David P Posted January 10, 2017 Share Posted January 10, 2017 ATF Temperature Gauge 9 out of every 10 automatic transmission failures are because of overheating. Increasing power of engine, increases heat generated in transmission. Transmission Operating Temperature. http://www.mkivsupra.net/vbb/group.php?discussionid=154&do=discuss Fitting a temperature gauge to a transmission you are working hard, should be a no-brainer. Here are three different ways non - 's skin this cat. 1. Fit A650E sump with aftermarket sensor-boss welded into it, this would provide temp-gauge & benefit transmission with an extra litre of ATF. Big Sump Mod. http://www.mkivsupra.net/vbb/group.php?discussionid=207&do=discuss 2. There's an ECU temp-sensor at front of box in the out-line, that could also drive a temp-gauge. (Details below post #4) Link to comment Share on other sites More sharing options...
David P Posted January 10, 2017 Share Posted January 10, 2017 3. Use an aftermarket inline sensor block fitted before thermostat (As OE - "the best place") with an aftermarket sensor & gauge. (This pretty aftermarket sexy anodised aluminium billet jobbie is silly money. I made mine for pennies from 2 x 3/8" brass tails and a brass threaded T purchased from a local Plumbers Merchant.) http://www.ebay.co.uk/itm/1-8-BSP-3-Way-T-Tee-Equal-Female-Brass-Fitting-Fuel-Air-Gas-Water-Hose-Oil/192023213125?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649 http://www.ebay.co.uk/itm/Male-Thread-Pipe-Fitting-x-Barb-Hose-Tail-Connector-Adapter-SS-304-BSP-NEW/321766443689?ssPageName=STRK%3AMEBIDX%3AIT&var=510675736850&_trksid=p2055119.m1438.l2649 Link to comment Share on other sites More sharing options...
David P Posted January 25, 2017 Share Posted January 25, 2017 :yahoo: Breaking News :yahoo: After many years of informing peeps so............... Q Big-Roll on Drums................... Delboy52 is about to become the first man in the World brave enough to become a non - by running a temp-gauge from the Supra OE ECU ATF temp-sensor! The Temp Gauge Mod is born. Link to comment Share on other sites More sharing options...
Delboy52 Posted January 29, 2017 Author Share Posted January 29, 2017 Voltages courtesy of Shane. 20°C Approx. 12.08 k ohm 110°C Approx. 0.78 k ohm (780R) Link to comment Share on other sites More sharing options...
David P Posted June 15, 2017 Share Posted June 15, 2017 Details for the OE ATF temp loom clip. ( Delboy52 ) 2JZ-GTE, A340E transmission, fluid-temperature loom-connector. Part no. 90980–11025 90980–11401 http://www.theplugdealer.com/shop/product/14862-toyota-90980-11401-6829 (Mike has promised pics of his install.) Delboy52 Link to comment Share on other sites More sharing options...
David P Posted June 29, 2017 Share Posted June 29, 2017 Transmission temperature gauge thread on Supraforums. http://www.supraforums.com/forum/showthread.php?839353-A340E-fluid-temperature-sensor-location How to Prolong Life of A340E Transmission here. http://www.mkivsupra.net/vbb/group.php?discussionid=225&do=discuss Fluid-pressure gauge would be useful too? Link to comment Share on other sites More sharing options...
Delboy52 Posted September 11, 2017 Author Share Posted September 11, 2017 Happened to come across this video describing the difference between ECU temperature sensors and gauge display sensors. 2 pin sensors like the one in the transmission are going to be a "negative coefficient temperature sensor" where resistence decreases as temperature increases. The curve is not linear either but logarithmic so becomes less accurate as the temperature rises. At 5:23 in the video, it is explained that adding another sensor inline with the ECU temp sensor can affect the resistence and result in an inaccurate reading. It may not be a good idea to piggyback onto the gearbox temp sensor for the purposes of a gauge. There is a service port on the left side of the transmission which is apparently best for putting a pressure sensor. Fitting an aftermarket temp sensor can be either a port welded into the sump/pan or on the front most flow-out line of the transmission. Link to comment Share on other sites More sharing options...
David P Posted September 11, 2017 Share Posted September 11, 2017 Before writing this off before you have even yet managed to give it a proper trying-out in the Real-World. First try deleting the present undisclosed incorrect chassis-earth connection to correct the incorrect wiring of your ECU transmission temp-sensor earth-circuit. Like I have been informing/advising/suggesting/asking/job-listing/telling/explaining/discussing/encouraging/p.m.-ing/emailing/telephoning/texting/cajoling/reminding/prompting/mentioning/begging you to do with priority over homo-carbon sexual-fibre, LED's, pink-paint & shiny-things, for the last 2 or 3 years? The ECU is fault-code free & seems to be happy-enough running the engine with this independent earth-circuit incorrectly shorted to chassis-earth, so by comparison, running with a correctly wired independent earth-circuit via a gauge, could only be an upgrade compared to the present & final unresolved cock-up of the umpteen Electro Gremlins found along the way in your OriNodogarmi? Link to comment Share on other sites More sharing options...
Delboy52 Posted September 11, 2017 Author Share Posted September 11, 2017 It "may" not be a good idea to piggy back as it's an ECU temp sensor. My test kit arrived to test the gauges outside of the car just this weekend, so am yet to see how the Toyota gearbox temp sensor operates when linked to a Toyota gauge. Last time I tested it in the car the 10amp gauge fuse blew, so to not risk breaking the car further I'll see if the gauge even works in an isolated condition first. Link to comment Share on other sites More sharing options...
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