Fuel Injection System
SYSTEM DESCRIPTION
Three types of fuel injection control are provided to accommodate engine operating conditions; normal control,
idle control and start control. The ECM determines the appropriate fuel injection control. Under each control,
the amount of fuel injected is compensated to improve engine performance. The ECM performs duty control
on the electric governor (built into the fuel injection pump) according to sensor signals to compensate the
amount of fuel injected to the preset value.
START CONTROL
Input/output signal line
Engine coolant temperature sensorcEngine coolant temperature
ECM
cElectric
governorCrankshaft position sensor (TDC)cEngine speed
Ignition switch
cStart signal
Control sleeve position sensor
cControl sleeve position
When the ECM receives a start signal from the ignition switch, the
ECM adapts the fuel injection system for the start control. The
amount of fuel injected at engine starting is a preset program value
in the ECM. The program is determined by the engine speed and
engine coolant temperature.
For better startability under cool engine conditions, the lower the
coolant temperature becomes, the greater the amount of fuel
injected. The ECM ends the start control when the engine speed
reaches 400 rpm (for M/T models), 600 rpm (for A/T models) and
shifts the control to the normal or idle control.
SEF648S
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
EC-15
