LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - 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 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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: X175Inline Harness Connector @ 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 @ X175Inline Harness Connector & 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 @ X175Inline Harness Connector & 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 = 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 @ X175Inline Harness Connector & 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 @ X175Inline Harness Connector
  7. Verify the scan tool parameter: Transmission Fluid Temperature = Warmer than 129°C (264°F)
    • If 129°C (264°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 @ X175Inline Harness Connector & 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 13 @ X175Inline Harness Connector & 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 129°C (264°F) 
  8. Ignition/Vehicle - Off
  9. Connect the electrical connector: X175Inline Harness Connector @ 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 14 & Low Reference terminal 16 @ X176
    • 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 Transmission Fluid Temperature Sensor
scientia non olet · About LEMON Manuals