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.
3.
KNOWN INFO
TEST OPTIONS
Error Code, EC 01 and/or
Is continuity measured
Continuity Test.
EC 19.
on the digital controller
Cab digital control box
wiring harness, transit
REASON FOR QUESTION
OK.
valve solenoid circuits?
Cab interface wiring
Power to activate the
harness OK.
transit valves is trans-
ferred from the digital
POSSIBLE PROBLEMS
control box to the transit
valve solenoids via this
Digital controller wiring
harness.
harness faulty.
Transit valve faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
YES
4-424.14
18
Change 1
