ENGINE CONTROL SYSTEM 3-63
IAC VALVE
1. Remove IAC valve. (See page 3-69.)
2. When the ignition switch is turned ON and OFF, check that
the rotary valve turns to open and returns to closed.
3. If the valve does not turn, check the wiring harness for conti-
nuity (between ECM and IAC valve) and connector contact
condition.
OCV (Oil control valve)
1. Remove OCV. (See page 3-70.)
2. Check for operating sound (ticking sound) when battery volt-
age applied to and removed from the terminals of oil control
valve.
3. Check resistance between the two OCV terminals.
OCV resistance: 6.0 – 8.0 Ω
MULTI-STAGE INDUCTION
SYSTEM INSPECTION
• Ensure the depression chamber rod pulls the shut off valves
to the complete close position after engine start.
• Ensure the shut off valve return spring returns the shut off
valves to the full open position when the engine is turned off.
DEPRESSION CHAMBER
" 09917-47011: Vacuum pump gauge
• Ensure the shut off valve fully close when vacuum is applied
to the depression chamber with a vacuum pump tool.
Operation start vacuum: 1 – 8 mmHg
Operation end vacuum: 18 – 20 mmHg
1
1. IAC valve
OCV
Depression chamber
Rod
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