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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Powertrain Control Module

Circuit Operation
The powertrain control module (PCM) receives inputs from switches and sensors, and controls the functions of transmission mode. The multi-plexed indicator control unit also controls the "POWER DRIVE", "WINTER DRIVE", "All OIL TEMP", and "CHECK TRANS" indicator lights and allows for diagnostic testing through the Data Link Connector, (DLC).