Automatic Transaxle Output Speed Sensor (A/T OSS)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 Suzuki Reno, 2008 Suzuki Forenza, 2007 Suzuki Reno, 2007 Suzuki Forenza, and 2006 Suzuki Reno. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle A/T OSS is a magnetic inductive pickup that relays information relative to vehicle speed to the TCM.
Vehicle speed information is used by the TCM to control shift timing, line pressure, and TCC (lock-up clutch) apply and release.
The output speed sensor mounts in the case at the speed sensor rotor, which is pressed onto the spur gear. An air gap of 0.1 - 1.3 mm (0.004 - 0.05 in.) is maintained between the sensor and the teeth on the spur gear teeth. The sensor consists of a permanent magnet surrounded by a coil of wire.
As the differential rotates, an AC signal is generated by the Output Speed Sensor (OSS).