Suzuki Liana RH413, Service Manual

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1A-139 Engine General Information and Diagnosis:
Repair Instructions
Idle Speed / Idle Air Control (IAC) Duty
Inspection
S3RH0A1106001
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 and adjust according to
maintenance schedule.
• All accessories (wipers, heater, lights, A/C, etc.) are
out of service.
• Air cleaner has been properly installed and is in good
condition.
• Ignition timing is within specification.
• No abnormal air inhaling from air intake system.
After the items are all 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 OFF, if it is available.
Special tool
(A): SUZUKI scan tool
2) Warm up engine to normal operating temperature.
3) Check engine idle speed and IAC duty as follows:
If you have SUZUKI scan tool, perform Step a). If
not, perform Step b).
a) When using SUZUKI scan tool:
i) Select “Data List” mode on scan tool to
check IAC duty.
b) When using duty meter (vehicle without
immobilizer indicator lamp):
NOTE
IAC duty can be checked using diagnosis
connector only for vehicle not equipped with
immobilizer indicator lamp.
i) Set tachometer.
ii) Using service wire (2), ground “Diag. switch
terminal” (4) in diagnosis connector (3) and
connect duty meter (1) between “Duty output
terminal” (5) and “Ground terminal” (6) of
diagnosis connector.
4) If duty and/or idle speed is out of specifications,
inspect idle air control system referring to “Idle Air
Control System Check”.
5) Remove service wire from diagnosis connector.
(A)
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