JLG G12-55A AccuPlace Service Manual - Manual (Page 206)

Electrical System
9.88 G10-55A & G12-55A AccuPlace
BOOM RIDE
VALVE – SHORT
TO BATTERY 4577 ISP controller detects
uncommanded current in
feedback on the Boom Ride
Mode valve coil. N Check for continuity through this circuit.
Inspect wiring for physical damage.
Disconnect BOOM RIDE VLV coil
connection, cycle power, and verify that
fault changes to DTC 4577 (open circuit);
then check the BOOM RIDE 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 BOOM RIDE VLV RTN pin from
the connector, reconnect the 12-pin
connector, and cycle power. If the fault still
remains, dislodge the BOOM RIDE 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 VALVE –
PRESSURE
SENSOR
VOLTAGE OUT
OF RANGE 4578 Lift valve controller detects
too low or high voltage from
Pressure Sensor 1 or 2. N Cycle power to clear DTC; if DTC is still
present, replace controller (Refer to
Section 8.8.11, “Valve Controllers.”).
CAUTION: HIGH OIL PRESSURE
WITHIN VALVE AND CONTROLLER.
Removing controller may cause cylinder
leakage. Brace/block boom before
removing controller.
TELESCOPE
VALVE –
PRESSURE
SENSOR
VOLTAGE OUT
OF RANGE 4579 Tele valve controller detects
too low or high voltage from
Pressure Sensor 1 or 2. N Cycle power to clear DTC; if DTC still
present, replace controller (Refer to
Section 8.8.11, “Valve Controllers.”).
CAUTION: HIGH OIL PRESSURE
WITHIN VALVE AND CONTROLLER.
Removing controller may cause cylinder
leakage. Brace/block boom before
removing controller.
FORK VALVE –
PRESSURE
SENSOR
VOLTAGE OUT
OF RANGE 4580 Fork valve controller detects
too low or high voltage from
Pressure Sensor 1 or 2. N Cycle power to clear DTC; if DTC still
present, replace controller (Refer to
Section 8.8.11, “Valve Controllers.”).
CAUTION: HIGH OIL PRESSURE
WITHIN VALVE AND CONTROLLER.
Help Message
1
DTC Fault Condition
(for configurable items,
fault applies only if
configured)
Fault
Requires
AccuPlace
Reset?
Action(s)