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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2534 or P2535 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, and all vehicle systems OFF, disconnect the X1 16-way harness connector at transmission.
  2. Ignition OFF, test for less than 5 Ω between terminal 5 and ground at the transmission case.
    • If 5 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 5 Ω 
  3. Verify a test lamp illuminates between terminal 4 and ground at the transmission case.
    • 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 the test lamp illuminates 
  4. Ignition OFF.
  5. Verify a test lamp does not illuminates between terminal 12 and ground at the transmission case.
    • If the test lamp illuminates 

      Test the ignition voltage circuit for a short to B+.

    • If the circuit tests normal 

      Replace the Q8 control solenoid valve assembly.

  6. Ignition ON.
  7. Verify a test lamp illuminates between terminal 12 and ground at the transmission case.
    • 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 voltage 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 voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    • If the test lamp illuminates 

      Replace the Q8 control solenoid valve assembly.

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