LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P281D or P281E: Transmission Control Solenoid Valve 8 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition Off and all vehicle systems Off. Disconnect the X175 harness connector at the T12 Automatic Transmission Assembly. It may take up to 2 min for all vehicle systems to power down, ignition On.
  2. Command the high side driver 1 Off.
  3. Connect a test lamp between the ignition circuit terminal 18 and ground.
  4. Verify the test lamp does not illuminate.
    • If the test lamp illuminates 
    1. Ignition Off.
    2. Disconnect the harness connector at the K71 Transmission Control Module, ignition On.
    3. Verify a test lamp does not illuminate between the ignition circuit terminal 18 and ground.
      • If the test lamp illuminates, repair the short to voltage on the circuit.
      • If the test lamp does not illuminate, replace the K71 Transmission Control Module.
    • If the test lamp does not illuminate 
  5. Ignition On.
  6. Verify the test lamp turns On and Off when commanding the high side driver 1 On and Off with a scan tool.
    • If the test lamp is always Off 
    1. Ignition Off, disconnect the harness connector at the K71 Transmission Control Module.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω 

      Replace the K71 Transmission Control Module.

    • If the test lamp turns On and Off 
  7. Remove the test lamp.
  8. Test for 1.4-2.2 V between the control circuit terminal 1 and ground.
    • If less than 1.4 V 
    1. Ignition Off, disconnect the harness connector at the K71 Transmission Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 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 K71 Transmission Control Module.
    • If greater than 2.2 V 
  9. Ignition Off, disconnect the harness connector at the K71 Transmission Control Module, ignition On.
  10. Test for less than 1 V between the control circuit and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V, replace the K71 Transmission Control Module.
    • If between 1.8-2.2 V 
  11. Perform the Component Testing.
scientia non olet · About LEMON Manuals