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Sensors not reading

Discussion in 'Volvo Forum' started by RyanNZ, Jun 18, 2013.

  1. Jun 18, 2013 #1
    RyanNZ

    RyanNZ Bobtail Member

    7
    0
    Apr 27, 2012
    Auckland, New Zealand
    0
    Hi guys, have just rebuilt the engine in my 1997 FH12 (D12A engine). All sensors etc were working fine when I removed engine, but have just put it back in and now oil pressure and water temperature sensors only read 'SE' on cab display (I think this means values out of range?). A auto electrician had a quick look today but couldn't find anything. He tried feeding the plugs with a variable voltage but nothing changed on display, just says -SE-. ANy ideas what tests I can try? Seems a coincidence that both sensors crap out at the same time.
     
    RyanNZ, Jun 18, 2013
    RyanNZ, Jun 18, 2013
    #1
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  3. Aug 12, 2013 #2
    mark3219

    mark3219 Bobtail Member

    12
    0
    Aug 1, 2013
    0
    A grounding problem will do all jkinds of weird stuff. recheck all ur ground wires...ecm,engine to frame rail, in battery box etc
     
    mark3219, Aug 12, 2013
    mark3219, Aug 12, 2013
    #2
  4. Aug 12, 2013 #3
    VolvoTech0816

    VolvoTech0816 Bobtail Member

    39
    8
    Aug 4, 2013
    0
    what you have going on possibly, on the engine harness it is possible to get your plugs backwards, did you mark all of them when you unhooked? we do a ton of harness at work and sometimes we get someone that tried to install there own and get the 2 sensors right there switched from top to bottom. let me know I have a few other ideas just dont wanna dump them all on ya at once.
     
    VolvoTech0816, Aug 12, 2013
    VolvoTech0816, Aug 12, 2013
    #3
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