Model 4700 Maintenance Manual
Section 6. Messages and Codes Fault Codes
Refer to the “Pinout Matrix” located in Theory of Operation section for all voltage and resistance values and component interconnection. Code
Description
Notes/Corrective Action
51
Code 51: Pump Contactor Coil Shorted Failure on the contactor driver CT2.
Check the contactor for physical binding and welded tips. Measure voltage and resistance across coil. If OK, replace the PPA.
53
Code 53: Seat Switch Open Seat switch open during lift.
Troubleshoot seat switch, optional battery gate switches, lift switch, and associated wiring.
55
Code 55: Incorrect Battery Installed When the Key switch is turned ON, the PPA checks the battery voltage and compares it with the "SET BATTERY" parameter setting. If the actual voltage is 20% higher or lower than the set value, this code is displayed.
Check battery voltage. Set correct battery voltage via FlashWare (and re-Learn pots) or replace battery with correct voltage battery. If battery and parameter setting is OK, replace PPA.
56
Code 56: Incorrect Start Up Sequence Incorrect start procedure. May appear in conjunction with Code 81.
If the directional switch is left in forward or reverse position when the operator leaves the seat, Code 81 may be displayed after a brief timeout (approx. 30 sec). If code still appears after lever is returned to neutral, cycle the Key switch to clear. Test switches for correct operation. Check continuity of wires from switches to cards.
57
Code 57: Hydraulic Control Board Time-Out An error was detected in communication between the Hydraulic Control Board and the PPA.
Check voltage to PPA and HCB. Check communication wires between PPA, VM, and HCB for continuity and shorts to frame. If OK, replace the PPA.
58
Code 58: PPA Internal Fault Failure on the current sensor.
Check cables to the motor and PPA for continuity and correct torque. Replace the PPA.
5A
Code 5A: PPA Internal Fault PPA internal failure.
Replace the PPA.
5C
Code 5C: PPA Parameter Restore Error PPA internal failure.
Replace the PPA.
Publication 1160093, Issued: 20 May 2013
6-17
