Shaft Speed Sensors

Shaft Speed Sensors

Output Shaft Speed Monitor
It is possible for the TCM to diagnose electrical errors associated with the OSS sensor while the vehicle is stationary as well as moving. Plausibility monitoring is performed on the sensor output when the vehicle is moving.

The plausibility monitor runs continuously by checking the difference between the transmission output shaft speed and the calculated OSS gained from the road speed transmitted on the CAN. If the difference exceeds 510 RPM then the DTC is logged. Additionally if the maximum OSS exceeds its upper threshold then the DTC is also logged.

Input Shaft Speed Monitor
It is possible for the TCM to diagnose electrical errors associated with the ISS sensor while the vehicle is stationary as well as moving. Plausibility monitoring is performed on the sensor output when the vehicle is moving.

The plausibility monitor runs continuously by checking the difference between the transmission ISS and the engine speed gained from the road speed transmitted on the CAN. If the difference exceeds the defined threshold then the DTC is logged. Additionally if the maximum turbine speed exceeds its upper threshold then the DTC is also logged.