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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 P0721-P0723, P077C, or P077D >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 7 & Ground
    • If less than 8.3 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    4. Disconnect the electrical connector: X1 @ K71 Transmission Control Module
    5. Test for infinite resistance between the test points: 9 V Reference circuit terminal 7 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    6. Test for less than 2 ohms between the test points: 9 V Reference circuit terminal 7 @ Component harness & Terminal 7 @ 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 greater than 9.6 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Clear DTCs
    3. Ignition/Vehicle - Off
    4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    5. Disconnect the electrical connector: K71 Transmission Control Module
    6. Ignition - On/Vehicle - In Service Mode
    7. Test for less than 1 V between the test points: 9 V Reference circuit terminal 7 @ 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 between 8.3 and 9.6 V 
  5. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  8. Install the special tool: EL-38522 Variable Signal Generator
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
    • Black lead @ Battery Negative Post
    • Red lead @ Signal circuit terminal 6
  9. Ignition - On/Vehicle - In Service Mode
  10. Verify the scan tool parameter: Transmission OSS = 640 to 700 RPM
    • If not between 640 and 700 RPM 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector: X1 @ 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: Signal circuit terminal 6 @ 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
    7. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    8. Ignition/Vehicle - Off
    9. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    10. Test for infinite resistance between the test points: Signal circuit terminal 6 @ 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 less than 2 ohms between the test points: Signal circuit terminal 6 @ Component harness & Terminal 14 @ 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
    • Go to next step: If between 640 and 700 RPM 
  11. Remove the component: Transmission Cover
  12. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  13. Ignition/Vehicle - Off
  14. Disconnect the electrical connector: B14A Transmission Output Shaft Speed Sensor
  15. Ignition - On/Vehicle - In Service Mode
  16. Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 1 & Ground
    • If not between 8.3 and 9.6 V 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 8.3 and 9.6 V 
  17. Ignition Off
  18. Install the special tool: EL-38522 Variable Signal Generator
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
    • Black lead @ Battery Negative Post
    • Red lead @ Signal circuit terminal 2
  19. Ignition - On/Vehicle - In Service Mode
  20. Verify the scan tool parameter: Transmission OSS = 640 to 700 RPM
    • If not between 640 and 700 RPM 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 640 and 700 RPM 
  21. Replace the component: B14A Transmission Output Shaft Speed Sensor
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