JLG DVSP Series Service Manual - Manual (Page 138)

SECTION 6 - TROUBLESHOOTING
6-24 – JLG Lift – 3121136
Code 30 - Traction Module - No Communication with Ground Control Module
Check For These Obvious Conditions First:
• Check if the communications cable connections, P5 connector on the Ground Control Module and round plug on the
Traction Control Module are seated properly in their sockets at each end.
• Check the Positive (+) (RED) and Negative (–) (BLACK) power cable connections from the Ground Control Module to the
Traction Control Module are tight and secure at both ends.
Table 6-31. Code 30 - Traction Module - No Communication with Ground Control Module
STEP ACTION SPEC YES NO
1. Check the voltage reading at the main power Positive (+)/Negative
(–) cable connection on the Traction Control Module.
24v DC Go to Step 2
Repair or Replace
Positive (+) or
Negative (–)
Cable
2. Remove the communications cable, P5 connector at the Ground
Control Module and round connector at the Traction Control Module.
Check continuity of all three (3) wires in the communications cable
from end to end. P5 - Pins 2, 3, and 4.
— Go to Step 3
Repair or Replace
Wire(s)
3. With communications cable disconnected at both ends, check for
continuity between Pins 2, 3, and 4 of the P5 connector end.
—
Repair or Replace
Wires
Go to Step 4
4. Plug the communications cable on the Traction Control Module to
the round socket on the opposite end of the module. Does this fix
problem?
— Done
Replace Traction
Control Module
5. Unplug the P5 connector at the Ground Control Module. Check volt-
age between pins 2 (– lead-in) and 5 (+ lead-in). Is voltage within
spec.
4.5v DC Done
Replace Ground
Control Module