6T70/6T75 - 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 Descriptors
DTC P0716
- Input Speed Sensor Performance
DTC P0717
- Input Speed Sensor Circuit Low Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The input speed sensor (ISS) is a hall-effect type sensor. The ISS mounts to the inside of the automatic transmission case assembly and connects to the control solenoid valve assembly through a 2-wire harness and connector. The sensor faces the reluctor wheel which is attached to the 4-5-6 clutch and 3-5-R clutch housing. The sensor receives 8.3-9.3 volts on the ISS supply voltage circuit from the transmission control module (TCM). As the 4-5-6 clutch and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the teeth of the reluctor wheel. This signal is transmitted through the ISS signal circuit to the TCM. The TCM uses the ISS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed, and gear ratio.
Conditions for Running the DTC
P0716
* No DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, P0752, P0973, or P0974.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is greater than 8.6 volts.
* The engine torque signal is valid.
* The throttle position signal is valid.
P0717
* No DTC P0717.
* The engine speed is greater than 400 RPM for 5 seconds.
* The ignition voltage is greater than 8.6 volts.
* The vehicle speed is greater than 16 km/h (10 mph).
* The engine torque is greater than 50 Nm (37 lb ft).
* DTC P0717 has not passed this ignition cycle.
Conditions for Setting the DTC
P0716
Transmission input speed drops 1,350 RPM for greater than 1.0 second.
P0717
Transmission input shaft speed is less than 50 RPM for 5.0 seconds.
Action Taken When the DTC Sets
* P0716 and P0717 are Type A DTCs.
* The TCM freezes transmission adaptive functions.
* The TCM commands the high side driver off.
* The TCM commands TCC off.
* The TCM commands maximum line pressure.
* The TCM disables neutral idle.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM allows the transmission to operate in reverse, third, and fifth range.
Conditions for Clearing the DTC
P0716 and P0717 are Type A DTCs.
Diagnostic Aids
Damage or misalignment of the 4-5-6 clutch and 3-5-R clutch housing reluctor machined teeth surface may cause a speed sensor malfunction.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference
* Component Connector End Views (Connector Views)
* Inline Harness Connector End Views (Connector End Views By Number)
Description and Operation
Electronic Component Description (Electronic Component Description) for input speed sensor (ISS)
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
Circuit/System Verification
1. Ignition ON, verify with a scan tool the transmission ISS/OSS Supply Voltage test status parameter displays OK.
2. Engine idling in Park, 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.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement (Control Valve Body Cover Replacement).
2. Connect the TCM harness connector.
3. Disconnect the ISS wiring harness connector X3 from the control solenoid valve assembly.
4. Ignition ON, test for 8.3-9.3 volts between the ISS voltage circuit terminal A, on the TCM assembly, and ground.
• If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (6T70/6T75 - Automatic Transmission).
5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test (Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test).
6. Inspect the reluctor for damage or misalignment. Repair or replace as necessary.
7. If all of the above test normal, replace the input speed sensor.
Repair Instructions
Important:
* Perform the Service Fast Learn Adapts (6T70/6T75 - Automatic Transmission) following all transmission related repairs.
Input Speed Sensor Replacement (Input Speed Sensor Replacement)
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming