Can the temperature sender that gives the ECM temperature feedback, be used for the temperature gauge also? Currently, I have two senders, one for the ECM and one for the gauge. I was cleaning things up and wondered if I could eliminate one of the senders.
1986 ski centurion boat, 351W, gt40P heads, edelbrock performer rpm, 1227747 ecm, 72 lb/hr injectors (@18 PSI fuel pressure), .490/.490 lift, intake 278 duration, exhuast 282 duration, 112 lobe separation
1969 camaro, 355ci, performer RPM intake, camel hump heads, 1227747 ecm, 454 throttle body (@18 PSI fuel pressure),
2016 Chevy Cruz
2014 Chevy Silverado
It's not recommended to split the signal from one sender to two devices, at least not without the use of a buffer, but that gets more involved than just using a second sender.
The man who says something is impossible, is usually interrupted by the man doing it.
There are CTS sensors that have 3 pins instead of 2, the extra is for a gauge. But I've never tried to use one...
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
those 3-wire senders are quite useful, actually... some of the later cars went to a single two-wire sensor and drove the coolant temp guage using either a PCM output or over the datastream. the port for the 2nd sensor sometimes wasn't present either, so either drill/tap or use the 3-wire sensor were the only "simple" options.
1995 Chevrolet Monte Carlo LS 3100 + 4T60E
Get the 3 wire sender from a 98 Bonneville 3800 Supercharged. Top two pins (Black and Yellow) are the CTS. Bottom somewhat centered pin (Green) is the temp gauge. Hit me up if you need a pigtail and can't get one.
WIR425_ezr2.jpg
FYI - The response curves for the stock CTS and the stock GM temperature gauge senders are different. They look similar but they are clearly different.
Will it work with any aftermarket gauges? Or just GM type?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
There are many 3100 and 3400 that use the 3 wire sensor as well.Originally Posted by phonedawgz
What? Everything I've seen says otherwise. The documentation I have seen have shown the resistance curves to be the same between coolant senders and sensors.FYI - The response curves for the stock CTS and the stock GM temperature gauge senders are different. They look similar but they are clearly different.
The man who says something is impossible, is usually interrupted by the man doing it.
The third pin (to ground) sender is basically the same as the GM gauge senders have been forever so yes it will work with stock GM gauges but sure it will work with an aftermarket gauge if it can be set to the GM gauge response curve.
The upper curve is the CTS ECM temperature sensor
The bottom curve is the Temp Gauge Sender
I thought so too, but was not sure.
What about oil? Or newer sensors? Or newer gauges for that matter?
There's a three wire oil pressure sensor on a 2004 LS engine I'm working on.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
For sensor pigtails I get all mine from Fastenal. Here's a .pdf someone made and put on the net that is same as last years copy that fastenal gave me.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Uhhh, take a closer look at that chart. The lower curve is labled as "60 to 66 truck sensor", which I can only assume means 1960 to 1966. Unless someone is trying to drive a truck gauge (and probably other gauges of the era) with a late model sensor/sender, this won't be an issue.
The man who says something is impossible, is usually interrupted by the man doing it.
even that isn't a curve as much as a slope, you could get it in a 'good enough' range if you wanted to change it.... you can always put a bit more or less resistance on something like that
but yeah i can confirm that they're pretty much all the same; every gm service manual for every temp sender i've ever read from a fuel injected car is the same chart for resistance vs. temperature
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