TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
22. PRESSURE SENSORS, PS1 / PS2, INOPERATIVE, ERROR CODE(S) 26 AND 27,
(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.
2.
KNOWN INFO
TEST OPTIONS
Are 22-28 volts measured
Error Code(s), EC 26
Voltage Tests.
at the cab interface
and/or EC 27.
REASON FOR QUESTION
wiring harness connector
Pressure sensor(s) OK.
(J2), position "2" and
Power to activate the
POSSIBLE PROBLEMS
position "3"?
pressure sensor circuits
are supplied from the cab
Cab digital control box
digital control box to the
faulty.
digital control wiring
Cab interface wiring
harness via this harness.
harness faulty.
Faults in this harness will
Digital controller wiring
prevent operation from the
harness faulty.
cab digital control box.
Digital control box faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-414.28
Change 1
42