JLG G12-55A AccuPlace Service Manual - Manual (Page 190)

Electrical System
9.72 G10-55A & G12-55A AccuPlace
CIRCULATION
VALVE – SHORT
TO BATTERY 3337 Feedback voltage on UGM
pin J1-11 indicates STB
fault. N Check for continuity through this circuit.
Inspect wiring for physical damage.
With the engine off but controller power
on, and with the circulation valve
disconnected, the open circuit voltage at
the valve connector should be around
8.0V or less. If not, continue tracing the
circuit back toward the cab wall (rear of
boom, cab wall, UGM connectors, etc.)
and making measurements to determine
where the STB exists. Once isolated,
perform continuity check to narrow source
of problem.
CIRCULATION
VALVE – SHORT
TO GROUND 33346 Voltage on UGM pin J1-11
while driving coil indicates
STG condition.
N Check for coil damage or a shorting
condition in this circuit.
Inspect wiring for physical damage. The
low side of this coil should be within 1ohm
resistance to the negative battery
terminal.
CIRCULATION
VALVE – OPEN
CIRCUIT 33347 Feedback voltage on UGM
pin J1-11 indicates STB
fault.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
Note: An open circuit voltage of nearly
8.0V exists on this UGM pin for circuit
diagnostic purposes.
REAR
STABILIZER ONE
VALVE – SHORT
TO BATTERY 33348 Feedback voltage on UGM
pin J1-13 indicates STB
fault.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
With the engine off but controller power
on, and with the valve disconnected, the
open circuit voltage at the valve connector
should be around 8.0V or less. If not,
continue tracing the circuit back toward
UGM, making measurements to
determine where the STB exists. Once
isolated, perform continuity check to
narrow source of problem.
REAR
STABILIZER ONE
VALVE – SHORT
TO GROUND 33349 Voltage on UGM pin J1-13
while driving coil indicates
STG condition.
N Check for continuity through this circuit.
Inspect wiring for physical damage. The
low side of this coil should be within 1ohm
resistance to the negative battery
terminal.
Help Message
1
DTC Fault Condition
(for configurable items,
fault applies only if
configured)
Fault
Requires
AccuPlace
Reset?
Action(s)