2000 E46 316i 1.9 Poor starting and rough runner.

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  1. 2000 E46 316i 1.9 Poor starting and rough runner. 
    #1
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    paulb00's Car Details
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    316i e46
    Year of Manufacture:
    1999
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    Hey All. I am looking for a bit of help finding where the power supply to both my O2 sensors comes from. I have had some rough running for a while now and discovered today that neither probes have a power supply to them. I checked both connections on the wiring harness that correspond to the white wires on the sensors with ignition on and then engine running. I seem to be getting the correct reading from the probe signal wires, and I have nearly no resistance across the heater wires. Does this mean the sensors are shorting? As far as I can tell the power supply wires in the harness go direct to the ecu but I'm not sure if there is a relay before this or even a fuse. All advice greatly appreciated.
     
     

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    #2
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    mojojojo's Car Details
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    2002
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    i had a losss of power to some of my sensors and traced it back to the ecu compartment, not familiar with your model but if its similar to mine (n42), in the ecu box is a small black fuse box (see pic) one of them had blown!
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    #3
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    paulb00's Car Details
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    Year of Manufacture:
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    Quote Originally Posted by mojojojo View Post
    i had a losss of power to some of my sensors and traced it back to the ecu compartment, not familiar with your model but if its similar to mine (n42), in the ecu box is a small black fuse box (see pic) one of them had blown!
    If you mean the one like a cartridge with five fuses, I checked them all with a multimeter and couldn't find any blown.That photo is pretty much what I have too. I traced the two power supply wires to a green and brown wire in the 2nd from right plug on the ecu. I read on the interweb that there is a relay behind the glove box but i'm not sure if its one of them. Any ideas
     
     

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    #4
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    paulb00's Car Details
    Model of Car:
    316i e46
    Year of Manufacture:
    1999
    Transmission Type:
    Manual
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    Quote Originally Posted by mojojojo View Post
    i had a losss of power to some of my sensors and traced it back to the ecu compartment, not familiar with your model but if its similar to mine (n42), in the ecu box is a small black fuse box (see pic) one of them had blown!
    If you mean the one like a cartridge with five fuses, I checked them all with a multimeter and couldn't find any blown.That photo is pretty much what I have too. I traced the two power supply wires to a green and brown wire in the 2nd from right plug on the ecu. I read on the interweb that there is a relay behind the glove box but i'm not sure if its one of them. Any ideas?
     
     

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    mojojojo's Car Details
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    Is your engine management light on? As for the relay behind the dash i'm not sure sorry,( i've not ventured that far yet!) the following link should have more details on your electrics

    http://www.bmw-planet.com/diagrams/r.../e46/index.htm
     
     

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    #6
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    paulb00's Car Details
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    Yeah. its been on for a while. Us Irish are all gave up our jobs trying to pay for our bankers so i have to keep costs down. Had codes p0171 and p0141 read recently, thats why I started looking at lambda probes. Thanks for the link too. Been looking for wiring diagrams for a while now.
    Last edited by paulb00; 22-02-2011 at 15:39.
     
     

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    Same here mate, watching the pennies! 12 months ago it would be straight to the garage but not now. Try, try, try before you buy is my new motto.
    As for your codes:
    P0141 causes could be - wiring, H02S, ecm
    P0171 causes could be - intake/exhaust leak, air system, MAF/VAF sensor, fuel pressure/pump, injector(s), H02S
     
     

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    paulb00's Car Details
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    I'm going to try a smoke test for air leaks. Can't find a leak in the exhaust. MAF is good. Not sure about pressure reg or pump, waiting for a pressure tester from a mate. I'm fairly sure the o2 sensors work well once they're hot. I have a lurch sometimes when its driving and its very reluctant to rev above 4K rpm and theres a bit of a lag around 2500rpm which is suggesting poor fuel pressure, I'll know more when I check fuel pressure. Cheers for the help here too mate. Much appreciated.
     
     

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    Recently read a P0171 code was air leak on idle valve!!! Good luck mate and post back how you get on.
     
     

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    Found the problem. MAF sensor was dodgy the whole time. I checked again with eobd reader and air flow was fluctuating wildly. Don't know how or why I missed it last time but all my problems are solved. The power supply issue to o2 sensor was my own lack of understanding of the system. But I'm a happy camper again. Go a MAF for 80 euro so it all worked out.Thanks Mojojojo for your help.
     
     

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    mojojojo (25-03-2011)

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