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)

Or, hide this message: temporarily or permanently

Transmission Position Sensor/Switch: Description and Operation

This signal is sent to the Engine Control Module (ECM) from the Park/Neutral Position (PNP) switch whenever the manual selector lever is in the "P" or "N" position (automatic transmission models only). The ECM uses this signal as one of the signals to control fuel injection timing and Idle Air Control (IAC) valve operation.