C40" Iac Valve Circuit Malfunction - Suzuki AN400 Service Manual

"C40" IAC VALVE CIRCUIT MALFUNCTION

DETECTED CONDITION
No IAC valve voltage is supplied after starting the
engine.
INSPECTION
Step 1
1) Remove the frame cover. (#7-18)
2) Turn the ignition switch OFF.
3) Check the IAC valve coupler 1 for loose or poor contacts.
If OK, then measure the IAC valve resistance.
4) Disconnect the IAC valve coupler 1.
5) Check the resistance between the terminals of the IAC valve.
$ Resistance: Approx. 3 – 9 Ω Ω Ω Ω
! 09900-25008: Multi circuit tester set
% Tester knob indication: Resistance (Ω Ω Ω Ω )
Is the resistance OK?
YES Go to Step 2
NO Replace the IAC valve with a new one.
Step 2
1) Remove the IAC valve cover 1.
2) Connect the 12 V battery to the IAC valve terminals for more
than 3 minutes and check for change of the IAC valve tem-
perature from the cold condition.
Is the IAC valve warm up?
YES GO to Step 3
NO Replace the IAC valve with a new one.
(at 20 – 24 °C / 68 – 75 °F)
POSSIBLE CAUSE
• IAC valve circuit open or short.
• IAC valve malfunction.
• ECM malfunction.
FI SYSTEM 4-39