Iac Valve Inspection; Inspect Iac Valve Operation - Toyota 3VZ–FE Troubleshooting Manual

EG–212
ENGINE TROUBLESHOOTING
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IAC VALVE INSPECTION

INSPECT IAC VALVE OPERATION

(a) Apply battery voltage to terminals B1 and B2, and while
(b) Apply battery voltage to terminals B1 and B2, and while
– SFI SYSTEM
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION (w/Airbag): Work must be started after approx.
30 seconds or longer from the time the ignition switch is
turned to the "LOCK" position and the negative (–) termi-
nal cable is disconnected from the battery.
DRAIN ENGINE COOLANT
DISCONNECT IAC VALVE CONNECTOR
DISCONNECT TWO AIR HOSES
DISCONNECT TWO WATER BY–PASS HOSES
DISCONNECT PS IDLE UP VACUUM HOSE
REMOVE IAC VALVE
Remove the two bolts, IAC valve and gasket.
repeatedly grounding S1–S2–S3–S4–S1 in sequence,
check that the valve moves toward the closed position.
repeatedly grounding S4–S3–S3–S1–S4 in sequence,
check that the valve moves toward the open position.
If operation is not as specified, replace the IAC valve.
EG0HB–01