Owner`s manual

IDLE AIR CONTROL SYSTEM
The idle speed of an engine may be affected
by a number of conditions. For example, a
cold engine is inclined to run sluggishly at
idle as well as under load. Such accessories
as air conditioning and power steering may
load the engine during idle and bring the idle
speed down. Accessories that draw a large
amount of current from the alternator, such as
headlamps, window defoggers, radiator fans,
etc., increase the load on the engine. So, to
provide smooth idle under all conditions, and
to provide the best overall fuel economy, the
ECCS system gives computer controlled, au-
tomatic idle speed control. Using the infor-
mation provided by the sensors, the ECM
calculates the best idle speed and brings it
about through the IACV-AAC valve, which
allows more, or less, air into the intake
manifold. Because the air is measured by the
mass air flow sensor, the injectors always
follow along with the correct pulse duration,
so the mixture is always correct.
ON-BOARD DIAGNOSTIC SYS-
TEM
The ECM (engine control module) has an
on-board diagnostic system function, which
monitors the engine and automatic transmis-
sion related circuits/components for prob-
lems. If the ECM senses a problem, it stores
the information for retrieval by an experienced
INFINITI technician at your dealership. So
diagnosis and repair, even of this sophisti-
cated system, may be made easier and more
accurate.
TECHNICAL AND CONSUMER INFORMATION
9-6
Z 96.12.20/ X