Getting code 57 when going into fwd or reverse. Fuse good polarity good on sensor and pos/neg. Put a meter and trying to go fwd or reverse the battery voltage drops to 8 volts then the PMT kicks in and getting code 57. Could I have a bad motor?
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Pull main fuses and check them. With fuses in they appear ok because voltage can feed through control circuit. This voltage will drop and throw a code 57 when trying to travel main fuse is blown and control voltage will obviously not drive truck.
We put the original switch back on and nothing. Checked all fuses. Nothing was wrong with the original. They just wanted a key pad.
I have seen keyswitches appear to be the same but internally they are not. The internal shunts may not be connecting the same way. Are they the same switch? Part Number the same?
Or you got a defective one.
Anyone know about a cushman titan hd 48 volt 2 pass cart. working fine, tech changes keyswitch now we have no power to the controller. Wireing to keyswitch correct checked and double checked, Controller not seemed to be coming on.
Let me clarify, one peice of info that was bad is when I said I was checking voltage at the battery, I had my neg lead on the battery and my positive lead on the positive on the bar between the ED contactor and the F13 fuse. So when I repositioned my positive lead to the battery side of the ED contactor is when I was not getting a voltage drop, so thats how I knew my Voltage drop was through the ED contactor. Hope that clears it up for you.
have seen strange issues like this before
doesn't make sense for the fix after the symptoms previously discussed but glad you got it fixed
congrats
Thanks to everyone for thier input, I figured it out. The main contactor that pulls in, comes off of that to the f13 fuse, was weak coil loosing voltage across the contacts.
when you operate the lift, if your at 26 volts in may drop to 25 volts. It's only dropping on the drive side not the lift.
When it drops to 6 volts or so, the main contacts drop out when you get code 57 so It doesn't stay there very long for anything to heat up or smoke.
What do the battery volts (measured at the battery) drop to when operating lift?
You have the meter right on the 24 volt battery and it drops to 6 volts? I don't see how that can happen with a good battery. Wouldn't there be smoke and fire somewhere?
Gotcha, I really appriciate you assistance.
so you got a good battery in and it still coding out?
hmmm...
since the current sensor wires go straight into the PZ plug on the controller card there might be an issue with the control card.
if you have access to GE Sentry and a laptop you can hook up with that and maybe see if anything strange is going on during runtime.
other than that i'm not sure without being there to look at it physically myself...
That was my first diagnoses so we got in contact with our battery guy and he came and put a newly refurb battery. Also the lift motors are working fine.
voltage drops to 6v across the battery?
assuming this is a 24v system, this is way too much
you have a battery issue, either a discharged battery or some defective cells.
i'm betting on bad cells
Yes, I have. I put a digital volt meter on the battery, turn th unit on and it goes thru a test come on, I step on the floor pedal and the brake releases, I move the handle very slowly and the forwar contactor pulls in as i slowly increase the throttle my battery voltage starts dropping (no movement) when the voltage drops to about 6 volts then the pmt kick out and I get the code 57, does the same thing in reverse, does that tell you anything?
Symptom
Forward or reverse contactors open and close, then can
only be closed by opening and closing the key switch.
Possible Causes
Reversed yellow and green current senors wires
- Insure that the:
- green wire connects to PZ4 with
no open circuits.
- yellow wire connects to PZ3 with
no open circuits or loose connections
Reversed power cable connection.
- Insure that the battery negative cable connects to
SCR NEG and the motor A2 cable connects to SCR
A2
I'm sure you have already checked this?
Thanks for your response, I did have a battery issue so we actually put a newly refurbed battery in the unit, thought that would do it but still code 57. I did check the motor field to ground and is ok. Aslo checked polarity on sensor, okay and polarity on pos/neg is correct. I'm really stumped.
the motor is a possibility
check the cables and the motor itself, ohm it out for field shorts to the frame. Also check the battery to frame grounds.
code 57 is a current sensor issue and if the field is grounded to the frame and battery has grounds to frame through case it could be picking that up as a cross polarity problem.
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