TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
20. TRANSIT VALVES INOPERATIVE, ERROR CODE 19, (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
2.
TEST OPTIONS
Error Code, EC 01 and/or
Continuity Tests.
Is there continuity
EC 19.
measured between the
REASON FOR QUESTION
Cab digital control box
digital controller wiring
OK.
harness (J4) and (P2)?
If there is no continuity
Cab interface wiring
at the designated
harness OK.
positions on the digital
controller wiring harness,
POSSIBLE PROBLEMS
the 24 volt power from
the cab digital control
Digital controller wiring
box does not reach the
harness faulty.
digital control box.
Transit valve faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
(4-70.1).
YES
4-414.12
Change 1
26
