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)

Or, hide this message: temporarily or permanently

Fuel Enable Output

The fuel enable circuit is a PASS-Key II module signal to the PCM. When the PASS-Key� II module sees the proper ignition key resistance, it sends a pulse width modulated (PWM) signal to the PCM. If the PASS-Key H module does not see the proper ignition key resistance, it does not send PWM signal to the PCM.