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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T70 - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P182E or P1915: Internal Mode Switch >> Circuit/System Testing

Circuit/System Testing

    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 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 
  6. 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 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the neutral start 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 
  7. Install a 3A fused jumper wire between the low reference circuit terminal A and each signal circuit listed below one at a time at the Q8 Control Solenoid Valve Assembly.
    • Signal A - terminal E
    • Signal B - terminal D
    • Signal C - terminal C
    • Signal P - terminal B
  8. Verify the scan tool TCM A/B/C/P 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 3A fused jumper wire between park/neutral switch signal circuit terminal F and low reference circuit terminal A at the Q8 Control Solenoid Valve Assembly.
  10. Verify the scan tool engine control module Park/Neutral Position Switch parameter displays Park/Neutral.
    • If Park/Neutral is not displayed 
    1. Ignition OFF, disconnect the connector at the K20 Engine Control Module.
    2. 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 Park/Neutral is displayed 
  11. Replace the B15 Transmission Internal Mode Switch.
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