Suzuki GA413, Service Manual

Page: 872 / 1246

6-96 ENGINE GENERAL INFORMATION AND DIAGNOSIS
GA413
supple
TABLE B-4 IDLE AIR CONTROL SYSTEM CHECK
1. Main fuse
2. Main relay
3. IAC valve
INSPECTION
STEP ACTION YES NO
1 Check engine idle speed and IAC duty referring
to “Idle Speed / IAC Duty Inspection” in Section
6E.
Is idle speed within specification? Go to Step 2. Go to Step 4.
2 Is IAC duty within specification in Step 1? Go to Step 3. 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
3 Is engine idle speed kept specified speed even
with headlight ON? System is in good
condition. Check IAC system for
operation referring to
Step 2 of DTC P0505
Diag. Flow Table.
4 Was idle speed higher than specification in
Step 1? Go to Step 5. Go to Step 8.
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? Go to Step 6. Repair or replace A/C
signal circuit or A/C
system.