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Ford LRG-425 efi diagnostics

Discussion in 'General Industry Questions' started by NJSchrader, Dec 1, 2022.

  1. NJSchrader

    NJSchrader New Member

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    I'm helping a neighbor with his recently acquired JLG 450aj boom lift. It is a 2001 model with the ford LRG-425 efi engine. When key is turned to run, the electronic throttle body will cycle open/ shut rapidly, and when started the engine will run rough at a high idle and then shut off after 20 seconds or so.
    The engine at some point has been updated from it's original ECM to the new style EPM with Bosch throttle body and O2 sensor, etc. The wiring harness has been checked over thoroughly. Temp, MAP, crank and cam position sensors, as well as throttle position sensor in the throttle body check out. We are leaning towards a fault in the EPM itself. When attempting to pull fault codes, we get 123, meaning no codes present

    We would like to plug a laptop onto the diag connector, but have not been able to aquire the FPP Display software. I've read previous threads regarding this engine in other equipment, and would appreciate any insight.
    A side note, the engine will start and idle perfectly when the installed throttle body is disconnected, and engine harness plugged into the spare TB.
     
  2. Birken Vogt

    Birken Vogt Charter Member

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  3. excavator

    excavator Senior Member

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    Man, I wish I had known you when I was fighting a 425 EFI in a JLG. This would have been a lifesaver.
     
  4. Birken Vogt

    Birken Vogt Charter Member

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    I only work on generators (at the moment), don't know EFI systems specifically, but I am a pretty good fighter of computers and have managed to interface the software to most everything I put my mind to except one, still working on it but it is not important.

    Most of these spark ignition computer systems use the same or similar software.
     
  5. excavator

    excavator Senior Member

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    I fought one for a long while, crank no start. I bought the diagnostic cable ect but was unable to find any info as far as installation on a PC. Your info looks like what I needed, don't need it anymore but might just try it to see if I can make it work. Thanks.
     
  6. Birken Vogt

    Birken Vogt Charter Member

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    If you need any help just ask, if I come to any engine with this control system I attempt to connect to it now so I learn the software and can have it work for me when I really need it.
     
  7. NJSchrader

    NJSchrader New Member

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    Thanks for the download link. I had a chance to look through the instruction pdf, and have a grasp on how it works. What did you use as a dongle to connect to the machine? I'm assuming it communicates over CAN bus. I see there is the ECOM CANCapture device, but was thinking any USB to CAN device 'should' work, with the CAN high and CAN low connected appropriately.
     
  8. Birken Vogt

    Birken Vogt Charter Member

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    This device

    https://www.cancapture.com/ecom

    It does both CANBUS and RS232 to the Econtrols software. The software rapidly cycles through the possible ports looking for something to connect to.

    I had one apart once and it does look pretty proprietary but it is not too expensive.
     
    MarshallPowerGen likes this.
  9. NJSchrader

    NJSchrader New Member

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    Minnesota
    This is an update to our progress with the JLG 450AJ boom lift and Ford LRG-425. We acquired an ECOM usb cable and appropriate 4-pin adapter harness to connect to the diag connector. While running, we had DTC's 311, 313, 315, and 321 as active faults. All being "Injector open or short to ground" for a given cylinder. We also had DTC 412, which is "spark coil 1 primary shorted". After following the flowcharts for each DTC, and not finding any faults in wiring, injectors, or the coil assembly, we have determined our problem lies in the EPM itself.

    Is anyone aware of a reputable shop that is able to work on and repair these E-controls EPM's? Thanks
     
  10. Birken Vogt

    Birken Vogt Charter Member

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    erdltdinc.com was suggested to me as somebody who could repair these.

    Confirm you really do have those injectors and coil present in your application? I have several units that log a continuous fault code when running of starter solenoid ckt open/gas valve ckt open because they are simply not connected, they are controlled another way.