Suzuki SY413 Service Manual page 2708

TABLE B-4 IDLE AIR CONTROL SYSTEM CHECK
INSPECTION
STEP
1 Check engine idle speed and IAC duty referring
to "Idle Speed / IAC Duty Inspection" in Section
6E2.
Is idle speed within specification?
2 Is IAC duty within specification in Step 1?
3 Is engine idle speed kept specified speed even
with headlight ON?
4 Was idle speed higher than specification in
Step 1?
5 Check A / C (input) signal circuit referring to
Step 1 of Table B-5 A / C Signal Circuit Check, if
equipped. (A / C signal can be also checked by
using SUZUKI scan tool.)
Is it in good condition?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC) 6-1-109
ACTION
IAC valve
YES
Go to Step 2.
Go to Step 3.
System is in good
condition.
Go to Step 5.
Go to Step 6.
ECM
(PCM)
NO
Go to Step 4.
Check for followings:
– Vacuum leak
– EVAP canister purge
control system
– Clog of IAC air passage
– Accessory engine load
– Closed throttle position
(TP sensor)
– Stuck of PCV valve
Check IAC system for op-
eration referring to Step 2
of DTC P0505 Diag. Flow
Table.
Go to Step 8.
Repair or replace A / C
signal circuit or A / C sys-
tem.