Fuel Cut Operation; Emission Control System; Egr System (If Equipped) - Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual

6E2-46 ENGINE AND EMISSION CONTROL SYSTEM (H25 ENGINE)
1

Fuel cut operation

INSPECTION
NOTE:
Before inspection, check to make sure that gear shift
lever is in Neutral position (with A/T model, selector lever
in "P" range) and that parking brake lever is pulled all the
way up.
1) Warm up engine to normal operating temperature.
2) While listening to sound of injector by using sound scope (1)
or such, increase engine speed to higher than 3,000 r/min.
3) Check to make sure that sound to indicate operation of injec-
tor stops when throttle valve is closed instantly and it is
heard again when engine speed is reduced to less than
about 2,000 r/min.

Emission Control System

EGR system (if equipped)

SYSTEM INSPECTION [USING SUZUKI SCAN TOOL]
1) Connect SUZUKI scan tool to data link connector (DLC) (1)
with ignition switch OFF.
Special tool
(A) : SUZUKI scan tool
(A)
2) Start engine and warm up it to normal operating tempera-
ture.
3) With engine idling (without depressing accelerator pedal),
open EGR valve by using "MISC. TEST" mode.
In this state, according as EGR valve opening increases
engine idle speed drops. If not, possible cause is clogged
EGR gas passage, stuck or faulty EGR valve.
1. SUZUKI scan tool display
2. EGR valve opening (0 : Close, 100 : Full open)