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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 05-01-2012, 11:36 AM   #1 (permalink)
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Power input to dme pin 37 problem

I have an 88 325is that i just swapped with engine out of a 325i convertible and have been having the no spark no fuel problem, I have went through several diagnostics and got parts including CPS ( checked resistance and its good ) and new main relay and just yesterday I picked up a new harness and i'm still having this problem. On one of the diagnostics it says you have to have power to pins 18 27 and 37 for the car to be able to start. I have power on 18, 27 but on pin 37 when i check for voltage the meter only moves a couple centimeters thus not having much voltage at all and definitely not enough to tell the ecu that the main relay has been activated thus allowing spark and fuel to the car. What could make pin 37 (if i remember correctly it is a blue/red wire running directly from the main relay all the way to the dme) not get but a hair of voltage. Is there a ground anywhere that has anything to do with this, maybe i have a bad ground. What are all the causes that could cause barely to no voltage at all at pin 37?
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Old 09-25-2012, 07:16 PM   #2 (permalink)
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Just wondering if you ever figured anything out on the no voltage issue? I'm having much the same problem except that I dont have power on pin 27 and 37, but have power on pin 18. I can only take so much failure in a day
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