P0717
DTC P0717
Circuit 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 reverse clutch housing machined teeth surface. As the reverse clutch housing 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 reverse clutch housing 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.
If the TCM detects no input shaft speed when there is vehicle speed in a drive gear range, then DTC P0717 sets. DTC P0717 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0717 Input Speed Sensor Circuit Low Voltage
Conditions for Running the DTC
* No OSS DTCs P0722 or P0723.
* No ISS DTC P0717.
* No engine torque DTC P2637.
* The engine run time is greater than 5 seconds.
* The vehicle speed is at least 16 km/h (10 mph).
Conditions for Setting the DTC
The transmission input shaft speed is less than 100 RPM for 5 seconds.
Action Taken When the DTC Sets
* The TCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
* The TCM commands TCC OFF.
* The TCM inhibits torque management.
* Max gear inhibited in Hot Mode.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM calculates input shaft speed from the output shaft speed sensor and commanded gear.
* At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
* At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
* The TCM stores DTC P0717 in TCM history.
Conditions for Clearing the MIL/DTC
* The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.
* A scan tool can clear the MIL/DTC.
* The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
* The TCM cancels the default actions when the ignition is OFF long enough in order to power down the TCM.
Diagnostic Aids
Ensure the ISS is properly torqued to the transmission housing.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. The resistance measurement will not change if either the ISS high signal circuit or the ISS low signal circuit, but not both, is shorted to ground. The vehicle speed detector in the TCM and the ISS are matched in such a way that an open or a short to ground in the ISS low signal circuit will not usually cause a loss of speed signal or a DTC P0717 to set.
6. This step isolates the short between the ISS and the wiring.
11. Refer to the latest procedures for TCM reprogramming.
Step 1 - Step 6:
Step 7 - Step 12:
