Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Transmission Speed Sensor: Description and Operation

The Transmission Speed Sensor (TSS), located within the transaxle oil pan, produces an AC voltage that is proportional to the speed of the transaxle's forward/reverse drum. Since this drum is mechanically connected to the torque converter, the sensor is also measuring turbine speed. The Electronic Control Assembly (ECA) uses this input to determine upshift and downshift points.