TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
16.1 MAIN FRAME, HOOK ARM, AND WINCH DO NOT OPERATE (MODEL B ONLY)
(continued).
NOTE
The digital controller and the cab control box are not repairable,
therefore, it is necessary to test the digital controller and cab
interface wiring harnesses, switches, solenoids, and other com-
ponents to identify possible faults other than the digital controller
and the digital cab controller.
KNOWN INFO
4.
TEST OPTIONS
Error Code, EC 01, EC
Continuity Tests.
Is there continuity
08 and/or EC 19.
measured between the
REASON FOR QUESTION
Quick-disconnect
digital controller wiring
couplings installed
harness (J4) and (P2)?
If there is no continuity
properly.
at the designated
Hydraulic lines, hoses,
positions on the digital
or fittings OK.
controller wiring harness,
Cab digital control box
the 24 volt power from
OK.
the cab digital control
Cab interface wiring
box does not reach the
harness OK.
digital control box.
POSSIBLE PROBLEMS
Digital controller wiring
harness faulty.
Free flow valve faulty.
Repair or replace
Digital control box faulty.
digital controller
NO
wiring harness
YES
4-386.8
Change 1
92
