Help IAT
Just Passin' Thru
Joined: Jul 2005
Posts: 236
Likes: 1
From: Diboll TX
I see from your profile that you have a '99. A couple of years ago, I had a similar problem with the IAT. I finally found that one of the wires had broken inside the insulation. It wasn't visible from the outside, but had broken as if the strands were brittle. I don't know whether Chevy had a batch of bad wire or what, but I stripped a little insulation back on both ends, soldered the wire back together, and wrapped it with electrical tape. It's been holding since then.
If you can get ahold of an ohm meter with sharp pointed probes, you can gently pierce the insulation a few inches apart and see if you have continuity. Repeat this down the length of the wire that you can get to and I'll bet you find a spot where the wire is broken.
Good luck and HTH....
If you can get ahold of an ohm meter with sharp pointed probes, you can gently pierce the insulation a few inches apart and see if you have continuity. Repeat this down the length of the wire that you can get to and I'll bet you find a spot where the wire is broken.
Good luck and HTH....
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Yep,, sounds like a bad connector or a bad wire inside that connector. If you read across the two terminals inside the harnass connector with an ohm meter, what readings do you get? You can also read each one to ground. BC
Pro
Joined: Aug 2000
Posts: 517
Likes: 0
From: Arlington Texas
I disconnected the IAT when I removed the intake manifold last weekend. Now I have P0113 and P1111 codes that won't go away. Bill, what should the readings be? When I measure across the two terminals, I have an open circuit. Measuring each terminal to ground, the purple wire measures 0 ohms, and the other wire is open.
Pro
Joined: Aug 2000
Posts: 517
Likes: 0
From: Arlington Texas
My problem was a break in the tan wire just as it went into the connector. I used a pin to pierce the insulation about an inch back, and I used an ohm meter to check connectivity from the pin to the connector terminal. As I flexed the wire, the connection would alternately make then break. I clipped the wires and pried the terminals out of the connector. I soldered the wires back on the terminals, stuck them back in the connector, and it's fixed.
Thread Starter
Burning Brakes
Joined: Jan 2007
Posts: 833
Likes: 2
From: Boca FL
My problem was a break in the tan wire just as it went into the connector. I used a pin to pierce the insulation about an inch back, and I used an ohm meter to check connectivity from the pin to the connector terminal. As I flexed the wire, the connection would alternately make then break. I clipped the wires and pried the terminals out of the connector. I soldered the wires back on the terminals, stuck them back in the connector, and it's fixed.
Last edited by coanan; Feb 23, 2007 at 09:07 PM.
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