4T80-E Automatic Transaxle
DTC P0717
Circuit Description
The automatic transmission input shaft speed sensor (AT ISS) is a permanent magnet generator. The AT ISS mounts in the transmission case facing the drive sprocket of the input shaft. As the drive sprocket rotates, an AC voltage is induced and transmitted to the transmission control module (TCM). The TCM converts the AC voltage into a digital signal. The TCM uses the input shaft speed signal to determine shift timing, torque converter clutch slip speed and gear ratio.
If the TCM detects a low input speed while the vehicle and engine speeds are high, 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 MAF DTCs P0101, P0102, P0103.
* No MAP DTCs P0106, P0107 or P0108.
* No OSS DTCs P0722 or P0723.
* DTC P0717 has passed this ignition cycle.
* The engine run time is greater than 5 seconds.
* Engine torque is 54 N.m (40 lb ft) or greater.
* The vehicle speed is 16 km/h (10 mph) or greater.
Conditions for Setting the DTC
The transmission input shaft speed is less than 100 RPM for 4.5 seconds.
Action Taken When the DTC Sets
* The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
* The TCM commands maximum line pressure.
* The TCM calculates input shaft speed from vehicle speed and commanded gear.
* The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records and the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
* The TCM stores DTC P0717 in TCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the MIL/DTC
* The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
* The TCM clears the DIC message when the condition no longer exists.
* 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 DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests the AT ISS for correct resistance.
8. This step tests the AT ISS high signal circuit for being shorted to another circuit within the transmission.
Step 1 - Step 8:
Step 9 - Step 14:
