FixVault
Home › Buick › 2012 › Regal Base › Repair and Diagnosis › External Pages › Different car › Section 369 (Hybrid/EV Control System) › Diagnostic Information and Procedures › DTC P2797 › Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  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 (Non Hybrid) , Line Pressure Check (Hybrid) .
About FixVault