GENERATOR FR TERMINAL
Generator turns ON/OFF the power transistor in the voltage
regulator to adjust current flow in the field coil according to
alternator output current. In this way generator's output voltage
is kept adjusted (to about 14.7 V). The ratio of power transistor
ON time (ON duty) is output from generator FR terminal to ECM.
ECM uses this signal to detect generator's output current and
drives throttle actuator control motor according to output current
(electric load). This prevents change in idle speed due to electric
load and helps maintain stable idle speed.
ZK600269
FR
B
S
AA01
Field coil
IC regulator
Generator
ECM
Ignition switch-IG
Battery
13A-24
MULTIPORT FUEL SYSTEM (MFI)
SENSOR