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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 10L80 (MF6) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0658, P0659, P2812, P2814, P2815, P281B, P281D Or P281E: Actuator High Control Circuit/Transmission Control Solenoid Valve Control 7-8 Circuit >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  3. Connect a test lamp between the test points: Control circuit terminal 11 @ Component harness & Ground
  4. Ignition - On / Vehicle - In Service Mode
  5. Perform the scan tool control function:High Side Driver 1 - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • X1 @ T12 Automatic Transmission Assembly
    4. Test for infinite resistance between the test points:Control circuit terminal 11 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 Ω between the test points:Control circuit terminal 11 @ Component harness & Terminal 33 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K71 Transmission Control Module
    • If the test lamp is always On 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • X1 @ T12 Automatic Transmission Assembly
    4. Ignition - On / Vehicle - In Service Mode
    5. Test for less than 1 V between the test points: Control circuit terminal 11 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K71 Transmission Control Module
    • Go to next step: If the test lamp turns On and Off 
  6. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector:
    • K71 Transmission Control Module
    • X1 @ T12 Automatic Transmission Assembly
  9. Test for less than 2 Ω between the test points:
    • {P2812, P2814, P2815} Control circuit terminal 24 @ Component harness & Terminal 17 @ Control module harness
    • {P281B, P281D, P281E} Control circuit terminal 25 @ Component harness & Terminal 1 @ Control module harness
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  10. Test for infinite resistance between the test points:
    • {P2812, P2814, P2815} Control circuit terminal 24 @ Component harness & Ground
    • {P281B, P281D, P281E} Control circuit terminal 25 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  11. Test for infinite resistance between the test points: Control circuit terminal 33 &
    • {P0658, P0659, P2812, P2814, P2815} Control circuit terminal 17
    • {P0658, P0659, P281B, P281D, P281E} Control circuit terminal 1
    • If less than infinite resistance 

      Repair the short between the circuits.

    • Go to next step: If infinite resistance 
  12. Ignition - On / Vehicle - In Service Mode
  13. Test for less than 1 V between the test points:
    • {P2812, P2814, P2815} Control circuit terminal 24 @ Component harness & Ground
    • {P281B, P281D, P281E} Control circuit terminal 25 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  14. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  15. Ignition/Vehicle - Off
  16. Remove the component:Transmission Cover
  17. Disconnect the electrical connector: Q77 Transmission Control Solenoid Valve
  18. Test for less than 2 Ω between the test points:Control circuit terminal 33 &
    • {P0658, P0659, P2812, P2814, P2815} Terminal 1 @ Q77G Transmission Control Solenoid Valve 7 (harness side)
    • {P0658, P0659, P281B, P281D, P281E} Terminal 1 @ Q77H Transmission Control Solenoid Valve 8 (harness side)
    • If 2 Ω or greater 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 Ω 
  19. Test for infinite resistance between the test points:Control circuit terminal 33 & Ground
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  20. Test for infinite resistance between the test points: Control circuit terminal 33 &
    • {P0658, P0659, P2812, P2814, P2815} Control circuit terminal 17
    • {P0658, P0659, P281B, P281D, P281E} Control circuit terminal 1
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  21. Test for less than 2 Ω between the test points:
    • {P2812, P2814, P2815} Terminal 2 @ Q77G Transmission Control Solenoid Valve 7 (harness side) & Control circuit terminal 17 @ K71 Transmission Control Module
    • {P281B, P281D, P281E} Terminal 2 @ Q77H Transmission Control Solenoid Valve 8 (harness side) & Control circuit terminal 1 @ K71 Transmission Control Module
    • If 2 Ω or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 Ω 
  22. Test for infinite resistance between the test points:Ground &
    • {P2812, P2814, P2815} Terminal 2 @ Q77G Transmission Control Solenoid Valve 7 (harness side)
    • {P281B, P281D, P281E} Terminal 2 @ Q77H Transmission Control Solenoid Valve 8 (harness side)
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  23. Test or replace the component: Q77 Transmission Control Solenoid Valve
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