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Hi all.
My name is Pablo and I am from Spain and this is my first thread.
I own a XJ12 form 1987 and I got a problem with it.
The main issue is that once it is started the engine shuts off. I noticed that when it shuts off the 85 on the fuel pump relay loses ground. It doesn’t lose the 30 or the 86, it just loses the 85.
I checked the wire from the relay to the ECU at the trunk, the wire is in good condition, I anyway did a jump wire isolating the original one but the same thing happens. I read the entire manual but i can’t find any explanation why the ECU stops grounding the relay. I used the oscilloscope checking the 85 of the relay and the injector signal and fist the 85 ground dissapears and after a couple of seconds the engine stops and loses obviously signal to the injectors, so it is clear that only the relay pump loses activation. The next thing I am going to do is to check what happens with the 50 signla to the ECU and the positive and negative of the ECU but to be honest I thing that I am not going to find anything.
Have you ever have guys this problem before? Could the ECU be the problem?
Thank you and sorry for my english.
My name is Pablo and I am from Spain and this is my first thread.
I own a XJ12 form 1987 and I got a problem with it.
The main issue is that once it is started the engine shuts off. I noticed that when it shuts off the 85 on the fuel pump relay loses ground. It doesn’t lose the 30 or the 86, it just loses the 85.
I checked the wire from the relay to the ECU at the trunk, the wire is in good condition, I anyway did a jump wire isolating the original one but the same thing happens. I read the entire manual but i can’t find any explanation why the ECU stops grounding the relay. I used the oscilloscope checking the 85 of the relay and the injector signal and fist the 85 ground dissapears and after a couple of seconds the engine stops and loses obviously signal to the injectors, so it is clear that only the relay pump loses activation. The next thing I am going to do is to check what happens with the 50 signla to the ECU and the positive and negative of the ECU but to be honest I thing that I am not going to find anything.
Have you ever have guys this problem before? Could the ECU be the problem?
Thank you and sorry for my english.
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