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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - 6T40 - DTC P0973 To DTC P2764 And Troubleshooting Procedures) >> Diagnostic Information and Procedures >> DTC P182E or P1915: Internal Mode Switch >> Circuit/System Testing

Circuit/System Testing

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

    You must perform Circuit/System Verification first.

  1. Ignition OFF, remove the control valve body cover.
  2. Connect the vehicle harness connector to the Q8 Control Solenoid Valve Assembly.
  3. Disconnect the B15 Transmission Internal Mode Switch connector at the Q8 Control Solenoid Valve Assembly.
  4. Ignition ON.
  5. Verify the scan tool engine control module Park/Neutral Position Switch parameter displays In Gear.
    • If In Gear is not displayed 
    1. Ignition OFF, disconnect the vehicle harness X1 connector at the Q8 Control Solenoid Valve Assembly.
    2. Install the DT-48616-10  adapter harness to the X1 connector at the Q8 Control Solenoid Valve Assembly.
    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.
    4. Disconnect the harness connector at the K20 Engine Control Module.
    5. Test for infinite resistance between the signal circuit and ground at the vehicle harness K20 Engine Control Module connector.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If In Gear is displayed  
  6. Verify the scan tool transmission control module Internal Mode Switch A/B/C/P parameter displays High/High/High/High.
    • If High/High/High/High is not displayed 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If High/High/High/High is displayed  
  7. Install a 3A fused jumper wire between the low reference circuit terminal F and each signal circuit listed below one at a time at the Q8 Control Solenoid Valve Assembly.
    • Signal A - terminal B
    • Signal B - terminal C
    • Signal C - terminal D
    • Signal P - terminal E
  8. Verify the scan tool transmission control module A/B/C/P parameter displays 1 Low and 3 High when a signal circuit is grounded.
    • If 1 Low and 3 High is not displayed 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If 1 Low and 3 High is displayed 
  9. Connect a 3-amp fused jumper wire between terminal A and terminal F.
  10. Verify the ECM Park/Neutral Position Switch parameter displays Park/Neutral.
    • If Park/Neutral is not displayed 
    1. Ignition OFF, remove the jumper wire and disconnect the X1 connector at the Q8 Control Solenoid Valve Assembly.
    2. Install the DT-48616-10  adapter harness to the X1 connector at the Q8 Control Solenoid Valve Assembly.
    3. Test for less than 2Ω between the adapter harness terminal 2 and the X2 connector terminal F at the Q8 Control Solenoid Valve Assembly.
      • If greater than 2Ω, replace the Q8 Control Solenoid Valve Assembly.
      • If less than 2Ω .
    4. Disconnect the connector at the K20 Engine Control Module.
    5. Test for less than 2Ω in the vehicle harness park/neutral 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 Park/Neutral is displayed 
  11. Replace the B15 Transmission Internal Mode Switch.
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