6E1-36
ENGINE AND EMISSION CONTROL SYSTEM
B-4 IDLE AIR CONTROL SYSTEM CHECK (Page 1 of 2)
1. Battery positive voltage
2. Blank
3. “FI” fuse in fuse/relay box
4. Main relay
5. ECM
6. IAC valve
7. Throttle body
8. Engine coolant
9. Bypass air
10. TP sensor
STEP
ACTION
YES
NO
1
IAC valve function check:
1) Check IAC valve referring to IAC VALVE INSPEC-
TION in this section.
Is check result in good condition?
Go to Step 2.
Go to Step 5.
2
Closed throttle position check:
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 following:
EVAP canister purge valve
Accessory engine load PCV
system
Idle air passage
A/C signal
Go to Step 3.
3
Closed throttle position recheck:
1) With the ignition switch OFF position disconnect
negative battery cable for 30 seconds and con-
nect it.
2) Recheck closed throttle position referring to Step
2.
Is each check result as specified?
Recheck engine idle speed.
Go to Step 4.
4
TP sensor signal voltage check:
1) With the ignition switch ON position, check volt-
age between E33-206 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 INSPEC-
TION in this sec-
tion.
5
IAC valve circuit check:
1) Check “O”, “B/R” and “B” wire for open and short.
Are they in good condition?
Go to Step 6.
Repair or replace.
6
IAC valve substitution:
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 recheck.