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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Automatic Transmission - 6T40 - DTC P0601 To DTC P0971) >> Diagnostic Information and Procedures >> DTC P0850, P0851, P0852: Park/Neutral Position Switch >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    You must perform the Circuit/System Verification first.

  1. Ignition OFF, disconnect the X1 Q8 Control Solenoid Valve Assembly harness connector at the automatic transmission.
  2. Install the DT-48616-10  adapter harness to the vehicle harness connector.
    3. NOTE:

    All testing in steps3 through 5 will be performed at the DT-48616-10  adapter harness connector.

  3. Test for less than 5Ω between the ground circuit terminal 2 and ground.
    • If 5Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 5Ω 
  4. Ignition ON.
  5. Test for 11-13V between signal circuit terminal 3 and ground.
    • If not between 11-13V 
    1. Ignition OFF, remove the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between signal circuit terminal 3 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance.
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K20 Engine Control Module.
    • If between 11-13V 
  6. Ignition OFF, disconnect the DT-48616-10  adapter harness from the vehicle wire harness.
  7. Remove the transmission control valve body cover.
  8. Connect the vehicle harness connector to the Q8 Control Solenoid Valve Assembly.
  9. Disconnect the B15 Transmission Internal Mode Switch X2 electrical connector from the Q8 Control Solenoid Valve Assembly.
  10. Ignition ON.
  11. Verify the scan tool ECM Park/Neutral Position Switch parameter displays In Gear.
    • If In Gear is not displayed 
    1. Ignition OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly.
    2. Install the DT-48616-10  adapter harness to the Q8 Control Solenoid Valve Assembly X1 connector.
    3. Test for infinite resistance between the DT-48616-10  adapter harness connector terminals 2 and 3.
      • If less than infinite resistance, replace the Q8 Control Solenoid Valve Assembly.
      • If infinite resistance, replace the K20 Engine Control Module.
      • If In Gear is displayed 
  12. Connect a 3A fused jumper between the Q8 Control Solenoid Valve Assembly X2 connector signal circuit terminal A and ground. Ignition ON.
  13. Verify the scan tool ECM Park/Neutral Position Switch parameter displays Park/Neutral.
    • If Park/Neutral is not displayed 
    1. Ignition OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly.
    2. Install the DT-48616-10  adapter harness to the Q8 Control Solenoid Valve Assembly X1 connector.
    3. Test for less than 2Ω between adapter harness connector terminal 3 and the Q8 Control Solenoid Valve Assembly connector signal circuit terminal A.
      • If 2Ω or greater, replace the Q8 Control Solenoid Valve Assembly.
      • If less than 2Ω, replace the K20 Engine Control Module.
    • If Park/Neutral is displayed 
  14. Replace the B15 Transmission Internal Mode Switch.
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