Operation CHARM: Car repair manuals for everyone.
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 from the A/T control module as a battery voltage signal only when the A/T is in "R," "D," "2" or "L," range. Thus, the ECM judges whether the A/T is in one of the above ranges or in "P" or "N," and uses it as one of the signals to control the fuel injector and ISC solenoid valve.