary ground circuit X1 terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  5. Connect the harness connector at the G5 Transmission Fluid Pump - Auxiliary.
  6. Connect a 30 A fused jumper wire between the B+ circuit terminal 30 and the switch control circuit terminal 87. Ignition ON.
  7. Verify the G5 Transmission Fluid Pump - Auxiliary is ON.
    • If the Pump is not ON 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the switch control circuit terminal 87 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the G5 Transmission Fluid Pump - Auxiliary.
    • If the Pump is ON 
  8. Test or replace the KR86 Transmission Fluid Pump Relay - Auxiliary.
    • If the DTC resets 
  9. Refer to transmission Line Pressure Check .
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