TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15.1 LHS DOES NOT OPERATE PROPERLY IN AUTO (CAB ONLY) (MODEL B ONLY)
(continued).
NOTE
The digital controller and the cab digital control box are not
repairable, therefore, it is necessary to test thedigital controller and
cab interface wiring harnesses, switches, solenoids, and other
components to identify possible faults other than the digital
controller and the digital cab controller.
2.
KNOWN INFO
TEST OPTIONS
Voltage Test.
Error Code, EC 01.
Are 22-28 volts
measured at the cab
POSSIBLE PROBLEMS
REASON FOR QUESTION
interface wiring
Power to activate the hook
harness connector
Cab digital control box
arm solenoid is supplied
(J2), position "2" and
faulty.
from the cab digital control
position "3"?
Cab interface wiring
box to the digital controller
harness faulty.
wiring harness via this
Digital controller wiring
harness. Faults in this
harness faulty.
harness will prevent
Digital control box faulty.
operation from the cab
digital control box.
Repair or replace
cab interface
NO
wiring harness
YES
4-348.4
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