T444E computer help needed

Discussion in 'International Forum' started by 4x4_Welder, Feb 6, 2015.

  1. 4x4_Welder

    4x4_Welder Medium Load Member

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    Sep 16, 2014
    Eastern Orygun
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    I am working on a 4700 chassis tow truck with a T444E in it. It has no power, and a definite miss on one cylinder. Injectors ohm out within spec, I replaced the valve cover gaskets and injector harnesses with no change. I would like to check the wiring from the computer to the valve cover plug, but I can't find a pin out for the computer plug.
    Does anyone have a pin out guide for the computer in this truck?
     
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  3. Ezrider_48501

    Ezrider_48501 Road Train Member

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    do you have a check engine light on?

    have you tryed a new crank position sensor?
     
  4. 4x4_Welder

    4x4_Welder Medium Load Member

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    No and yes, I put a CPS in it last night. It had a code for cam sensor pulses and was randomly shutting down.
     
  5. 4x4_Welder

    4x4_Welder Medium Load Member

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    It doesn't have a warning light on currently, but I did pull codes for the EBPS (disconnected and tube port plugged), and cam sensor. The EBPS doesn't effect anything since this truck does not have a back pressure valve, and the CPS code is gone now with the new sensor.
    I test drove it again, and it has a little more power since it only has one dead cylinder, but still #2 is not firing. There is no smoke, however I did get a code now for an open injector circuit on the left bank. What I'd like to find out is which pin on the computer end of the harness correlates to which injector.
     
  6. Heavyd

    Heavyd Road Train Member

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    What year is this? 444 had both 3 box ECMs or one ECM depending on what year. If you have ECM mounted over the valve cover then that is the one ECM type. If the wire harness goes to the firewall then that is the 3 box system. Wiring is all different between the two. Try to wiggle the wire harness between the ECM and valve cover pass through and see if that does anything. The pins could be weak or spread in the harness connector or bad wiring. The injector can still ohm out ok, but be mechanically failed internally to cause issues like this.
     
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