TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
22. PRESSURE SENSORS, PS1 / PS2, INOPERATIVE, ERROR CODE 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.
KNOWN INFO
3.
TEST OPTIONS
Error Code(s), EC 26
Continuity Tests.
Is there continuity
and/or EC 27.
measured between the
REASON FOR QUESTION
Pressure sensor(s) OK.
digital controller wiring
Cab digital control box
harness (J4) and (P2)?
If there is no continuity
OK.
at the designated
Cab interface wiring
positions on the digital
harness OK.
controller wiring harness,
the 24 volt power from
POSSIBLE PROBLEMS
the cab digital control
Digital controller wiring
box does not reach the
digital control box.
harness faulty.
Remote control box faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
YES
4-444.30
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