JLG G12-55A AccuPlace Service Manual - Manual (Page 205)

9.87 G10-55A & G12-55A AccuPlace
Electrical System
LIFT RIGHT
ISOLATION
VALVE – SHORT
TO BATTERY 4573 ISP controller detects
uncommanded current in
feedback circuit on the right
Lift Isolation valve coil. Y Check for continuity through this circuit.
Inspect wiring for physical damage.
Disconnect RT LIFT ISOL VLV coil
connection, cycle power, and verify that
fault changes to DTC 4572 (open circuit);
then check the RT LIFT ISOL VLV coil
connector/pins and wiring. If the fault
remains, remove the 12-pin connector and
verify the integrity of the connector pins of
both the controller and harness, then
dislodge RT LIFT ISOL VLV RTN pin from
the connector, reconnect the 12-pin
connector, and cycle power. If the fault still
remains, dislodge the RT LIFT ISOL VLV
signal pin, reconnect, and cycle power. If
the fault persists, continue this pattern
until all the wires are dislodged. If the only
wires remaining are power and CAN Bus
and a STB fault still exists, then the fault
lies within the controller and replacement
is necessary.
LIFT LEFT
ISOLATION
VALVE – SHORT
TO BATTERY 4575 ISP controller detects
uncommanded current in
feedback circuit on the left
Lift Isolation valve coil. Y Check for continuity through this circuit.
Inspect wiring for physical damage.
Disconnect LT LIFT ISOL VLV coil
connection, cycle power, and verify that
fault changes to DTC 4574 (open circuit);
then check the LT LIFT ISOL VLV coil
connector/pins and wiring. If the fault
remains, remove the 12-pin connector and
verify the integrity of the connector pins of
both the controller and harness, then
dislodge LT LIFT ISOL VLV RTN pin from
the connector, reconnect the 12-pin
connector, and cycle power. If the fault still
remains, dislodge the RT LIFT ISOL VLV
signal pin, reconnect, and cycle power. If
the fault persists, continue this pattern
until all the wires are dislodged. If the only
wires remaining are power and CAN Bus
and a STB fault still exists, then the fault
lies within the controller and replacement
is necessary.
Help Message
1
DTC Fault Condition
(for configurable items,
fault applies only if
configured)
Fault
Requires
AccuPlace
Reset?
Action(s)