Code 16 - lift down valve - short circuit, Code 17 - ground control module - in fold back, Code 18 - alarm - short circuit – JLG DVSP Series Service Manual User Manual
Page 132: Code 16 - lift down valve - short circuit -18, Code 17 - ground control module - in fold back -18, Code 18 - alarm - short circuit -18, See table 6-19, See table 6-20, See table 6-21
SECTION 6 - TROUBLESHOOTING
6-18
– JLG Lift –
3121136
Code 16 - Lift Down Valve - Short Circuit
Check For These Obvious Conditions First:
• Damaged wiring in the lift down valve wiring harness or a damaged lift down valve coil.
Code 17 - Ground Control Module - In Fold Back
Check For These Obvious Conditions First:
• Has machine been operating on a continuous grade or rough terrain for a long period of time.
Code 18 - Alarm - Short Circuit
Check For These Obvious Conditions First:
• Damaged wiring in the alarm wiring harness or a damaged alarm.
Table 6-19. Code 16 - Lift Down Valve - Short Circuit
STEP
ACTION
SPEC
YES
NO
1.
At the Ground Control Module, P1 connector, check the voltage
across pins 10 and 3 to the lift down valve coil. Is reading within
specification?
0 - 2V DC
Go to Step 2
Replace Ground
Control Module
2.
Remove the wire terminals at the lift down valve coil. Check resis-
tance reading of the coil. Is coil within specification?
24.5 Ohms
Go to Step 3
Replace Coil
3.
With the terminals still removed from the lift down valve coil, check
continuity of the wires from pins 10 and 3 on the P1 connector to the
lift down valve.
.00 Ohms
—
Repair or Replace
Wiring
Table 6-20. Code 17 - Ground Control Module - In Fold Back
STEP
ACTION
SPEC
YES
NO
1.
Allow Ground Control Module to cool for 30 minutes. Does the
machine operate OK after cooling.
—
—
Replace Ground
Control Module
NOTE: If this is a recurring problem compare current draw of your machine with Ground Control Module specifications in
Table 6-3 - Amperage Draw for Various Components.
Table 6-21. Code 18 - Alarm - Short Circuit
STEP
ACTION
SPEC
YES
NO
1.
At the Ground Control Module, P1 connector, check the voltage
across pins-13 and 6 to the alarm. Is reading within specification?
0 - 2V DC
Go to Step 2
Replace Ground
Control Module
2.
Remove the wire terminals at the alarm, check continuity of each of
the wires from pins 13 and 6 on the P1 connector to the alarm end.
—
Replace the
Alarm
Repair or
Replace Wiring