Pressure switch relay voltage ?

[waveoff]

If I remember correctly, you can plug in a scantool (dealer item) into the plug under the steering wheel (passenger side maybe?) and watch the IAT drop to like -3 degrees.

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Fred G.
'97 Civic EX supercharged http://www.geocities.com/motorcity/track/4059
Beech 1900D driver...2,558 shp, 10,000+ ft./lbs. tq., top speed 331 mph

[elmo]

black wire from boost gauge- provides ground when there is +0" vacuum
black/yellow wire- +12V should be tapped to ign. source. provides voltage all the time ignition is on.
red/yellow wires- tapped to IAT temp wire.

With the scan tool, when relay kick "clicks" on, there should be a 1*F reading. when not boosting, whatever the temperature is around the sensor.

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99 Civic DX Hatchback, JRSC + FP, Eibach Pro Kit, ST Sway Bars, Borbet Type F's, Yok A520's 205/45-16's

[waveoff]

gsrev posted this http://www.hostboard.com/ubb/Forum40/HTML/001418.html awhile ago. Maybe he has a little more insight on what to do.

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Fred G.
'97 Civic EX supercharged http://www.geocities.com/motorcity/track/4059
Beech 1900D driver...2,558 shp, 10,000+ ft./lbs. tq., top speed 331 mph