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 Load Signal: Description and Operation

Engine Load Signal:

Used by the ignition ECU:
The engine load signal is supplied by the fuel injection ECU (1), which computes the intake manifold pressure (3) and intake air temperature (4) signals to generate the engine load signal.
This signal sent to the ignition ECU (2) is a digital (i.e. square wave pulses) output current (5) consisting of a duration proportional to the engine load.