VEMS Community Forum
VEMS => Software => Topic started by: mr_g on June 05, 2009, 08:05:07 pm
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I have found out, when the engine is off, rpm outputs the signal like 10 time lower frequency, cca 100rpm... My response was: WTF!
Does anybody know anything about this?
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TRY to use coax cable or sometihing shielded. got the same problem of ghost rpm with standard 1mm 2 wires when turnig key to acc on after few seconds.
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You think that VEMS doesn't send this signal? ???
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If you have cut the 12v to the ecu then it´s not possible.
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ECU has 12V, because I'm starting it up. But I have just added ignition signal,with no cranking, and engine isn't started. But VEMS is supplying 100rpm (cca 1.5Hz) signal on the rpm output. After cranking and starting engine, I would get about 10 times higher frequency, about 1000rpm (cca 15Hz)..
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I have not had that happen.
Might want to up the pull-up resistance
What is it now?
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you get some interferance. from hi current wires to lambda or injectors. try removing all fuses except vems supply fuse and then check rpm for ghosts :)
Solved same problem with some hi quality coax. from vems to rpm trigger. I was getting for a few seconds like 300 400 rpm but onley with the lambda fuse connected. and engine was off!
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So it's wbo2 heater creating interference?
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So it's wbo2 heater creating interference?
yes.
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Maybe the lower pull up resistor would do the trick...