6E1-34
ENGINE AND EMISSION CONTROL SYSTEM
SH410
B-4 IDLE AIR CONTROL SYSTEM CHECK
1. Battery positive voltage
2. Main fuse box
3. “IG-COIL METER” fuse
4. Main relay
5. ECM (PCM)
6. IAC valve
7. Throttle body
8. Engine coolant
9. Bypass air
STEP
ACTION
YES
NO
1
Check engine idle speed and IAC duty referring to
IDLE SPEED/IAC DUTY INSPECTION on p. 6E1-48.
Is idle speed within specification?
System is in good condi-
tion.
Go to Step 2.
2
1) Check IAC valve referring to IAC VALVE INSPEC-
TION in this section.
Is check result in good condition?
Go to Step 3.
Go to Step 6.
3
1) Connect SUZUKI scan tool to DLC.
2) With the ignition switch ON position, check
“CLOSED THROT POS” in parameter data list.
Throttle valve fully close : ON
Throttle valve slight open : OFF
Is each check result as specified?
Check for followings:
EVAP canister purge
valve
Accessory engine load
PCV system
Idle air passage
A/C signal
Go to Step 4.
4
1) With the ignition switch OFF position disconnect
negative battery cable for 30 seconds and connect
it.
2) Recheck closed throttle position referring to Step 2.
Is each check result as specified?
Recheck engine idle
speed.
Go to Step 5.
5
1) With the ignition switch ON position, check voltage
between E02-6 and ground.
Throttle valve fully close: 0.78 – 0.83V
Is each check result as specified?
Substitute a known good
ECM and recheck.
Check TP sensor
referring TP SEN-
SOR INSPECTION
in this section.
6
1) Check “Or”, “B/R” and “Bl/B” wire for open and
short.
Are they in good condition?
Go to Step 6.
Repair or replace.
7
1) Substitute a known good IAC valve.
2) Check IAC valve referring to IAC VALVE INSPEC-
TION in this section.
Is check result in good condition?
IAC valve malfunction.
Substitute a known
good ECM and re-
check.