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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 P0707, P0708, P2802, P2803 Or P2805: Transmission Range 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 20 & Ground
    • If 10 Ω or greater 
    1. Disconnect the electrical connector:K20 Engine Control Module
    2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 20 @ Component harness & The other end of the circuit
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • Go to next step: If less than 10 Ω 
  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 12 & Low Reference circuit terminal 20
    • If less than 4.8 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector: K20 Engine Control Module
    4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    5. Test for infinite resistance between the test points: 5 V Reference circuit terminal 12 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    6. Test for less than 2 Ω between the test points: 5 V Reference circuit terminal 12 @ Component harness & The other end of the circuit
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component:K20 Engine Control Module
    • If greater than 5.2 V 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector: K20 Engine Control Module
    4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: 5 V Reference circuit terminal 12 @ 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. Verify the scan tool parameter:Transmission Range Sensor 1, 2 = 100%
    • If less than 100% 
    1. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the appropriate electrical connector:K20 Engine Control Module
    4. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    5. Test for infinite resistance between the test points:
      • {P0707, P0708} Signal circuit terminal 5 & Ground
      • {P2802, P2803} Signal circuit terminal 6 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • {P0707, P0708} If infinite resistance - Replace the component:K71 Transmission Control Module
      • {P2802, P2803} If infinite resistance - Replace the component:K20 Engine Control Module
    • Go to next step: If 100% 
  7. Connect a 3 A fused jumper wire between the test points:
    • {P0707, P0708} Signal circuit terminal 5 & Low Reference circuit terminal 20
    • {P2802, P2803} Signal circuit terminal 6 & Low Reference circuit terminal 20
  8. Verify the scan tool parameter: Transmission Range Sensor 1, 2 = 0%
    • If greater than 0% 
    1. Remove - Jumper Wire
    2. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    3. Ignition/Vehicle - Off
    4. Disconnect the appropriate electrical connector: 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:Ground &
      • {P0707, P0708} Signal circuit terminal 5 & Ground
      • {P2802, P2803} Signal circuit terminal 6 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    8. Ignition/Vehicle - Off
    9. Test for less than 2 Ω between the test points:
      • {P0707, P0708} Signal circuit terminal 5 & The other end of the circuit
      • {P2802, P2803} Signal circuit terminal 6 & The other end of the circuit
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • {P0707, P0708} If less than 2 Ω - Replace the component:K71 Transmission Control Module
      • {P2802, P2803} If less than 2 Ω - Replace the component:K20 Engine Control Module
    • Go to next step: If 0% 
  9. Remove the component:Automatic Transmission Fluid Pan
  10. Disconnect the component:B303 Transmission Range Sensor
  11. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
  12. Test for less than 10 Ω between the test points:Low Reference circuit terminal 1 @ Component harness & Ground
    • If greater than 10 Ω 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 10 Ω 
  13. Test for 4.8 to 5.2 V between the test points:
    • Signal circuit terminal 2 @ Component harness & Ground
    • Signal circuit terminal 3 @ Component harness & Ground
    • 5 V Reference circuit terminal 4 @ Component harness
    • If less than 4.8 V or If greater than 5.2 V 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 4.8 and 5.2 V 
  14. Test or replace the component: B303 Transmission Range Sensor
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