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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - 9T50 (M3E) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0960, P0962, P0963, P0964, P0966, P0967, P0968, P0970, P0971, P2670, P2671, P2718, P2720, P2721, P2812, P2814, P2815, P281B, P281D Or P281E: Transmission Control Solenoid Valve >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: T12 Automatic Transmission Assembly
  3. Connect a test lamp between the test points: Control circuit terminal 28 & Ground
  4. Ignition - On / Vehicle - In Service Mode
  5. Perform the scan tool control function: High Side Driver 2 - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Connect the electrical connector: T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector: T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Test for infinite resistance between the test points: Control circuit terminal 28 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance, go to next step.
    6. Test for less than 2 Ω between the test points: Control circuit terminal 28 @ Component harness & Terminal 49 @ 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: T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: K71 Transmission Control Module
    5. Ignition » On / Vehicle » In Service Mode
    6. Test for less than 1 V between the test points: Control circuit terminal 28 @ 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
    • If the test lamp turns On and Off 
  6. Connect the electrical connector: T12 Automatic Transmission Assembly
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector: T12 Automatic Transmission Assembly
  9. Disconnect the electrical connector: K71 Transmission Control Module
  10. Test for less than 2 Ω between the test points:
    • { P0960, P0962, P0963 }Control circuit terminal 26 @ Component harness & Terminal 19 @ Control module harness
    • { P0960, P0962, P0963 }Control circuit terminal 27 @ Component harness & Terminal 3 @ Control module harness
    • { P0960, P0962, P0963 }Control circuit terminal 12 @ Component harness & Terminal 20 @ Control module harness
    • { P0960, P0962, P0963 }Control circuit terminal 25 @ Component harness & Terminal 4 @ Control module harness
    • { P0960, P0962, P0963 }Control circuit terminal 24 @ Component harness & Terminal 18 @ Control module harness
    • { P0960, P0962, P0963 }Control circuit terminal 14 @ Component harness & Terminal 2 @ Control module harness
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω  , go to next step.
  11. Test for infinite resistance between the test points:
    • { P0960, P0962, P0963 }Control circuit terminal 26 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 27 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 12 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 25 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 24 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 14 @ Component harness & ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance  , go to next step.
  12. Ignition » On / Vehicle » In Service Mode
  13. Test for less than 1 V between the test points:
    • { P0960, P0962, P0963 }Control circuit terminal 26 @ Component harness & ground
    • { P0964, P0966, P0967 }Control circuit terminal 27 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 12 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 25 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 24 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 14 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V  , go to next step.
  14. Connect the electrical connector: T12 Automatic Transmission Assembly
  15. Ignition/Vehicle - Off
  16. Disconnect the electrical connector: T12 Automatic Transmission Assembly
  17. Remove the component: Transmission Cover
  18. Connect the electrical connector: T12 Automatic Transmission Assembly
  19. Disconnect the electrical connector: Q77A Transmission Control Solenoid Valve
  20. Test for less than 2 Ω between the test points: Control circuit terminal?49 &
    • { P0960, P0962, P0963 }Terminal 1@Q77A Transmission Control Solenoid Valve 1
    • { P0964, P0966, P0967 } Terminal 1@Q77B Transmission Control Solenoid Valve 2
    • { P0964, P0966, P0967 } Terminal 1@Q77C Transmission Control Solenoid Valve 3
    • { P0964, P0966, P0967 } Terminal 1@Q77D Transmission Control Solenoid Valve 4
    • { P0964, P0966, P0967 } Terminal 1@Q77G Transmission Control Solenoid Valve 7
    • { P0964, P0966, P0967 } Terminal 1@Q77H Transmission Control Solenoid Valve 8
    • If 2 Ω or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • If less than 2 Ω  , go to next step.
  21. Test for infinite resistance between the test points:
    • Control circuit terminal 49 & Ground
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • If infinite resistance  , go to next step
  22. Test for less than 2 Ω between the test points:
    • { P0960, P0962, P0963 } Terminal 2@Q77A Transmission Control Solenoid Valve 1-Electrical Connector& Control circuit terminal 19
    • { P0964, P0966, P0967 } Terminal 2@Q77B Transmission Control Solenoid Valve 2-Electrical Connector & Control circuit terminal 3
    • { P0964, P0966, P0967 } Terminal 2@Q77C Transmission Control Solenoid Valve 3-Electrical Connector & Control circuit terminal 20
    • { P0964, P0966, P0967 } Terminal 2@Q77D Transmission Control Solenoid Valve 4-Electrical Connector & Control circuit terminal 4
    • { P0964, P0966, P0967 } Terminal 2@Q77G Transmission Control Solenoid Valve 7-Electrical Connector & Control circuit terminal 18
    • { P0964, P0966, P0967 } Terminal 2@Q77H Transmission Control Solenoid Valve 8 -Electrical Connector & Control circuit terminal 2
    • If 2 Ω or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • If less than 2 Ω  , go to next step.
  23. Test for infinite resistance between the test points:
    • { P0960, P0962, P0963 } Terminal 2@Q77A Transmission Control Solenoid Valve 1-Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2@Q77B Transmission Control Solenoid Valve 2-Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2@Q77C Transmission Control Solenoid Valve 3-Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2@Q77D Transmission Control Solenoid Valve 4-Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2@Q77G Transmission Control Solenoid Valve 7-Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2@Q77H Transmission Control Solenoid Valve 8-Electrical Connector
    • If less than infinite resistance 

      Replace the component:Automatic Transmission Wiring Harness

    • If infinite resistance  , go to next step.
  24. Test for infinite resistance between the test points:
    • { P0960, P0962, P0963 } Control circuit terminal 19
    • { P0960, P0962, P0963 } Control circuit terminal 3
    • { P0960, P0962, P0963 } Control circuit terminal 20
    • { P0960, P0962, P0963 } Control circuit terminal 4
    • { P0960, P0962, P0963 } Control circuit terminal 18
    • { P0960, P0962, P0963 } Control circuit terminal 2
    • If less than infinite resistance 

      Replace the component:Automatic Transmission Wiring Harness

    • If infinite resistance  , Test or replace the component: Q77 Transmission Control Solenoid Valve.
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