Guest turboblackpearl Posted March 31, 2006 Share Posted March 31, 2006 the yw wire on my 280zxt harness that is supposed to go to the ignitor is putting out a constant voltage. both of the yellow/white wires are in fact. this causes my ignitor to heat up, and the coil to spark when i turn the key from the on to start position or turn it off. does this mean I have a bad ecu? I am at a total loss here and would appreciate any help. Quote Link to comment Share on other sites More sharing options...
getZ Posted March 31, 2006 Share Posted March 31, 2006 When do you get a voltage? Is it when you are cranking? How big is the voltage? Quote Link to comment Share on other sites More sharing options...
Guest turboblackpearl Posted March 31, 2006 Share Posted March 31, 2006 about 5 volts positive. this is when it's on or cranking. Quote Link to comment Share on other sites More sharing options...
getZ Posted April 2, 2006 Share Posted April 2, 2006 The yellow white wire is the computer output to the ignitor. It should be a series of pulses, but you cannot see this with a multimeter. I had to use a digital storage o-scope to capture the signal. The signal should only be pulsing when the engine is either running or cranking. For the computer to send an output it must see the engine turning which it sees from either the distributor or crank sensor depending on the year engine you have. You mentioned two yellow/white wires? There should only be one coming from the computer. There is a yellow and a yellow with a white stripe. Quote Link to comment Share on other sites More sharing options...
Guest turboblackpearl Posted April 3, 2006 Share Posted April 3, 2006 yeah i know. it's supposed to be putting out negative pulses like you said, but for some reason it's putting out POSITIVE voltage at all times(when car is "on"). i'm thinking it's a bad ecu. Quote Link to comment Share on other sites More sharing options...
Guest turboblackpearl Posted April 3, 2006 Share Posted April 3, 2006 i checked it at the ECU too. about 6 volts positive. just another roadblock i guess. Quote Link to comment Share on other sites More sharing options...
getZ Posted April 4, 2006 Share Posted April 4, 2006 I agree about a bad ecu, but before you give up on it, I would double check your input voltage and ground. It's very odd for a system to fail with a voltage. Usually they go dead. I scored an ecu for 20 bucks on ebay, but that may have been lucky. Quote Link to comment Share on other sites More sharing options...
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