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Home >> Chevrolet >> 2019 >> Cruze Premier, 4D Hatchback >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Automatic Transmission - 9T50 (M3D) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2727, P2729, P2730, P2736, P2738, P2739, P2826, P2827, P282F, or P2830 >> 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: X1 @ T12 Automatic Transmission Assembly
  3. Connect a test lamp between the test points: Control circuit terminal 15 & 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: T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • T12 Automatic Transmission Assembly
    4. Test for infinite resistance between the test points: Control circuit terminal 15 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    5. Test for less than 2 ohms between the test points: Control circuit terminal 15 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K71 Transmission Control Module
    • If the test lamp is always On 
    1. Connect the electrical connector: T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • 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 15 @ 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. Verify DTC P0658, P0659 is not set.
    • If the DTC is set 

      Refer to step 9

    • Go to next step: If the DTC is not set 
  7. Connect a test lamp between the test points:
    • {P2727, P2729, P2730} Control circuit terminal 5 @ Component harness & Control circuit terminal 15 @ Component harness
    • {P2736, P2738, P2739} Control circuit terminal 4 @ Component harness & Control circuit terminal 15 @ Component harness
    • {P2826, P2827} Control circuit terminal 3 @ Component harness & Control circuit terminal 15 @ Component harness
    • {P282F, P2830} Control circuit terminal 2 @ Component harness & Control circuit terminal 15 @ Component harness
  8. Perform the scan tool control function: Transmission Control Solenoid Valve 5, 6, 9, 10 - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for less than 2 ohms between the test points:
      • {P2727, P2729, P2730} Control circuit terminal 5 @ Component harness & The other end of the circuit @ Control module harness
      • {P2736, P2738, P2739} Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
      • {P2826, P2827} Control circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness
      • {P282F, P2830} Control circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    4. Ignition - On/Vehicle - In Service Mode
    5. Test for less than 1 V between the test points:
      • {P2727, P2729, P2730} Control circuit terminal 5 @ Component harness & Ground
      • {P2736, P2738, P2739} Control circuit terminal 4 @ Component harness & Ground
      • {P2826, P2827} Control circuit terminal 3 @ Component harness & Ground
      • {P282F, P2830} Control circuit terminal 2 @ 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 is always On 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points:
      • {P2727, P2729, P2730} Control circuit terminal 5 @ Component harness & Ground
      • {P2736, P2738, P2739} Control circuit terminal 4 @ Component harness & Ground
      • {P2826, P2827} Control circuit terminal 3 @ Component harness & Ground
      • {P282F, P2830} Control circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K71 Transmission Control Module
    • Go to next step: If the test lamp turns On and Off 
  9. Remove the component: Control Valve Body Cover
  10. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  11. Disconnect the appropriate electrical connector: Q77 Transmission Control Solenoid Valve
  12. Connect a test lamp between the test points: Control circuit terminal 2 @ Component harness & Control circuit terminal 1 @ Component harness
  13. Perform the scan tool control function: Transmission Control Solenoid Valve 7, 8 - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp does not turn On and Off 

      Replace the component: Automatic Transmission Wiring Harness - (JUMPER)

    • Go to next step: If the test lamp turns On and Off 
  14. Test or replace the component: Q77 Transmission Control Solenoid Valve
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