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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P182E Or P1915: Internal Mode Switch >> Circuit/System Testing

Circuit/System Testing

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NOTE:

You must perform Circuit/System Verification first.

  1. Ignition OFF, remove the automatic transmission fluid pan. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement .
  2. Disconnect the B15 Transmission Internal Mode Switch connector at the Q8 Control Solenoid Valve Assembly. Ignition ON.
  3. 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.

    • Go to next step: If High High High High is displayed 
  4. 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.
    • Go to next step: If In Gear is displayed 
  5. Install a 3 A 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
  6. Verify the scan tool Transmission Control Module 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.

    • Go to next step: If 1 Low and 3 High is displayed 
  7. Connect a 3 A fused jumper wire between Park/Neutral switch signal circuit terminal F and low reference circuit terminal A at the Q8 Control Solenoid Valve Assembly.
  8. 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 2 Ω in the signal circuit wire end to wire end.
      • If 2 Ω or greater, repair the open/high resistance in the wire circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • Go to next step: If Park/Neutral is displayed 
  9. Replace the B15 Transmission Internal Mode Switch.
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