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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0707, P0708, P2802, P2803, or P2805 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. 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: X1 @ T12 Automatic Transmission Assembly
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 10 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 10 @ Component harness & Terminal 23 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 11 & Low Reference circuit terminal 10
    • If less than 4.8 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 appropriate electrical connector: K20 Engine Control Module
    5. Test for infinite resistance between the test points: 5 V Reference circuit terminal 11 @ 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: 5 V Reference circuit terminal 11 @ Component harness & Terminal 39 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • If greater than 5.2 V 
    1. Disconnect the appropriate electrical connector: K20 Engine Control Module
    2. Ignition - On / Vehicle - In Service Mode
    3. Test for less than 1 V between the test points: 5 V Reference circuit terminal 11 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  9. Install - EL-38522 Variable Signal Generator
    • Voltage - 5 V
    • Frequency - 300 Hz
    • Duty Cycle - 50%
    • Red lead @
      • { P0707, P0708 } Signal circuit terminal 9
      • { P2802, P2803 } Signal circuit terminal 8
    • Black lead @ Ground
  10. Ignition - On / Vehicle - In Service Mode
  11. Verify the scan tool parameter:

    Transmission Range Sensor 1, 2 = 48 to 52%

    • If not between 48 and 52% 
    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 appropriate electrical connector:
      • { P0707, P0708 }K71 Transmission Control Module
      • { P2802, P2803 }K20 Engine Control Module
    5. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    6. Ignition - On / Vehicle - In Service Mode
    7. Test for less than 1 V between the test points:
      • { P0707, P0708 } Signal circuit terminal 9 @ Component harness & Ground
      • { P2802, P2803 } Signal circuit terminal 8 @ 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
    8. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    9. Ignition/Vehicle - Off
    10. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    11. Test for infinite resistance between the test points:
      • { P0707, P0708 } Signal circuit terminal 9 @ Component harness & Ground
      • { P2802, P2803 } Signal circuit terminal 8 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    12. Test for less than 2 ohms between the test points:
      • { P0707, P0708 } Signal circuit terminal 9 @ Component harness & The other end of the circuit
      • { P2802, P2803 } Signal circuit terminal 8 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:
      • { P0707, P0708 }K71 Transmission Control Module
      • { P2802, P2803 }K20 Engine Control Module
    • Go to next step: If between 48 and 52% 
  12. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  13. Ignition/Vehicle - Off
  14. Remove the component: Control Valve Body Cover
  15. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  16. Disconnect the electrical connector: B15 Transmission Internal Mode Switch
  17. Install - EL-38522 Variable Signal Generator
    • Voltage - 5 V
    • Frequency - 300 Hz
    • Duty Cycle - 50%
    • Black lead @ Ground
    • Red lead @
      • { P0707, P0708 } Signal circuit terminal 2
      • { P2802, P2803 } Signal circuit terminal 4
  18. Ignition - On / Vehicle - In Service Mode
  19. Verify the scan tool parameter: Transmission Range Sensor 1 & Transmission Range Sensor 2 = 48 to 52%
    • If not between 48 and 52% 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 48 and 52% 
  20. Test or replace the component: B15 Transmission Internal Mode Switch
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