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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Automatic Transmission - 8L45 (M5N) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0711-P0713 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
    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: X175 @ T12 Automatic Transmission Assembly
    3. NOTE:

    Testing for steps 3 to 7 is performed on the control module K71 side of the harness connector.

  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 11 @ Component harness & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K71 Transmission Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 11 @ 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
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Transmission Fluid Temperature Sensor = Colder than -39°C (-38°F)
    • If -39°C (-38°F) or warmer 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 12 @ 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 colder than -39°C (-38°F) 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 12 & Low Reference circuit terminal 11 @ Component harness
  7. Verify the scan tool parameter: Transmission Fluid Temperature Sensor = Warmer than 169°C (336°F)
    • If 169°C (336°F) or colder 
    1. Ignition/Vehicle - Off & Remove - Jumper wire (s)
    2. Disconnect the electrical connector: K71 Transmission Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 12 @ 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
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 12 @ 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
    • Go to next step: If warmer than 169°C (336°F) 
  8. Ignition/Vehicle - Off
  9. Connect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  10. Remove the component: Automatic Transmission Fluid Pan
  11. Disconnect the electrical connector: X176
  12. Ignition - On / Vehicle - In Service Mode
    13. NOTE:

    Testing for steps 13 to 17 is performed on the control module K71 side of the harness connector.

  13. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 15 & Low Reference terminal 16 @ Component harness
    • If not between 4.8 and 5.2 V 

      Replace the appropriate component: Automatic Transmission Wiring Harness

    • Go to next step: If between 4.8 and 5.2 V 
  14. Test or replace the component: B13 Automatic Transmission Fluid Temperature Sensor
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