IAC valve has no power

HASSAN SHUAIBU

MEMBER
1995 HONDA ACCORD
2.7L
V6
FWD
AUTOMATIC
150,000 MILES

Please can someone tell the step by step instructions on how to fix the problem of no power getting to my car IAC valve?
Thanks.

Saturday, December 10th, 2016 AT 1:40 PM

5 Replies

STEVE W.

MECHANIC
13,577 POSTS

Looking at the wiring diagram it looks like the yellow with black stripe feeds power to the IAC. The black with blue stripe is the control side. Unplug the IAC and test for power on the yellow/black wire.

The power feed to the IAC comes from a junction block at the left side of the dash. The same power feed also supplies the EVAP Solenoid. Check it for power.
If it has power but the IAC does not that junction connection is the problem.

If you just want it to run and are sure the IAC is good you could connect a jumper wire from the power feed on the EVAP solenoid to the IAC and simply bypass the bad wire.

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Saturday, December 10th, 2016 AT 9:54 PM

HASSAN SHUAIBU

MEMBER
40 POSTS

I will do that Mr Steve and get back to you. You are a life saver.

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Saturday, December 10th, 2016 AT 10:22 PM

HASSAN SHUAIBU

MEMBER
40 POSTS

Thanks Mr Steve. You wonderful

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Sunday, December 11th, 2016 AT 10:59 AM

HASSAN SHUAIBU

MEMBER
40 POSTS

Hello Steve, I have bye pass the faulty wire. When I use a test bulb, I discovered power is now entering the iac. Power gotten from the evap. I will try and check the junction block. But what could be the cause of such wiring problem at the block?

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Saturday, December 24th, 2016 AT 9:36 AM

STEVE W.

MECHANIC
13,577 POSTS

Most common one is corrosion on the traces inside the block. Most of them are built like a printed circuit board and they literally rot off. Another item is the 100,000 for 50 cents connectors and contacts that turn into junk. I've got a Jeep in the shop that has the connection from the starter relay to the connector on the box that failed. Jeeps solution - New power control center @ $300.00. My solution - 10 inches of 14 ga. Wire and some solder for $1.00.