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
4.
TEST OPTIONS
Error Code(s), EC 26
Continuity Test.
Is continuity measured
and/or EC 27.
on the digital controller
Pressure sensor(s) OK.
wiring harness, pres-
REASON FOR QUESTION
Cab digital control box
sure sensor(s) circuits?
OK.
Power to activate the
Cab interface wiring
pressure sensor(s) is
harness OK.
transferred from the
digital control box to the
POSSIBLE PROBLEMS
pressure sensor(s) via
this harness.
Digital controller wiring
harness 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
4-444.32
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