400SEL (140.043) V8-4.2L (119.971) (1993)
Engine Control Module: Description and Operation
Injection Control
Purpose and Location
LH Control Unit Diagram
PURPOSE
The LH Control module (N3/1) has a microprocessor that receives signals from various input devices regarding engine operating conditions. This
information is evaluated in relation to pre-programmed values and calculates the correct injector frequency (opening duration and injection timing)
to provide optimum performance, economy, and the least emissions output.