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 Position Sensor/Switch: Description and Operation

This signal is sent to the PCM from the Transmission Range (TR) position switch. The PCM uses this signal as one of the inputs to modify fuel injection timing and Idle Air Control (IAC) Valve operation. The PCM also uses the TR switch signal for operation of automatic transmission.