P0717
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 Descriptors
DTC P0716
- Input Speed Sensor Performance
DTC P0717
- Input Speed Sensor Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The automatic transmission input speed sensor (ISS) is a permanent magnet with a coil of wire wound around it. The ISS mounts in the case cover facing the reluctor wheel of the input shaft. As the reluctor wheel is driven by the turbine shaft, an AC signal is induced in the input speed sensor. Higher vehicle speeds induce a higher frequency and a higher voltage at the sensor. There is a fixed air gap between the sensor and the teeth on the sensor reluctor wheel. The ISS input is used by the transmission control module (TCM) in order to control line pressure, torque converter clutch (TCC) apply and release, and transmission shift patterns. This sensor is also used to calculate the appropriate gear ratios and TCC slippage. This diagnostic indicates stuck, erratic, or intermittent conditions in the system.
Conditions for Running the DTC
P0716
* No TP sensor DTCs P0120 or P0220.
* No ISS DTC P0717.
* No OSS DTC P0722 or P0723.
* No 1-2 shift solenoid valve DTCs P0752, P0973, or P0974.
* The ISS is greater than 1050 RPM for at least 2 seconds.
* An increase in ISS is 500 RPM or less for at least 2 seconds.
* The calc. throttle position is 8 percent or more.
* The engine speed is greater than 500 RPM for 5 seconds.
* The vehicle speed is 16 km/h (10 mph) or greater.
* The engine torque is greater than 50 Nm (37 lb ft).
* Ignition voltage is 8.0-18.0 V.
P0717
* No ISS DTC P0717.
* No OSS DTC P0722 or P0723.
* The engine speed is greater than 500 RPM for 5 seconds.
* The vehicle speed is 16 km/h (10 mph) or greater.
* The engine torque is greater than 50 Nm (37 lb ft).
* Ignition voltage is 8.0-18.0 V.
Conditions for Setting the DTC
P0716
The input shaft speed changes by 1,000 RPM or more for 3.25 seconds.
P0717
The input shaft speed is less than 50 RPM for 4.5 seconds.
Action Taken When the DTC Sets
* DTCs P0716 and P0717 are type B DTCs.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM calculates input speed based on engine speed and gear ratio.
Conditions for Clearing the DTC
DTCs P0716 and P0717 are type B DTCs.
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, harness, connector, and TCM pins for metallic debris and input shaft machined face for damage or misalignment.
* 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.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)
Description and Operation
Electronic Component Description (Electronic Component Description)for input speed sensor 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
Control Module References (Programming and Relearning)for scan tool information
Special Tools
* J 38522 Variable Signal Generator
* J 44152 Jumper Harness (20 pins)
* J 44257 Main Wiring Harness Connector Remover
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.
2. 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.
Circuit/System Testing
Important: Additional DTCs may set when disconnecting the automatic transmission inline 20-way connector.
1. Ignition OFF, using the main wiring harness connector remover J 44257 , disconnect the automatic transmission (AT) inline 20-way connector and install the jumper harness J 44152 on the engine side of the AT inline 20-way connector.
2. Ignition ON. Engine OFF.
3. Using the L-BU probes J 35616-64B, test for 2.0-3.0 V between the ISS high signal circuit, jumper harness terminal S and a good ground, such as the ground terminal of the EL-49742 harness, black terminal.
• If greater than the specified value, test the ISS high signal circuit for a short to voltage. If all circuits and connections test normal, test the TCM.
• If less than the specified value, test the ISS high signal circuit for an open/high resistance, short to ground or short to the ISS low signal circuit. If all circuits and connections test normal, test the TCM.
• If 2.0-3.0 V.
4. Using the L-BU probes J 35616-64B, test for 2.0-3.0 V between the ISS low signal circuit, jumper harness terminal V and a good ground, such as the ground terminal of the EL-49742 harness, black terminal.
• If greater than the specified value, test the ISS low signal circuit for a short to voltage. If all circuits and connections test normal, test the TCM.
• If less than the specified value, test the ISS low signal circuit for an open/high resistance, short to ground or short to ISS high signal circuit. If all circuits and connections test normal, test the TCM.
• If 2.0-3.0 V.
5. Using the L-BU probes J 35616-64B, test for greater than 10K ohm between the ISS high signal circuit, jumper harness terminal S, and all other circuits of the jumper harness J 44152 .
• If less than the specified value, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCM.
• If greater than 10K ohm.
6. Using the L-BU probes J 35616-64B, test for greater than 10K ohm between the ISS low signal circuit, jumper harness terminal V, and all other circuits of the jumper harness J 44152 .
• If less than the specified value, test the affected circuits for a shorted together condition. If all circuits and connections test normal, test the TCM.
• If greater than 10K ohm.
7. Test the ISS for proper operation.
Component Testing
ISS
1. Ignition OFF.
2. Using the main wiring harness connector remover J 44257 , disconnect jumper harness J 44152 from the engine side of the AT inline 20-way connector.
3. Install jumper harness J 44152 to the AT 20-way pass-thru connector.
4. Using the L-BU probes J 35616-64B, test for 625-835 ohm between the ISS high signal circuit, jumper harness terminal S and the ISS low signal circuit, jumper harness terminal V. Refer to the Component Resistance (Component Resistance) chart.
• If greater than the specified value, test the affected circuits for an open/high resistance condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the ISS.
• If less than the specified value, test the affected circuits for a shorted together condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the ISS.
• If 625-835 ohm.
5. Using the L-BU probes J 35616-64B, test for greater than 1M ohm between the ISS high signal circuit, jumper harness terminal S and all other circuits of the jumper harness J 44152 except the ISS low signal circuit, jumper harness terminal V.
• If less than the specified value, test the affected circuits for a shorted together condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the ISS.
• If greater than 1M ohm.
6. Using the L-BU probes J 35616-64B, test for greater than 1M ohm between the ISS low signal circuit, jumper harness terminal V and all other circuits of the jumper harness J 44152 except the ISS high signal circuit, jumper harness terminal S.
• If less than the specified value, test the affected circuits for a shorted together condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the ISS.
• If greater than 1M ohm.
7. Test for greater than 10M ohm between the following circuits and the transmission case:
* ISS high signal circuit, ISS pin S
* ISS low signal circuit, ISS pin V
• If less than the specified value, test the affected circuit for short to the transmission case. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits test normal, replace the ISS.
• If greater than 1M ohm.
8. With the engine running and using the L-BU probes J 35616-64B, observe the AC voltage between the ISS high signal circuit, jumper harness terminal S and the ISS low signal circuit, jumper harness terminal V. While varying the engine speed, the AC voltage should change with the engine speed and not drop out.
• If the AC voltage does not perform as described, test the affected circuits for an open/high resistance condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the ISS.
• If AC voltage performs as described.
9. Test the TCM for proper operation.
TCM
1. Ignition OFF.
2. Install jumper harness J 44152 to the engine side of the AT inline 20-way connector. Connect a scan tool.
3. Ignition ON. Engine OFF.
4. Using the L-BU probes J 35616-64B, connect the variable signal generator J 38522 between the ISS high signal circuit, jumper harness terminal S and the ISS low signal circuit, jumper harness terminal V. Set signal to 30V. Frequency to 30 Hz. Duty cycle to 50 percent.
5. While monitoring the Transmission ISS parameter on the scan tool vary the frequency. As the frequency increases the ISS parameter should increase. As the frequency decreases the ISS parameter should decrease. The Variable Signal Generator J 38522 when set to 30V will vary the ISS parameter RPM from about 40 RPM at 30 Hz to 6800 RPM at 5000 HZ. Refer to ISS parameter/RPM in the Typical Readings Using the Variable Signal Generator J 38522 chart below.
• If the ISS parameter does not perform as described, test the affected circuits for an open/high resistance condition. If a circuit is shorted or open replace the internal transmission wiring harness assembly, if all circuits and connections test normal replace the TCM.
• If AC voltage performs as described.
6. Test the ISS for proper operation.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Control Module References (Programming and Relearning)for TCM replacement, setup, and programming
* Input Speed Sensor Removal (22. Input Speed Sensor Removal)and Input Speed Sensor Installation (83. Input Speed Sensor Installation)
- Channel Plate and Gasket Removal (19. Channel Plate and Gasket Removal)for ISS Replacement
- Side Cover/Gaskets, Disassemble, Assemble, Install (100. Side Cover/Gaskets, Disassemble, Assemble, Install)for ISS Replacement
- Control Valve Body Assembly Removal (15. Control Valve Body Assembly Removal)for ISS Replacement
* Wiring Harness Replacement (Service and Repair)