Re: Fault Code 537 Throttle Unable to Open
Unless Genie supplied instructions, trouble shooting a system with no documentation will be difficult. I know nothing about the engine control system used, but would think that a signal is being sent from the hand controls to a 'governor' of some sort that knows the hydraulic load will increase in about 2ms when the operator pulls on the 'boom lift' lever. A signal should be sent to the throttle body to "Open up a bit, George, we's gonna have a load soonly."
If you can see the signal(VOM) to the throttle body, and the TB does not respond, then you likely need a new one. If you do NOT see the signal(OPEN! throttle), then you have to check the wiring and the 'controller' that is generating(supposed to) the signal for the throttle to open.
There's a youtube by PHAD(Pine Hollow Auto Diagnostic) where he works on a Lima 2.3 used in a lift boom somewhere in Illinois. Techs butchered the wiring, and he was able to make it work again. If you follow his trouble shooting, you may be able to fix your machine.
I would find out which system was being used, Bosch, or Ford EEC(guessing from the original link I posted a few up from this one), and if a USA throttle body is used, check in a boneyard to see if one from another FoMoCo engine would work. I think Ford started using electrical throttle control in 08 or 09, but don't bet more than one donut.
If you can signal the TB to open and close, manually, then it should work, and the problem is likely in the control system. If it will not respond, then likely the TB is defunct. Most seem to use stepper motors to position the throttle plate at a specific position, and expect 'feedback' signal from same to indicate that the plate has moved as specified. If the feedback is not getting to the controller, then the TB is assumed to be bad. Check the feedback circuit also. Some 'count' pulses, some use a variable resistor POT. I know nothing...
tom
|