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Tahoe / Yukon Service Manual

DTC P0716, P0717, P07BF, P07C0, P1783, or P17CE

Automatic Transmission - 10L80 MHS MQC | Diagnostic Information and Procedures | Document ID: 5224452 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P0716 Input Shaft Speed Sensor Performance DTC P0717 Input Shaft Speed Sensor Circuit No Signal DTC P07BF Input Shaft Speed Sensor Circuit Low DTC P07C0 Input Shaft Speed Sensor Circuit High DTC P1783 Input Shaft Speed Sensor Direction Not Plausible - Forward DTC P17CE Input Shaft Speed Sensor Direction Not Plausible Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
9 V Reference P07BF** P07BF** P07C0 P0716, P0717
Signal P07BF P07BF P07C0* P0716, P0717, P1783, P17CE
* Internal control module or component damage may occur if the circuit shorts to B+. ** Additional DTCs may set

Typical Scan Tool Data Input Shaft Speed Sensor

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Engine = Running Parameter Normal Range: 500 to 7,500 RPM
Signal 0 RPM 0 RPM 0 RPM

Sensor Supply Circuit Status

Circuit Short to Ground Open Short to Voltage
Operating Conditions: Ignition = On Parameter Normal Range: Okay
9 V Reference Malfunction Okay Malfunction

Circuit/System Description For an overview of the component/system, refer to: Electronic Component Description

Circuit Description
9 V Reference Regulated voltage supplied by the control module.
Signal The sensor produces a frequency modulated signal.
Component Description
B14C Automatic Transmission Input Speed Sensor The sensor contains a hall-effect sensor and additional electronics that processes the signal. It detects the change of strength of the magnetic field caused by the reluctor ring. When the strength changes, the sensor changes the amount of current it consumes. This results in a square wave signal of current and voltage. The control module detects the frequency in which the signal changes, which is proportional to the rotational speed.
K71 Transmission Control Module The control module contains a microprocessor used to process input data to control outputs. The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.
Reluctor Ring The reluctor ring has 40 teeth, magnetic segments, or indentations. The reluctor ring is part of the component: Input Shaft

The sensor is an input to the control module K71. The input signal is used to determine the rotational speed of the component: Input Shaft Conditions for Running the DTC P0716 DTC P0717, P07BF, P07C0 = Not set DTCs related to the following system/component = Not Set – B75 Mass Airflow Sensor – B107 Accelerator Pedal Position Sensor – Q14 Exhaust Gas Recirculation Valve – Q17 Fuel Injector – Engine Misfire – Fuel Trim System Accelerator Pedal Position Sensor = Greater than 4% Battery Voltage = Greater than 9 V Engine Torque = Greater than 30 Nm (22 lb ft) High Side Driver 1, 2 = On Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Output Shaft Speed Sensor = Greater than 239 RPM Transmission Service Fast Learn = Disabled Frequency the DTC runs = Continuously — After the running conditions are met P0717 DTC P0716, P07BF, P07C0 = Not set DTCs related to the following system/component = Not Set – B14A Automatic Transmission Output Speed Sensor – B65 Manifold Absolute Pressure and Intake Air Temperature Sensor – B75 Mass Airflow Sensor – B107 Accelerator Pedal Position Sensor – Q14 Exhaust Gas Recirculation Valve – Q17 Fuel Injector – Engine Misfire – Fuel Trim System Accelerator Pedal Position Sensor = Greater than 4% Battery Voltage = Greater than 9 V Brake Pedal Position = Less than 70% Engine Torque = Greater than 30 Nm (22 lb ft) Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Output Shaft Speed Sensor = Greater than a predefined threshold Transmission Service Fast Learn = Disabled Frequency the DTC runs = Continuously — After the running conditions are met P07BF, P07C0 { P07BF } DTC P07C0 = Not set { P07C0 } DTC P07BF = Not set Battery Voltage = Greater than 10 V Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Transmission Service Fast Learn = Disabled Frequency the DTC runs = Continuously — After the running conditions are met P1783 Battery Voltage = Greater than 9 V Engine Speed = Greater than 499 RPM Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Transmission Service Fast Learn = Disabled Frequency the DTC runs = Continuously — After the running conditions are met P17CE Battery Voltage = Greater than 9 V Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Input Shaft Speed Sensor = Greater than 224 RPM Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P0716 Input Speed Sensor = Decreases greater than 1999 RPM — For greater than 7.5 s P0717 Input Speed Sensor = Less than 169 RPM — For greater than 4 s P07BF Input Speed Sensor = Less than 0.25 V / Short to Ground — For greater than 1 s P07C0 Input Speed Sensor = Greater than 4.75 V / Short to Voltage — For greater than 1 s P1783 Condition 1 Current Gear = Forward Gear & Input Shaft Speed Sensor Direction = Reverse — For greater than 2.5 s Condition 2 Current Gear = Reverse Gear & Input Shaft Speed Sensor Direction = Forward — For greater than 2.5 s P17CE Input Speed Sensor Direction Signal = Not Plausible — For greater than 3.5 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Autostart/Autostop = Disabled — If equipped Grade braking = Disabled Neutral Idle Mode = Disabled Manual Shift Control = Disabled Powertrain braking = Disabled Tap Up & Tap Down = Disabled TCC Control = Disabled Transmission Adaptive Pressure Control = Freeze current adapt values Transmission gear allowed = Reverse or Gear 5 Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC Reference Information Schematic Reference Automatic Transmission Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Special Tools EL-38522 Variable Signal Generator Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify the scan tool parameter: Sensor Supply Circuit Status = Okay ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  3. Engine » Running
  4. Transmission » Park
  5. Verify the scan tool parameter: Input Shaft Speed Sensor = Engine Speed — The value should change smoothly and gradually as the engine speed is increased and decreased. ⇒ If not the specified value Refer to: Circuit/System Testing ⇓ If the specified value
  6. Drive Wheels » Blocked
  7. Parking Brake » Applied
  8. Transmission » Reverse
  9. Verify the scan tool parameter: Input Shaft Speed Sensor = 0 RPM ⇒ If not the specified state Refer to: Circuit/System Testing ⇓ If the specified state
  10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
  11. All OK. Circuit/System Testing
  12. Ignition/Vehicle & All vehicle systems » Off
  1. Disconnect the electrical connector: X1 @ T12 Automatic Transmission
  2. Ignition » On / Vehicle » In Service Mode
  3. 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 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K71 Transmission Control Module 4.3. 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 4.4. 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 4.1. Ignition/Vehicle » Off 4.2. Disconnect the electrical connector: K71 Transmission Control Module 4.3. Ignition » On / Vehicle » In Service Mode 4.4. 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 ⇓ If between 8.3 and 9.6 V
  4. Ignition/Vehicle » Off
  5. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 5 kHz Duty Cycle » 10% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 1
  6. Ignition » On / Vehicle » In Service Mode
  7. Verify the scan tool parameter: Input Shaft Speed Sensor = 7,400 to 7,600 RPM ⇒ If not between 7,400 and 7,600 RPM 8.1. Ignition/Vehicle » Off 8.2. Disconnect the electrical connector: K71 Transmission Control Module 8.3. Ignition » On / Vehicle » In Service Mode 8.4. 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 8.5. Ignition/Vehicle » Off 8.6. 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 8.7. 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 ⇓ If between 7,400 and 7,600 RPM
  8. Verify the scan tool parameter: Input Speed Sensor Direction = Forward ⇒ If not the specified state Replace the component: K71 Transmission Control Module ⇓ If the specified state
  9. Setup » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 600 Hz Duty Cycle » 10% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 1
  10. Verify the scan tool parameter: Input Speed Sensor Direction = Reverse ⇒ If not the specified state Replace the component: K71 Transmission Control Module ⇓ If the specified state
  11. Remove » EL-38522 Variable Signal Generator
  12. Connect the electrical connector. X1 @ T12 Automatic Transmission
  13. Ignition/Vehicle » Off
  14. Remove the component: Automatic Transmission Fluid Pan
  15. Disconnect the electrical connector: B14C Automatic Transmission Input Speed Sensor
  16. Ignition » On / Vehicle » In Service Mode
  17. 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 ⇓ If between 8.3 and 9.6 V
  18. Ignition/Vehicle » Off
  19. Install » EL-38522 Variable Signal Generator Voltage » 5 V Frequency » 5 kHz Duty Cycle » 10% Black lead @ Battery Negative Post Red lead @ Signal circuit terminal 1
  20. Ignition » On / Vehicle » In Service Mode
  21. Verify the scan tool parameter: Input Shaft Speed Sensor = 7,400 to 7,600 RPM ⇒ If not between 7,400 and 7,600 RPM Replace the component: Automatic Transmission Wiring Harness ⇓ If between 7,400 and 7,600 RPM
  22. Test or replace the component: B14C Automatic Transmission Input Speed Sensor Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Q77 Transmission Control Solenoid Valve Characterization Programming Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement Automatic Transmission Turbine Speed Sensor Replacement — B14C Automatic Transmission Input Speed Sensor Automatic Transmission Wiring Harness Replacement For control module replacement, programming, and setup refer to: Control Module References Additional Procedures Transmission Service Fast Learn Procedure — Perform only when the component/system is serviced.