Suzuki WagonR+ RB310 Service Manual page 2467

6-108 ENGINE DIAGNOSIS
TABLE B-4 IDLE AIR CONTROL SYSTEM CHECK
Relay box
Main fuse
INSPECTION
STEP
1 Check engine idle speed and IAC duty
referring to "Idle Speed/IAC Duty Inspection"
in Section 6E.
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?
Main relay
E22-6
E21-6
ACTION
IAC valve
IAC valve
E22-10
E22-5
E22-14
YES
Go to Step 2.
Go to Step 3.
System is in good
condition.
Go to Step 5.
Go to Step 6.
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
operation referring to
Step 2 of DTC P0505
Diag. Flow Table.
Go to Step 8.
Repair or replace A/C
signal circuit or A/C
system.