Engine Idle Speed; Secondary Air Supply System - Honda SH125 Manual

FUEL SYSTEM (Programmed Fuel Iniection)
ENGINE IDLE SPEED
INS P ECTlO N
NOTE:
Make sure the malfunction indicator lamp (MIL)
does not indicate any failure codes before
inspecting the engine idle speed.
Use a tachometer
with graduations of 100 min-'
(rpm) or smaller that will accurately indicate a
100 min" (rpm) change.
Remove the maintenance lid (page 2-4).
Start the engine and warm it u p t o normal operating
temperature.
Stop the engine and connect a tachometer accord-
ing t o the tachometer manufacturer's instructions.
Start the engine and let it idle. Check the idle speed.
ENGINE IDLE SPEED: 1,500 k 100
min" (rpm)
If the engine hard to start or the idle speed is out o f
specification, refer to the Troubleshooting (page
5-
4).
IDLE AIR CONTROL (IAC) VALVE
The IAC valve is incorporated i n the throttle body/
ECM assembly which it operating
by
the step motor.
When the ignition switch is turned t o ON, the IAC
valve operates for a few seconds.
Check the step motor operating (beep) sound with
the ignition switch turned t o ON.
SECONDARY AIR SUPPLY SYSTEM
SYSTEM INSPECTION
Start the engine and warm it u p t o normal operating
temperature.
Remove the luggage box (page 2-5).
Disconnect the air supply hose from the air cham-
ber.
Check that the hose joint (secondary air intake port)
of the air chamber is clean and free of carbon
deposits.
Check the pulse secondary air injection (PAIR) check
valve if the port is carbon fouled (page 5-51).
5-49