SECTION 6 - TROUBLESHOOTING
6-22
– JLG Lift –
3121228
Code 14 - Pump Motor - Disconnected
Check For These Obvious Conditions First:
• Check the Positive (+)/Negative (–) cables from the Ground Control Module to the Pump Motor studs for loose or cor-
roded connections.
Code 15 - Lift Down Valve - Disconnected
Check For These Obvious Conditions First:
• Inspect wire terminals on the lift down valve at the base of the lift cylinder for tight and secure connection.
Table 6-15. Code 14 - Pump Motor - Disconnected
STEP
ACTION
SPEC
YES
NO
1.
Check resistance across the positive (+) and negative (–) studs on th e
pump motor.
SeeTable 6-2
Replace Ground
Control Module
Repair or Replace
Pump Motor or
Motor Brushes
Table 6-16. Code 15 - Lift Down Valve - Disconnected
STEP
ACTION
SPEC
YES
NO
1.
Check voltage at the P1 connector on the Ground Control Module between
pin-10 and pin-3. Is reading within spec?
2 - 4 V DC
Replace Ground
Control Module
Go to Step 2
2.
Check resistance between the terminals on the lift down valve, located at
the base of the lift cylinder. Is reading within spec?
6 Ohms
Repair or Replace
Wiring Harness
from Ground Con-
trol Module
Replace the
Lift Down Valve
Solenoid
3.
With the terminals still removed from the lift down valve coil, check continu-
ity of the wires from pins 10 and 3 on the P1 connector to the lif t down valve.
.00
Ohms
—
Repair
or
Replace
Wiring
