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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 P0716, P0717, P07BF, P07C0, P1783 Or P17CE: Input Speed 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. Ignition - On / Vehicle - In Service Mode
  4. Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 8 & Ground
    • If less than 8.3 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 electrical connector: K71 Transmission Control Module
    5. Test for infinite resistance between the test points: 9 V Reference circuit terminal 8 @ 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: 9 V Reference circuit terminal 8 @ Component harness & Terminal 8 @ 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
    • If greater than 9.6 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 electrical connector: K71 Transmission Control Module
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: 9 V Reference circuit terminal 8 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K71 Transmission Control Module
    • Go to next step: If between 8.3 and 9.6 V 
  5. Ignition/Vehicle - Off
  6. Install the special tool: EL-38522  Variable Signal Generator
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
    • Black lead @ Ground
    • Red lead @ Signal circuit terminal 1
  7. Ignition - On / Vehicle - In Service Mode
  8. Verify the scan tool parameter:Transmission Input Speed = 442 to 462 RPM
    • If not between 442 to 462 RPM 
    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 electrical connector:K71 Transmission Control Module
    5. Ignition - On / Vehicle - In Service Mode
    6. Test for less than 1 V between the test points:Signal circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    7. Connect the electrical connector. X1 @ T12 Automatic Transmission Assembly
    8. Connect the electrical connector. K71 Transmission Control Module
    9. Ignition/Vehicle - Off
    10. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
    11. Disconnect the electrical connector: K71 Transmission Control Module
    12. Test for infinite resistance between the test points:Signal circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    13. Test for less than 2 Ω between the test points:Signal circuit terminal 1 @ Component harness & Terminal 12 @ 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 between 442 and 462 RPM 
  9. Connect the electrical connector. X1 @ T12 Automatic Transmission Assembly
  10. Ignition/Vehicle - Off
  11. Remove the component:Automatic Transmission Fluid Pan
  12. Disconnect the electrical connector: B14C Transmission Input Shaft Speed Sensor
  13. Connect the electrical connector. X1 @ T12 Automatic Transmission Assembly
  14. Ignition - On / Vehicle - In Service Mode
  15. Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 2 & Ground
    • If not between 8.3 and 9.6 V 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 8.3 and 9.6 V 
  16. Ignition Off
  17. Install the special tool: EL-38522  Variable Signal Generator
    • Set the voltage to 5 V
    • Set the frequency to 300 Hz
    • Set the duty cycle to 50%
    • Black lead @ Ground
    • Red lead @ Signal circuit terminal 1 (harness side)
  18. Ignition - On / Vehicle - In Service Mode
  19. Verify the scan tool parameter: Transmission Input Speed = 442 to 462 RPM
    • If not between 442 and 462 RPM 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If between 442 and 462 RPM 
  20. Test or replace the component:B14C Transmission Input Shaft Speed Sensor
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