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

Speed Control

The speed control system provides five separate voltages (inputs) to the Powertrain Control Module (PCM). The voltages correspond to the ON/OFF, SET, RESUME and CANCEL.
- The speed control ON voltage informs the PCM that the speed control system has been activated.
- The speed control SET voltage informs the PCM that a fixed vehicle speed has been selected.
- The speed control RESUME voltage indicates the previous fixed speed is requested.
- The speed control CANCEL voltage tells the PCM to deactivated but retain set speed in memory (same as depressing the brake pedal).
- The speed control OFF voltage tells the PCM that the speed control system has deactivated.