Suzuki Liana RH413, Service Manual

Page: 191 / 1302

Engine General Information and Diagnosis: 1A-140
6) Check that specified engine idle speed is obtained with A/C ON if vehicle is equipped with A/C.
If not, check A/C control circuits and idle air control system referring to “A/C Control System Check (Vehicle with A/
C)” and “Idle Air Control System Check”.
Engine idle speed and IAC duty
NOTE
Above duty values are ON duty (low voltage rate) meter indications.
Idle Mixture Inspection / Adjustment (Vehicle
without Heated Oxygen Sensor)
S3RH0A1106002
All vehicles not equipped with heated oxygen sensor are
shipped with their CO % factory adjusted as follows.
Idle mixture adjustment should never be changed from
the original factory setting. However, if during diagnosis,
the check indicates idle mixture to be the cause of a
driver performance complaint or emission failure, the idle
mixture can be adjusted using the following procedures.
Engine idle mixture (CO %)
0.5 – 1.5% at specified idle speed
NOTE
For this inspection and adjustment, exhaust
gas tester (CO meter) and engine tachometer
are necessary.
1) Check idle speed according to “Idle Speed / Idle Air
Control (IAC) Duty Inspection”.
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
resistor knob.
NOTE
Turning CO adjusting resistor knob to “A”
increases CO % (A/F mixture becomes rich)
and turning it to “B” decreases CO % (A/F
mixture becomes lean).
3) If idle mixture has been adjusted, confirm that idle
speed is within specification.
M13 engine vehicle
M16 engine vehicle with
A/T
M16 engine vehicle with
M/T
All electric parts turned OFF
and radiator cooling fan not
operated.
Transmission selector
lever in neutral position
Transmission selector
lever in “N” or “P” range
position
Transmission selector
lever in neutral position
700
±
50 r/min. (rpm)
IAC duty: 5 – 25%
660
±
50 r/min. (rpm)
IAC duty: 5 – 25%
Following items all turned
ON.
A/C switch, blower motor at
max position, rear defogger,
head light, radiator fan
operated at high speed.
Transmission selector
lever in neutral position
Transmission selector
lever in “P” or “D” range
position
Transmission selector
lever in neutral position
850
±
50 r/min. (rpm)
1. CO adjusting resistor
I3RH0A110054-01