Hyster S40FT:
Power drainage when key is off

FI87V,Mazda engine 2011 year,Test light is pulsating like a flasher,have disconnected many items,cannot locate source,Display shows"Hydraulic Interlock" last vault codes 190-8#1 / ECU 522593-12#3 / VSM 522766-4#1
  • Posted 29 Jul 2014 08:34
  • Discussion started by tlpwpb
  • Florida, United States
Showing items 1 - 5 of 5 results.
I read all the post but a test light Is not the tool of choice to check for a draw at battery you use a amp. meter. set meter on Miliamps disconnect one battery lead connect one lead to battery post other to cable make sure key is off check for draw on newer trucks with computers you will see hi current draw for a few minutes until computer goes onto sleep mode than draw will come down the rule of thumb any draw over approx 50 miliamps is to hi l believe that this truck should have approx 13 Milamps in sleep mode.
  • Posted 29 Jan 2022 12:55
  • Reply by Scott_
  • Pennsylvania, United States
I know this post is old but did you ever resolve the battery drain problem?
I have 4 units with the same problem
  • Posted 26 Jan 2022 07:09
  • Reply by fish2121
  • New Jersey, United States
I am not positive, but I think this "hydraulic interlock" message is only on trucks with lever controls. the fingertip controls give a bit different message. I have not run into one that drained the battery that quickly, but that doesn't mean anything,[I don't work for a Hyster or Yale dealer, we just see lots that are traded in, and I am working from (an old mans) memory,,, not what the codes mean, but the rest of it]. I think I might be inclined to first check the alternator as a point of drain, then the power distribution (relay) box right next to the battery, including all the relays (mainly because swapping it out is fairly easy, if you have another truck to borrow a known good unit from).
Good luck, and be sure to let us know what you find.
It is 'sort of normal' to hear some noise from the throttle body within a few seconds of turning off the key.
  • Posted 30 Jul 2014 10:59
  • Modified 30 Jul 2014 11:05 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
Thanks for all the info,(yes lift runs fine,but the draw when key off kills battery fast) couple hrs,yes I know how all the Fortis & Veracitor Trucks have a small (dim) draw when key is off,but this is excessive & its pulsating like a flasher,lift has only 4770 hrs,battery is new,Tks did not now what the "Hydraulic Interlock" meant,Timing belt has not been changed,the codes came from dash display(history)had the hours,first-last,the other codes are likely from me unplugging,at one point I heard the flashing/clicking sound coming from governor area,this unit has the new style(Impco Engine System)model 60 carb with the model J with the EPR attatched,so its hard to even unplug or see the governor,Tks
  • Posted 29 Jul 2014 21:54
  • Reply by tlpwpb
  • Florida, United States
This thing has a few computers and it is normal for computer controlled machines to show some draw on the battery when the ignition is off, the drain is not so much that it will make a good battery dead over a week. why are you looking at that? (what prompted your concern and have you load tested the battery)
I think if you get the operators manual, you will find that the "hydraulic interlock" is from no one in the seat (no operator presence detected) and the hydraulic controls are correctly locked out.
does the machine run?
code 190-8 is a crank-cam synchronization error (did anyone change the timing belt?) is this code one you see in the dash if you sit on the seat, or is this a "historical" code that was never cleared? or is this a code you introduced while checking and disconnecting plugs?
522593-12 is the electronic pressure regulator unplugged
522766-4 is Ignition 3 Relay (RL1) Driver Output Out Of Range Low
  • Posted 29 Jul 2014 09:16
  • Modified 29 Jul 2014 10:24 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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