Miker7 Posted February 20 Share Posted February 20 Went out for a little run at lunch time. My temperature gauge is reporting around 80 degrees but when I connect to the odb2 port its reporting around 95. As I'm a computer nerd i'm assuming the odb2 port is more accurate. Any suggestions on how I can get the gauge to report the temperature more accurately or prove which is the correct (accurate) temperature? Also my fuel gauge has a mind of its own, its frequently reporting empty when i start the car. 20 mins into a run it decided to report just over half full. Cars a 01 k series. Link to comment Share on other sites More sharing options...
BigCol Posted February 20 Share Posted February 20 @revilla has developed a “Gauge Magic“ circuit (see this thread) that enables the necessary correction. Unfortunately he’s currently reclusive and I don’t think producing any (I’d like one for my fuel gauge!). I hope his circumstances will improve and he’ll be back soon. Link to comment Share on other sites More sharing options...
Miker7 Posted February 20 Author Share Posted February 20 I've been meaning to reach out to him as I know he helped the previous owner of my car out, id like to understand more what he did. I'm also interested in speaking to him as I've developed the code for speeduino engine management to support Rover ecus so we seem to have similar interests. I'll now add gauge magic to the list. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 20 Member Share Posted February 20 21 minutes ago, Miker7 said: Any suggestions on how I can get the gauge to report the temperature more accurately or prove which is the correct (accurate) temperature? The first part of this is deciding on the reference method. How about heating up some water in a jug, putting the sender in that, and comparing the result with a known good thermometer? Jonathan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 20 Member Share Posted February 20 (edited) 5 hours ago, Miker7 said: My temperature gauge is reporting around 80 degrees but when I connect to the odb2 port its reporting around 95. ... Cars a 01 k series. On K series Sevens with ODB2 does one sender drive both that and the gauge or are there two senders? Thanks Jonathan Edited February 20 by Jonathan Kay Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted February 22 Leadership Team Share Posted February 22 Two senders. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 22 Member Share Posted February 22 2 hours ago, SLR No.77 said: Two senders. Thankyou Do they have the same thread and terminals? Jonathan Link to comment Share on other sites More sharing options...
Miker7 Posted February 22 Author Share Posted February 22 I can guess where this is heading - swap the sensors round and see what happens. They're only an inch (*) or so apart if i remember correctly so i doubt location will be making a difference. (* imperial chassis so this is a valid unit of measure) Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 22 Member Share Posted February 22 : - ) Jonathan Link to comment Share on other sites More sharing options...
raw Posted February 22 Share Posted February 22 Gauge sender has one terminal and ecu sender has two terminals. Currently know of a 2021 R420 Duratec (not mine) that has the same issue; when the car comes off SORN I'll run Easimap and see what the issue is. Andrew Link to comment Share on other sites More sharing options...
Miker7 Posted February 22 Author Share Posted February 22 The reason the ECU had two terminals is so that the ground signal goes back to the ECU which is more accurate. You could fit a two terminal coolant temperature sensor for the gauge and just use the signal terminal - assuming the sensor responds the same as the single terminal sensor. Link to comment Share on other sites More sharing options...
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