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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Engine Control Module: Description and Operation

PURPOSE
The Powertrain Control Module (PCM) detects engine operating and vehicle driving conditions along with exhaust gas oxygen content.

OPERATION
Various switches, sensors, and other components provide the PCM with information which allows it to control the amount of fuel injected into the engine. The PCM also has some control of the evaporative emission, ignition and deceleration systems.