JLG G12-55A AccuPlace Service Manual - Manual (Page 188)

Electrical System
9.70 G10-55A & G12-55A AccuPlace
RIGHT
STABILIZER
DOWN VALVE –
SHORT TO
GROUND 33230 Loss of current feedback on
UGM pin J3-6 while driving
coil via UGM pin J2-19.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
RIGHT
STABILIZER UP
VALVE – OPEN
CIRCUIT
2
33231 Voltage on UGM pin J2-19
indicates solenoid
disconnected.
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.
RIGHT
STABILIZER UP
VALVE – SHORT
TO BATTERY 33232 Voltage on UGM pin J2-8
indicates STB fault.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
Note: The wire on the low side of the coil
provides current feedback to J3-14 and
can open circuit the electrical path to
ground to prevent current flow through the
coil (to prevent function movement).
RIGHT
STABILIZER UP
VALVE – SHORT
TO GROUND 33233 Loss of current feedback on
UGM pin J3-6 while driving
coil via UGM pin J2-8.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
RIGHT
STABILIZER –
CURRENT
FEEDBACK
READING TOO
LOW 33335 Current feedback on
UGM pin J3-6 > 250ma; but
difference from commanded
current while driving coil via
UGM pin J2-8 > 125ma for 1
second.
N Check for continuity through this circuit.
Inspect wiring for physical damage.
Check the current on the Feedback wire
returning to UGM pin J3-14. This current
should read within 20ma of the value
commanded as read on the Analyzer
under Diagnostics/Ground for either Left
Stabilizer Up or Down functions;
otherwise, there is a degraded
connection. If the value does not track,
temporarily swap connections to assess
whether and how the fault follows the
wiring.
Note: The wire on the low side of the coil
provides current feedback to J3-14 and
will measure an open circuit when a STB
condition exists because the UGM has
open circuited the electrical path to
ground to prevent current flow through the
coil (to prevent function movement).
Help Message
1
DTC Fault Condition
(for configurable items,
fault applies only if
configured)
Fault
Requires
AccuPlace
Reset?
Action(s)