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1A-198 Engine General Information and Diagnosis:
Idle Speed / Idle Air Control (IAC) Duty
Inspection
Before idle speed / IAC duty check, make sure of the
following.
• Lead wires and hoses of electronic fuel injection and
engine and emission control systems are connected
securely.
• Accelerator cable has some play, that is, it is not tight.
• Valve lash is checked according to maintenance
schedule.
• Ignition timing is within specification.
• All accessories (wipers, heater, lights, A/C, etc.) are
out of service.
• Air cleaner has been properly installed and is in good
condition.
• No abnormal air drawn in from air intake system.
After all items are confirmed, check idle speed and IAC
duty as follows.
NOTE:
Before starting engine, place transmission
gear shift lever in "Neutral" (shift selector
lever to "P" range for A/T vehicle), and set
parking brake and block drive wheels.
1) Connect SUZUKI scan tool to DLC (1) with ignition
switch turned OFF.
Special tool
(A): SUZUKI scan tool
1
Repair Instructions
2) Warm up engine to normal operating temperature.
3) Check engine idle speed and "IAC duty" by using
S4RS0A1106001
"Data List" mode on scan tool to check "IAC duty".
4) If duty and/or idle speed is out of specification,
inspect idle air control system referring to "Idle Air
Control System Check: ".
Engine idle speed and IAC duty
M/T vehicle
A/T vehicle at
P/N range
5) Check that specified engine idle speed is obtained
with A/C turned ON if vehicle is equipped with A/C.
If not, check A/C system circuit and idle air control
system.
(A)
I4RS0A110013-
A/C OFF
A/C ON
700
50 rpm
850
10 – 55%
750
50 rpm
850
10 – 55%
50 rpm
50 rpm
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