Jon White Posted August 6, 2007 Share Posted August 6, 2007 Sorry - same old question again! Can anyone tell me what resistance there is accross the temperature sender unit on a 200Tdi defender when the engine is running at its normal operating temperature? If no one knows would anyone be kind enough to measure it for me? Needs to be a factory 200Tdi defender using the standard defender guage. A discovery one is different! I'm kind of hoping the answer is going to be in the region of 75 ohms! Cheers Jon Quote Link to comment Share on other sites More sharing options...
Jon White Posted August 7, 2007 Author Share Posted August 7, 2007 Bump! Come on chaps - there must be someone out there who runs a 200Tdi and owns a multimeter surely? Thanks Jon Quote Link to comment Share on other sites More sharing options...
BogMonster Posted August 7, 2007 Share Posted August 7, 2007 I have a multimeter but that is all Quote Link to comment Share on other sites More sharing options...
western Posted August 7, 2007 Share Posted August 7, 2007 Jon, just treid on my 200Tdi with multimeter set to ohms, couldn't get a reading, it wasn't at normal working temp if that makes a difference, can try again tomorrow after a run to get it upto temp, & I know the temp transmitter is working fine as the gauge moves. Quote Link to comment Share on other sites More sharing options...
Guest dew110CSW Posted August 7, 2007 Share Posted August 7, 2007 I had a weird problem with my temp sender today - Was cruising home from work at about 70mph, just pulled up a hill when I looked down and saw the gauge was at the edge of the white (oh ****), so I backed her down to about 40 and limped along the dual carriageway to a lay-by. Once I got there I popped the bonnet and the engine was really very cold (Not even normal working temp - wasn't far from work and hadn't been dogging it). So I set off and the gauge went to half way, until I accelerated when it climbed to edge of white, then shifted to second and dropped to half again, and so on till I got into third. Drove home very carefully after that... Quote Link to comment Share on other sites More sharing options...
Jon White Posted August 7, 2007 Author Share Posted August 7, 2007 Jon, just treid on my 200Tdi with multimeter set to ohms, couldn't get a reading, it wasn't at normal working temp if that makes a difference, can try again tomorrow after a run to get it upto temp, & I know the temp transmitter is working fine as the gauge moves. Thanks Ralph. You need one probe on where the gauge wiring would normally go and one probe on a good earth. You should still get a reading regardless of engine temperature. When its warm a disco one is about 250ohms. I measured the one on Nigels V8 90 the other day and that was about 75 ohms at operating temp, so I'm hoping that a 200 defender one is the same! The reason for wanting to know - the temp gauge in my series reads right in the middle of the gauge with a sender resistance of about 75ohms. I've got a 200tdi discovery lump waiting to go in, and if all I need to do is use the defender sender unit then I'm lauging with getting the temp gauge to work! Unfortunately the series sender unit is designed to run with a 74 degree thermostat, so when you run with an 88 degree (as the tdi does) the needle stays firmly buried in the red! Cheers Jon Quote Link to comment Share on other sites More sharing options...
western Posted August 7, 2007 Share Posted August 7, 2007 OK, I'm on a day off tomorrow, no lekky power in our building/hangar, got to go out in the morning, so will check when I get back before it cools down. Quote Link to comment Share on other sites More sharing options...
Jon White Posted August 8, 2007 Author Share Posted August 8, 2007 Many thanks! Jon Quote Link to comment Share on other sites More sharing options...
western Posted August 8, 2007 Share Posted August 8, 2007 Well, I've tried, couldn't get any where near 75 ohms, multimeter set on the upto 100ohms range & all I could get was 0.3 on the lcd display,tried all the different selections as well, got 82 at the back of the temp gauge. sorry not been much help Quote Link to comment Share on other sites More sharing options...
Jon White Posted August 8, 2007 Author Share Posted August 8, 2007 Hmmmmmm 82 could be what i'm looking for! Many thanks for trying all the same! I've just twigged that a mates got a 200tdi 90, so I might stick my head under the bonnet next time he comes round! Cheers Jon Quote Link to comment Share on other sites More sharing options...
western Posted August 8, 2007 Share Posted August 8, 2007 Just treid again, now the engine is almost cold, multimeter set to 2k range for a resolution of 1ohm, one lead to terminal the wire to gauge connects to other wire to earth [body of transmitter] display shows .975 ohms, as I adjusted the ohm range the last 2 digits disappeared off the scale, so .975 is best I can get at the temp transmitter. my multimeter is a Skytronic model number 600.527. if it helps. Quote Link to comment Share on other sites More sharing options...
Gromit Posted August 8, 2007 Share Posted August 8, 2007 Hmmmmmm 82 could be what i'm looking for! Many thanks for trying all the same! Will have a goo at mine this evening if I remember. It's standard, unlike Ralph's mish-mash of vehicles Quote Link to comment Share on other sites More sharing options...
western Posted August 8, 2007 Share Posted August 8, 2007 Will have a go at mine this evening if I remember. It's standard, unlike Ralph's mish-mash of vehicles darn cheek , it's just the same as yours Quote Link to comment Share on other sites More sharing options...
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