2004 E46 325xi - Misfire, Code 19 EF

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  1. 2004 E46 325xi - Misfire, Code 19 EF 
    #1
    Are
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    The car had been parked outside overnight, and in the morning it would not run smoothly. The code is for cylinder 2 misfire. The coils and plugs (newish) have been swapped, and the fault remains the same. The plug for cylinder 2 was like new, with little sign of firing. I know humidity can upset this car, but it appears to me that there has been a long term persistent fault (its possibly mice nibbling wires). Can any one tell me what checks can be done please? Thanks, Are PS Do the plugs have torque settings? Thanks again. Are.
     
     

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    There are a few checks, firstly you could look at the wires and see if there is any damage on the wire feeding the coil.
    If nothing is visible, you may need to remove the ECU, and test the wires from the ECU pins all the way to the Coil pack plug.

    I have heard of the wiring being damaged a few times now, so it could be the cause.
     
     

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    Are (13-04-2011)

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    Thanks, The End, There is no visible damage to the plastic channel or rubber shrouds, the pins and sockets all look good. There appeared to be nothing obviously wrong under the plastic cover by the brake fluid reservoir. Where is the ECU, and how do I test the wires, do I need a meter? Thanks, Are.
     
     

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    The ECU will be in a box under the bonnet near the bottom of the windscreen.
    They are on the left on UK cars, you may have it on the right side.

    The box has a black lid with hex / allen screws and the main body is a cream / off-white colour.

    You would need a voltmeter / multimeter to check.

    Your ECU is an MS43,and the wiring will be as follows (MS42 diagrams, but same wires)

    Plug 5-
    Pin1 - coil 3
    Pin2 - coil 2
    Pin3 - coil 1
    Pin4 - not used.
    Pin5 - earth
    Pin6 - earth
    Pin7- coil 6
    Pin8 -coil 5
    Pin9 -coil 4


    Plug 5 is the far right side looking into the ECU.
    It will be the far left looking into the cable side.

    The pictures show an MS43 Ecu, close up on plug 5 (you will see "5" written inside, and small pin numbers)
    That photo shows plug 5 with the pins in this order -
    7-8-9
    4-5-6
    1-2-3

    So you want to test the wire that would connect onto the bottom left of the plug. The other picture is how to test the output when the ECU is still connected at the coil plug.

    You may be lucky, and see green rust inside on the pins. Just clean this, and it should solve the problem.
    Attached Images
     
     

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    Are (13-04-2011)

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    Thanks, The End, going to have to settle down to get my head round this one. Are
     
     

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    Everything looked spotless like new, no rust or oxidization, so I took the car to a local garage, and it may be the ECU that has a failure. The car has not run as smoothly as I thought it should have or had much power in the three and a half years that I've owned it. How much are ECU's for this car? Thanks, Are.
     
     

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    ECUs are a lot, I'm not even sure if they can be simply replaced because of the EWS (immobiliser) coding inside.
    It may be a problem with one of the coil pack drivers.
    These are transistors that switch the coil power on and off controllled by small voltages from the processor, like a relay.
    Those components can be changed by an electronics specialist if that is the cause.
     
     

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    Are (15-04-2011)

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    Thanks TheEnd, it's good to know. The person now looking at the ECU is an electronics specialist, and I do know him so it may all work out ok, however technical terms between English and French are difficult. Thanks once again, Are.
     
     

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    "transistor d'allumage"
     
     

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    Are (16-04-2011)

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    Thanks, I had got that far. It was "driver" in reference to transistor that beat me. Are
     
     

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