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Thread: e30 s52 crank no start no power fuse 11

  1. #1
    Join Date
    Sep 2010
    Location
    peekskill, ny
    Posts
    113
    My Cars
    97 M3 91 525i

    e30 s52 crank no start no power fuse 11

    I have posted this in the engine conversion section but I am hoping one of you e30 experts might have the solution.

    I have an 89' 325is. Swapped a 00' S52 from a Z3M. I am having a crank no start issue. Traced it to no power at fuse 11 under cranking. I have the ecu x20 to c101 adapter from garagistic. I am getting continuity to wires before and after connectors. I have connectivity with ecu. The ECU has been flashed for EWS and SAP delete. I also went with m50 manifold and m50 fuel rail bypassing the fuel loss valve.

    Things I have tried: I have swapped 2 different new Cam Position Sensors no change. The cam and crank position sensors have different connectors and are not swapped into the wrong connectors for the wire harness. The fuel lines are not reversed and the fuel pump works (I powered the fuel pump directly and able to start car on first crank but dies shortly after when fuel that i manually primed is exhausted). I disconnected the OBC and spliced the two solid green wires under the steering wheel to bypass the OBC immobilizer. I am not getting power to the number 11 fuse (purple/Red wire on the chassis side from c101 connector to the fuse box or the green/violet wire from the fuse box to the fuel pump). The S52 wire harness has the green/violet wire and is not sending any power under cranking either. I tried to trace wire to fuel pump relay. The wire goes from ecu to x20 connector. The wire harness has 3 relays. I have one salmon colored relay and 2 teal colored ones. I replaced these relays with new ones.

    Here are my questions:
    1) which relay is for the fuel pump or where is it?

    First relay has 5 wires (red,red/yellow,red/white,brown,and brown/green) bentley manual says this is Secondary Air Pump relay
    Second relay has 4 wires (red/white,red,red,and brown) book says this is Main power relay
    Third relay has 4 wires (red,green,green, and brown) book says this is Underloader relay
    The bentley manual says I should have a 4wire relay for fuel Pump (red,red/white,brown/green, and green/violet) but dont see it anywhere attached to the harness or a spot for it on the harness.

    2) Any other suggestions?

    any help or ideas is greatly appreciated

  2. #2
    Join Date
    Sep 2010
    Location
    peekskill, ny
    Posts
    113
    My Cars
    97 M3 91 525i
    Problem solved:
    The z3m wire harness does not have a fuel pump relay attached to it like the e36. The fuel pump relay was mounted in the trunk and later moved to shifter console for some reason. I was able to snip a fuel pump relay and wires from an old m50 wire harness I had in the basement. I spliced the wires to the z3m harness and tapped into the green/violet wire in the loom. Guess since most s52's are sourced from the m3 not z3 there wasn't any real info on this.

  3. #3
    Join Date
    Feb 2009
    Location
    Santa Rosa, C.A.
    Posts
    27
    My Cars
    87 325e Auto
    Thanks for the heads up. I'm doing this swap now. So many little things from the z3m that make such a difference hahaha.

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