Mitsubishi 1992 3000GT, Service Manual

Page: 280 / 1308

MULTIPORT
On-Vehicle Inspection of MFI
FUEL INJECTION
ABS ECU
A ABS control unit
equipment side connector
ANTI-LOCK BRAKING SIGNAL
Engine control module connector
A
28
Engine
control
module
114
OPERATION
l
The anti-lock braking signal is input to the engine control module from the anti-lock braking system
(ABS) control module as a signal to indicate whether or not the motor relay is activated. Based
on this signal, the engine control module controls the idle air control motor to secure effective anti-lock
braking.
l
When the motor relay is activated, the ABS control unit turns ON the power transistor, short-circuiting
the terminal to ground. This causes the anti-lock braking signal to go from high to low.
HARNESS INSPECTION
Engine
control
side connector
Check for an open-circuit or a
short-circuit to ground, between
the ABS control unit and the en-
gine control module.
l
ABS control unit connector:
Disconnected
l
Engine control module con-
nector: Disconnected
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