Suzuki GA413, Service Manual

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6E-44 ENGINE AND EMISSION CONTROL SYSTEM
TABLE B-4 IDLE AIR CONTROL SYSTEM CIRCUIT CHECK
SYSTEM AND WIRING DIAGRAM
1. Throttle body
2. From air cleaner
3. To intake manifold
4. IAC valve
5. IAC valve connector
6. TP sensor
7. TP sensor connector
8. ECM connector (A)
9. ECM connector (B)
10. ECM
11. Power supply from main relay
SYSTEM DESCRIPTION
ECM transmits duty signal to IC in IAC valve. Then, the IC controls current of IAC valve coils.
INSPECTION
STEP ACTION YES NO
1 Did you perform “ENGINE DIAGNOSTIC FLOW
TABLE” in Section 6?
Go to Step 2. Go to “ENGINE DIAG-
NOSTIC FLOW TABLE”.
2 1) Perform “IAC Valve Inspection” in this section.
Is IAC valve in good condition? Go to Step 3. Go to Step 6.
3 1) With ignition switch OFF position, install SUZU-
KI scan tool.
2) Turn ignition switch ON position, leaving engine
OFF.
3) Monitor closed throttle position (“CLOSE
THROT POS”) parameter on SUZUKI scan
tool.
Does scan tool indicate “ON” when throttle valve is
fully closed and then “OFF” when throttle valve is
opened?
Faulty EVAP canister
purge valve.
Faulty PCV valve.
Faulty EGR system.
Faulty A/C signal.
Faulty engine accessory.
Go to Step 4.