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 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.
3.
TEST OPTIONS
KNOWN INFO
Error Code, EC 01.
Continuity Tests.
Is there continuity
Cab digital control box
measured between the
REASON FOR QUESTION
OK.
digital controller wiring
Cab interface wiring
harness (J4) and (P2)?
If there is no continuity
harness OK.
at the designated
positions on the digital
POSSIBLE PROBLEMS
controller wiring harness,
the 24 volt power from
Digital controller wiring
the cab digital control
harness faulty.
box does not reach the
Unload valve solenoid
digital control box.
faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
YES
If all previous
tests were
completed with a
satifactory result,
replace digital
control box (para
4-348.6
2
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