IAT wire gauge question
#1
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IAT wire gauge question
I feel dumb asking this but so goes my ignorance. I need to create a pigtail for the GM IAT sensor to splice into the stock harness for a MS2 on an 04' MSM.
What gauge wire is that OE line? I am assuming that since it is low voltage I really want to have the same wire diameter and length to keep impedance as close to stock as possible.
Thanks.
What gauge wire is that OE line? I am assuming that since it is low voltage I really want to have the same wire diameter and length to keep impedance as close to stock as possible.
Thanks.
#4
Let's assume there is 10 feet of wire from your iat to the ECU.
using 20 gauge wire that's 0.20 ohm of resistance (2 wires x 10 ft leads *.01 ohms per foot).
your IAT sensor has 560 ohm to 7000 ohms operating range.
at 560 ohm or that .2 ohm increase changes your reading by .03%.
at 70000 ohms it's 0.003% change.
So TLDR wire resistance is relatively negligable in an IAT sensor reading for the usual automotive wiring gauges. Just don't use a 40 gauge wire.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies and wire breaking strength
using 20 gauge wire that's 0.20 ohm of resistance (2 wires x 10 ft leads *.01 ohms per foot).
your IAT sensor has 560 ohm to 7000 ohms operating range.
at 560 ohm or that .2 ohm increase changes your reading by .03%.
at 70000 ohms it's 0.003% change.
So TLDR wire resistance is relatively negligable in an IAT sensor reading for the usual automotive wiring gauges. Just don't use a 40 gauge wire.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies and wire breaking strength
#7
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Thanks, y'all. The calibration will be fine with the MS2, but I will be needing to put the stock IAT back on every two years to pass emissions so I need things running without CEL prior to turning/calibrating the MS.
All that has been said makes sense. Wiring is a whole new world for me; steep learning curve.
Cheers!
All that has been said makes sense. Wiring is a whole new world for me; steep learning curve.
Cheers!
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