4L60-E/4L65-E/4L70-E - Automatic Transmission
DTC P0716 or P0717
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0716
- Input Speed Sensor Performance
DTC P0717
- Input Speed Sensor Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The input speed sensor (ISS) is a permanent magnet generator. The ISS mounts in the transmission case in front of the valve body assembly. The sensor faces the input (turbine) shaft machined teeth surface. As the input (turbine) shaft rotates, an AC voltage is induced and transmitted to the transmission control module (TCM). The AC voltage level and the number of pulses increase as the speed of the input (turbine) shaft increases. The TCM converts the AC voltage into a digital signal. The TCM uses the input shaft speed signal to help determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.
Conditions for Running the DTC
P0716
* No TP sensor DTC P0120.
* No ISS DTC P0717.
* No output speed sensor (OSS) DTCs P0722 or P0723.
* No Shift Solenoid DTCs P0757, P0973, P0974.
* The engine torque is at least 50 Nm (37 lb ft).
* The vehicle speed is 16 km/h (10 mph) or greater.
* The transmission input shaft speed is greater than 1,050 RPM for 2 seconds.
* The throttle position is at least 8 percent.
* One of the following conditions exist:
- The transmission input shaft speed has not decreased more than 1,050 RPM for at least 2 seconds.
- The transmission input shaft speed has increased by greater than 500 RPM within 2 seconds.
P0717
* No ISS DTC P0717.
* No OSS DTCs P0722 or P0723.
* The vehicle speed is greater than 16 km/h (10 mph).
* The engine torque is at least 50 Nm (37 lb ft).
Conditions for Setting the DTC
P0716
The change in transmission input shaft speed is 1,000 RPM or more for 4 seconds.
P0717
The transmission input shaft speed is less than 50 RPM for 5 seconds.
Action Taken When the DTC Sets
* DTC P0716 and P0717 are Type B DTCs.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adapts.
* The TCM calculates input speed from the automatic transmission output shaft speed sensor and commanded gear.
Diagnostic Aids
* DTC P0716 detects a large change in the input speed signal in a very short period of time; an unrealistic change indicates an intermittent fault.
* DTC P0717 detects a very low input speed when the vehicle speed is greater than a calibrated value indicates a continuous fault.
* Inspect the ISS, wire harness, connector, and TCM for metallic debris, damage, or misalignment. Ensure the wiring harness is not stretched too tightly or other components are pressing on the automatic transmission inline 20-way connector body. Also inspect for proper clearance to any other components and wiring.
* Inspect the input shaft machined face for damage or misalignment. Proper torque of the ISS mounting bolt is critical to proper ISS operation.
* Inspect the input shaft machined face for damage or misalignment. Proper torque of the ISS mounting bolt is critical to proper ISS operation.
* Use a terminal test kit for any test that requires probing the TCM harness connector, the 20-way connector, or a component harness connector.
* Road test the vehicle while monitoring the Transmission ISS parameter on the scan tool. The Transmission ISS parameter should vary with engine speed changes and not abruptly drop out.
* Inspect for an open or shorted AT ISS wire.
* Inspect for a disconnected AT ISS connector.
* Inspect for a faulty AT ISS.
Conditions for Clearing the DTC
DTCs P0716 and P0717 are Type B DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 4L60-E/4L65-E/4L70-E - Automatic Transmission
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Transmission General Information Transmission General Information
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Transmission Control Module Scan Tool Information (Allison) Scan Tool Testing and ProceduresTransmission Control Module Scan Tool Information (4L60-E) Scan Tool Testing and ProceduresTransmission Control Module Scan Tool Information (2ML70) Scan Tool Testing and ProceduresTransmission Control Module Scan Tool Information (6L45/6L50/6L80/6L90) Scan Tool Testing and Procedures
Special Tools
* J 38522 - Variable Signal Generator
* J 44152 - Jumper Harness (20 Pins)
Circuit/System Verification
1. Engine running, observe the scan tool Transmission ISS parameter while varying the engine speed. The Transmission ISS parameter should change with the engine speed and not drop out.
• If the engine speed does not change with engine speed or drops out
Refer to Circuit/System Testing.
• If the engine speed changes with engine speed or does not drop out
2. Verify DTC P0716 or P0717 is only set as a history DTC.
• If the DTC is set as current
Refer to Circuit/System Testing.
• If the DTC is set as history
Note: After inspection, apply Nyogel lubricant 760G to each connector terminal. Ensure each connector and CPA is correctly seated.
3. Visually inspect each connector terminal of the automatic transmission 20-way connector and the transmission control module for damage or corrosion. Repair as necessary.
4. 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. The DTC should not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
5. All OK.
Circuit/System Testing
Note: Additional DTC's may set when disconnecting the automatic transmission inline 20-way connector.
1. Ignition OFF, disconnect the AT harness connector at the transmission.
2. Install the J 44152 - harness (20 Pins)on the engine side of the AT inline 20-way connector.
3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal E and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
4. Ignition OFF, connect the red lead of the J 38522 - generator to the signal circuit terminal K. Connect the battery voltage supply to B+, and ground the black lead.
5. Set the J 38522 - generatorsignal to 12 volts, the Frequency to 300, and the Duty Cycle to 50 percent.
6. Ignition ON, observe the scan tool Transmission ISS parameter. The scan tool Transmission ISS parameter should be between 500-700 RPM.
• If not within the specified range, test the signal circuit for a short to voltage, a short to ground, or an open/high resistance. If the circuit tests normal, replace the TCM.
7. Ignition OFF, remove the transmission oil pan.
8. Test the internal transmission wiring harness for the ISS for the conditions listed below. The circuits should test normal.
* Open
* Short to ground
* Short to voltage
• If you find a condition, replace the internal transmission wiring harness. Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness Service and Repair.
9. If all circuits test normal, test or replace the input speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Input Speed Sensor Removal Input Speed Sensor Removal and Input Speed Sensor Installation Input Speed Sensor Installation
* Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness Service and Repair
* Control Module References Control Module References for TCM replacement, setup, and programming