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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 06-19-2013, 09:48 PM
letsgomattmoore letsgomattmoore is offline
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Mein Auto: 1990 325i
Not getting power to fuses

I replaced my head because of I let the timing belt break while I was driving.
When I finally got everything back together the fuel pump wasn't working. I tried replacing the pump and the relays but it didnt fix the problem. The other day my grandpa came over to help and figured out that I wasn't getting power to the fuse and he jumped the relay to find out if the pump works which it does. I was looking through the Bentley manual and I couldn't find anything. Does anyone have advise? It would be appreciated.
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  #2  
Old 06-20-2013, 11:33 PM
7pilot 7pilot is offline
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Go over all the power connections and engine loom connections.
Something has been left disconnected.
Check all the fuses.

m
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  #3  
Old 06-21-2013, 06:41 PM
letsgomattmoore letsgomattmoore is offline
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I checked all the wires I could see that were related and they all had power but the fuse does not. I jumped the fuse and the fuel pump turned on and sprayed my friend with gas. The fuse is fine. It's the connector that doesn't work. Does anyone know if you can take off the top part of the fuse box to look at the connections? And if you can how?
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  #4  
Old 06-22-2013, 01:47 AM
Billwill Billwill is offline
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Mein Auto: BMW E30 318i 1991
How did you jump the fuel relay?

Did you take out the relay and jump pins 30 and 87 in the socket?

You must realise that the main relay and the fuel pump relay has +12 volts on the one side of the relay coil all the time....the other side of the relay coil gets switched to ground by the ECU when the ECU detects that the engine is turning via pulses from the crankshaft sensor.

So you would expect the fuel pump to run if you jumper pins 30 and 87 together as you are now bypassing the relay altogether.

If you jumpered the fuel relay in some other manner you may not have +12 volts going to the engine battery stud from the battery in the trunk.
There are two black wires running from the battery in the trunk to the engine up front....the thick black wire carries power to the fuel pump relay and the injection electronics....this one wire actually has a "fusable link" inside it near to the battery connection. This is effectively a fuse that will blow if there is a major short somewhere or if the battery is connected the wrong way around.
You need to check both black wires for continuety!

There is a good chance after replacing the head that you disturbed the leads going to the crankshaft sensor...check these leads all the way from the sensor to the ECU.

Last edited by Billwill; 06-22-2013 at 01:54 AM.
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  #5  
Old 06-22-2013, 04:04 AM
letsgomattmoore letsgomattmoore is offline
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Yes I jumped the relay at 30 and 87 and it worked. I checked the fusable link and it still has continuity. My problem is the fuse doesn't get power. There is no power going to wear you plug it into the fuse box.
And if the crankshaft sensor is the crank position sensor then I replaced that when I replaced the head also because I broke the bracket and the only way I could find a bracket was with a new sensor also.
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  #6  
Old 06-23-2013, 03:04 PM
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BMWFatherFigure BMWFatherFigure is offline
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I thought that the fuel pump pulsed once for about 2 seconds when you turn the ign on then remained off until cranking when it started again.
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  #7  
Old 06-23-2013, 10:24 PM
letsgomattmoore letsgomattmoore is offline
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I don't know it might. We didnt keep it going for that long. We just tested it to see if it would work and the gas was making a mess. But is there any trick to getting the top of the fuse box off I just don't want to break it?
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  #8  
Old 06-25-2013, 09:34 AM
letsgomattmoore letsgomattmoore is offline
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I got the fuse box off and it looks like everything is connected fine. But the green and purple (or green and blue I'm colorblind can't tell the difference all to well) wire to the fuse still doesn't have power. I'm looking under the dash behind the kick panel for the wires that look like it could be that but everyone I checked has power. Does anyone know where it should go to. And/or suggestions?
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  #9  
Old 06-27-2013, 01:48 AM
Billwill Billwill is offline
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Quote:
Originally Posted by letsgomattmoore View Post
I got the fuse box off and it looks like everything is connected fine. But the green and purple (or green and blue I'm colorblind can't tell the difference all to well) wire to the fuse still doesn't have power. I'm looking under the dash behind the kick panel for the wires that look like it could be that but everyone I checked has power. Does anyone know where it should go to. And/or suggestions?
Google for a circuit diagram

Which fuse number are you talking about?

I still think your crankshaft Position Sensor (CPS) is not working.

Last edited by Billwill; 06-27-2013 at 01:54 AM.
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  #10  
Old 06-27-2013, 07:24 AM
letsgomattmoore letsgomattmoore is offline
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You are right it's the cps. I switched it with another one I had. But now I'm not getting spark. Which connector does the cps plug into I think I might have reversed it when I put it back together.
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