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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P2797: Auxiliary Transmission Fluid Pump Performance >> Circuit/System Testing

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 in the B+ circuit end to end.
      • If 2 or greater, repair the open/high resistance in the circuit.
      • If less than 2, 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 between the G5 Transmission Fluid Pump Auxiliary ground circuit X1 terminal 2 and ground.
    • If 10 or greater 
    1. Ignition OFF.
    2. Test for less than 2 in the ground circuit end to end.
      • If 2 or greater, repair the open/high resistance in the circuit.
      • If less than 2, repair the open/high resistance in the ground connection.
    • If less than 10 
  5. Connect the harness connector at the G5 Transmission Fluid Pump Auxiliary.
  6. Connect a 30A 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 in the switch control circuit terminal 87 end to end.
      • If 2 or greater, repair the open/high resistance in the circuit.
      • If less than 2, 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 (Non Hybrid) .
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