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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 10L80 (MF6) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0711, P0712, P0713: Transmission Fluid Temperature Sensor >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
    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.
  2. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 26 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector:K71 Transmission Control Module
    2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 26 @ X1 & The other end of the circuit @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Test or replace the component: K71 Transmission Control Module
    • Go to next step: If less than 10 Ω 
  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 13 & 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 13 & Low Reference circuit terminal 26
  7. Verify the scan tool parameter:Transmission Fluid Temperature = Warmer than 149°C (300°F)
    • If colder than 149°C (300°F) 
    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 13 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 13 @ X1 & The other end of the circuit @ 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
    • Go to next step: If warmer than 149°C (300°F) 
  8. Ignition/Vehicle - Off
  9. Connect the electrical connector: K71 Transmission Control Module
  10. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  11. Remove the component:Automatic Transmission Fluid Pan
  12. Disconnect the electrical connector: X176
  13. Ignition - On / Vehicle - In Service Mode
  14. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 2 & Low Reference terminal 1 @ 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 
  15. Ignition/Vehicle - Off
  16. Remove the component: Control Valve Assembly
  17. Connect the electrical connector: X176
  18. Ignition - On / Vehicle - In Service Mode
  19. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 2 & Low Reference terminal 1 @ B13 Transmission Fluid Temperature Sensor
    • 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 
  20. Test or replace the component: B13 Transmission Fluid Temperature Sensor
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