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

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Electronic Control Assembly (ECA)


The Electronic Control Assembly (ECA) receives ignition ground and Profile Ignition Pickup (PIP) signals from the EDIS module then generates a Spark Angle Word (SAW) output signal based on fuel, air and other sensor information. An IDM signal is received from the EDIS module to determine if a failure mode should be recorded. For diagnosis and testing of the ECA refer to "COMPUTERIZED ENGINE CONTROLS".