P0717

DTC P0717: Input Speed Sensor (ISS) Circuit No Signal





Circuit Description
Information relative to transaxle input speed to the TCM. The TCM uses transaxle input speed information to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. The input speed sensor mounts onto piston B that is inside of valve body. An air gap of 1.8 - 2.2 mm (0.07 0.086 in.) is maintained between the sensor and the piston B.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the piston B is driven by the turbine shaft, an AC signal is induced by the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

Sensor resistance should measure between 825 - 835 Ohms at 20 °C (68 °F). Sensor can measure from 1,000 - 8,000 Hz.

Conditions for Setting the DTC
- Input speed is less than 100 rpm.
- Engine speed is greater than 2,000 rpm.
- Vehicle speed is greater than 30 km/h (18.6 mph).
- No output speed sensor error DTC P0722.
- No engine speed error DTC P0727.
- No CAN error DTCs U0073, U0100, U0101.
- System voltage is too high or too low.
- Input Speed Sensor (ISS) circuit is shorted to ground.
- ISS circuit is shorted to power.
- ISS circuit is open.
- CAN transmitting wiring harness shortage or open.
- TCM or ECM is defective.
- Immediately after the above condition occurs.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
- Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
- After ignition OFF/ON: 3rd gear by hydraulic control. Position P, R and N also possible.
- Open lock up clutch.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- Using a scan tool can clear history DTCs.

Diagnostic Aids
When DTC P0717 sets, the possible cause of fault could be ISS (input speed sensor).

Troubleshooting