P0716

DTC P0716: Input Speed Sensor (ISS) Circuit Range Performance





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
- The increasing rate of the turbine speed is more than 25,000 rpm/sec.
- The increasing rate of the turbine speed is less than -25,000 rpm/sec.
- System voltage is greater than 8.5 V.
- Engine is running.
- No engine speed error DTCs P0727.
- Gear position is D.
- 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 P0716 sets, the possible cause of fault could be ISS (input speed sensor).

Troubleshooting