JLG M450 ANSI Service Manual - Manual (Page 213)

SECTION 6 - JLG CONTROL SYSTEM
3121127 – JLG Lift – 6-35
776 77 STALLED PUMP MOTOR OR POWER WIRING ERROR The power module pump MOSFET protection circuit is active,
This is due to a massive current drain and could be a stalled pump
motor or a power wiring error
777 77 OPEN CIRCUIT PUMP MOTOR WIRING Pump point A is collapsing when the pump MOSFETs are pulsed,
this maybe due to an OPEN circuit pump motor or a power wiring
error
7734 77 TRACTION A HIGH - CHECK POWER CIRCUITS Traction point A is near battery supply when neither direction con-
tactor is energized and the traction MOSFETs are OFF, this maybe
due to a welded direction contactor or a power wiring error
7735 77 TRACTION A LOW - CHECK POWER CIRCUITS Traction point A is near ZERO volts when neither direction contac-
tor is energized and the traction MOSFETs are OFF, this maybe due
to a power wiring error
7736 77 TRACTION MOTOR OVERLOADED The traction motor has been operating in current limit at a low per-
centage on for a long time greater than 10 seconds
7737 77 PUMP MOTOR OVERLOADED The pump motor has been operating in current limit at a low per-
centage on for a long time greater than 10 seconds
7738 77 PUMP A LOW - CHECK POWER CIRCUITS Pump point A is near ZERO volts when the pump MOSFETs are
OFF, this maybe due to a power wiring error
7739 77 B+ AND A CROSSED - CHECK POWER CIRCUITS startup test detected B+ is connected to point A and point A is
connected to B+
7740 77 TRACTION CURRENT AT ZERO - CHECK SHUNT WIRING Traction current is at ZERO, this maybe due to an open circuit
between the current measurement shunt and the power module
826 82 RUNNING AT CREEP - PLATFORM OVERLOADED All functions at creep, the Load Sensing System indicates the
Platform is overloaded AND is configured to warn only while the
Platform is overloaded.
827 82 DRIVE & BOOM PREVENTED - PLATFORM OVERLOADED Driving and boom functions are not possible while the Load Sens-
ing System indicates the Platform is overloaded AND is config-
ured to prevent drive and boom functions while the Platform is
overloaded.
99125 99 POWER MODULE FAILURE - HWFS CODE 2 Hardware failsafe tests did not com plete because traction point A
is not safe, or the hardware failsafe is permanently tripped
99126 99 POWER MODULE FAILURE - HWFS CODE 3 Hardware failsafe tests did not complete because a contactor
was energized when all should be turned off
99127 99 POWER MODULE FAILURE - HWFS CODE 4 Hardware failsafe tests did not complete because the hardware
failsafe tripped immediately when the traction MOSFETs were
turned ON
99128 99 POWER MODULE FAILURE - HWFS CODE 10 Hardware failsafe tests failed because the hardware failsafe did
not trip within the allowed test time
99129 99 POWER MODULE FAILURE - HWFS CODE 11 Hardware failsafe tests failed because the hardware failsafe
tripped too slowly
99130 99 POWER MODULE FAILURE - HWFS CODE 12 Hardware failsafe tests failed because the hardware failsafe
tripped too Quickly
99131 99 POWER MODULE FAILURE - HWFS CODE 13 Hardware failsafe tests failed because the hardware failsafe
remained tripped when the traction MOSFETs were turned OFF
99132 99 POWER MODULE FAILURE - HWFS CODE 14 Hardware failsafe tests failed because the hardware failsafe the
line contactor could not be energized when the hardware failsafe
was tripped
Table 6-8. Diagnostic Fault Codes
DTC
Flash
Code
Fault Message Description