Automatic Transaxle Input Speed Sensor (A/T ISS)

The A/T ISS is a magnetic inductive pickup that relays 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 induced in the input speed sensor.

Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

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