Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE AND EMISSION CONTROL SYSTEM (G16/J20 ENGINES) 6E1-27
Idle mixture inspection/adjustment (vehicle without
heated oxygen sensor)
All vehicles not equipped with heated oxygen sensor are shipped
with their CO% factory adjusted as follows.
Engine idle mixture (CO%) at specified idle speed
0.8 – 1.3%
Idle mixture adjustment should never be changed from the origi-
nal factory setting. However, if during diagnosis, the check indi-
cates idle mixture to be the cause of a driver performance
complaint or emission failure, the idle mixture can be adjusted
using the following procedures.
1) Check idle speed according to “Idle Speed/Idle Air Control
(IAC) Duty Inspection” in this section.
2) Using exhaust gas tester, check that idle mixture CO% is
within above specification. If it is out of specification, adjust it
to specification by turning CO adjusting resistor knob (1).
3) If idle mixture has been adjusted, confirm that idle speed is
within specification.
NOTE:
For this inspection and adjustment, exhaust gas tester
(CO meter) and engine tachometer are necessary.