6T70 (M7W) - 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 No Signal
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The input shaft speed (ISS) sensor is a hall-effect type sensor. The ISS sensor 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 sensor signal circuit to the TCM. The TCM uses the ISS sensor signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed, and gear ratio.
Conditions for Running the DTC
P0716
* DTC P0101, P0102, P0103, P0121, P0122, P0123, P0717, P0752, P0973, or P0974 is not set.
* Engine speed is 400-7,500 RPM for 5 s.
* Ignition voltage is greater than 8.5 V.
* Engine torque signal is valid.
* Throttle position signal is valid.
* Vehicle speed is 10 km/h (6 mph) or greater.
P0717
* DTC P0101, P0102, P0103, P0722, or P0723 is not set.
* Engine speed is 400-7,500 RPM for 5 s.
* Ignition voltage is greater than 8.5 V.
* Vehicle speed is 16 km/h (10 mph) or greater.
* Engine torque is 50 Nm (37 lb ft) or greater.
* Engine torque signal is valid.
Conditions for Setting the DTC
P0716
TCM detects the transmission input shaft speed signal dropped greater than 1350 RPM for 1 s.
P0717 - Condition 1
TCM detects the transmission input shaft speed signal is less than 33 RPM for 5 s.
P0717 - Condition 2
The TCM detects that P0722 set and the Transmission input speed is less than 1000 RPM for 5 s.
Action Taken When the DTC Sets
* DTCs P0716 and P0717 are Type A DTCs.
* TCM freezes transmission adaptive functions.
* TCM commands the high side driver OFF.
* TCM commands TCC OFF.
* TCM commands maximum line pressure.
* TCM disables neutral idle.
* TCM inhibits Tap Up/Down function.
* TCM inhibits manual shifting of forward gears.
* Torque management is enabled.
* TCM limits the transmission to Reverse and 3rd or 5th gear operation.
Conditions for Clearing the DTC
DTCs P0716 and P0717 are Type A DTCs.
Diagnostic Aids
If the scan tool ISS/OSS supply voltage parameter is out of range, the fault could also be caused by the transmission output shaft speed sensor.
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 6T70 (M7W) - Automatic Transmission
Connector End View Reference
* Component Connector End Views Sunshade - Left
* Inline Harness Connector End Views X110
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool ISS/OSS Supply Voltage parameter displays OK.
• IF OK is not displayed
Refer to Circuit/System Testing.
• If OK is displayed
3. Engine idling, transmission in Park, parking brake applied, and drive wheels chocked.
4. Verify the scan tool Transmission ISS parameter changes or does not drop out while varying the engine speed.
• If the Transmission ISS does not vary with engine speed or drops out
Refer to Circuit/System Testing.
• If the Transmission ISS varies with engine speed and does not drop out
5. 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.
6. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
7. All OK.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control valve body cover.
2. Connect the vehicle wire harness electrical connector to the Q8 Control Solenoid Valve Assembly electrical connector.
3. Disconnect the B14C Transmission Input Shaft Speed Sensor wiring harness connector from the Q8 Control Solenoid Valve Assembly.
4. Ignition ON.
5. Test for 8.3-9.3 V between the ISS sensor supply voltage circuit terminal A at the Q8 Control Solenoid Valve Assembly, and ground at the transmission case.
• If not between 8.3-9.3 V
1. Ignition OFF, disconnect the B14A Transmission Output Shaft Speed Sensor wiring harness connector from the Q8 Control Solenoid Valve Assembly. Ignition ON.
2. Test for 8.3-9.3 V between the OSS sensor supply voltage circuit terminal A X3 at the Q8 Control Solenoid Valve Assembly, and ground at the transmission case.
• If not between 8.3-9.3 V, replace the Q8 Control Solenoid Valve Assembly.
• If between 8.3-9.3 V, replace the B14A Transmission Output Shaft Speed Sensor.
• If between 8.3-9.3 V
6. Verify the scan tool Transmission ISS parameter is between 495-505 RPM when performing the input shaft speed test. Refer to 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.
• If not between 495-505 RPM
Replace the Q8 Control Solenoid Valve Assembly.
• If between 495-505 RPM
7. Verify there is no damage to the reluctor, which is attached to the 4-5-6 clutch and 3-5-R clutch housing assembly, or misalignment between the B14C Transmission Input Shaft Speed Sensor and reluctor.
• If the reluctor is damaged or misaligned
Repair or replace as necessary.
• If the reluctor is not damaged or misaligned
8. Replace the B14C Transmission Input Shaft Speed Sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repairs.
* Perform the Reset Transmission Adapts Reset Transmission Adapts following all transmission repairs.
* Input Speed Sensor Replacement Input Speed Sensor Replacement
* Output Speed Sensor Replacement Output Speed Sensor Replacement
* Control Valve Body Cover Replacement Control Valve Body Cover Replacement
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming, and setup.