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How to check IACV functioning ?

Civic model year 1980 - 2000
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YEN96
9000rpm Rev Cut
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How to check IACV functioning ?

Post by YEN96 » Fri Nov 21, 2014 12:09 am

Pls advise...can bypass ??

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EK Type-R
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Post by EK Type-R » Mon Dec 01, 2014 12:03 pm

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Electronic IACV (Idle Air Control Valve) cannot be bypassed for EK.. it is also a very costly electronic item essential for the smooth idling of the engine..
a brand-new P6T Type-R IACV (Denso) imported from Japan cost abt S$250.. good item to keep as spares as it is usually unavailable at the stockist..
some write-ups from the internet:


The IACV is an integral part of the idle control system. It changes the amount of air bypassing the throttle body in response to a current signal from the ECU in order to maintain proper idle speed. After the engine starts, the IACV opens for a certain time. The amount of air is increased to raise the idle speed about 150-300 rpm. When coolant temperature is low, the IACV is opened to obtain the proper fast idle speed. The amount of bypassed air is also controlled in relation to the coolant temperature.

When Check Engine light is on. With the service connector jumped, CODE 14 is indicated, OR, scan tool indicates DTC P1508. It is highly likely a fault relating with the IACV.

The IACV is a component whereby when faulty is the most probable cause to most idle-linked problems. The problem can be symptomatic and may not even trigger the Check Engine light. The list goes:

•When cold fast idle out of spec (1,000 - 2,000 rpm)
•Rough idle
•When warm RPM too high
•Idle speed is below specified rpm (no load)
•Idle speed does not increase after initial start up
•On models with automatic transmission, the idle speed drops in gear
•Idle speed drops when air conditioner is ON
•Idle speed drops when steering wheel is turning
•Idle speed fluctuates with electrical load
•Frequent stalling while warming up
•Frequent stalling after warming up

When the two terminals on the IACV are measured with an Ohm-meter, it must vary between 8-15 Ohms. If not, the IACV must be replaced.
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snookium
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Post by snookium » Wed Dec 03, 2014 2:13 pm

Get it from Ming Ghee at $180 exclude GST.

I just replace mine few months back.

Looking high and low from scrap yard as I suffer idling problem.

Btw check your TPS sensor also.

leej8
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Re: How to check IACV functioning ?

Post by leej8 » Sun Jun 21, 2015 3:08 am

Take it off and clean with carb cleaner good clean and let dry before installing, if not work , take it apart and clean ,dry ,install, report back !

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