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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 6T30 (MH9) Or 6T40 (MH8) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P182E or P1915: Internal Mode Switch >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, remove the control valve body cover.
    NOTE: You must perform Circuit/System Verification  first.
  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 3 A 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 2 Ω between the adapter harness terminal 2 and the X2 connector terminal F at the Q8 Control Solenoid Valve Assembly.
      • If greater than 2 Ω, replace the Q8 Control Solenoid Valve Assembly.
      • If less than 2 Ω.
    4. Disconnect the connector at the K20 Engine Control Module.
    5. Test for less than 2 Ω in the vehicle harness park/neutral signal circuit, end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the K20 Engine Control Module.
    • If Park/Neutral is displayed 
  11. Replace the B15 Transmission Internal Mode Switch.
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