Esteem L4-1590cc 1.6L SOHC 0 MFI 16V (1995)
Engine Control Module: Description and Operation
ECM Signals
Transmission Range Signal
This signal is sent from transmission control module as a battery voltage signal only when A/T is in "R", "D", "2" or "L" range. Thus, ECM judges
whether A/T is in one of the above range or otherwise (i.e. in "P" or "N" range) and uses it as one of the signals to control the fuel injector, idle speed
control valve and ignition control.
Electric Load Signal
This signal is sent from each circuit of head & small (or clearance) lights, heater fan and rear window defogger. ECM uses it as one of the factors for
controlling idle air control valve.
Ignition Fail Safe Signal
This signal is sent from the igniter. By monitoring this signal, the ECM detects whether the ignition spark is emitted or not and stops injector operation
when this signal is not inputted.
Engine Start Signal
This signal is sent from the engine starter circuit. By receiving it, ECM judges whether the engine is cranking or not and uses it as one of the signals to
control the fuel injector and fuel pump relay.