TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
3.
ENGINE HIGH IDLE DOES NOT OPERATE (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 main digital
controller and the digital cab controller.
17.
TEST OPTIONS
KNOWN INFO
Continuity Tests.
Is there continuity mea-
Error Code, EC09
sured between the cab
Engine high idle operates
REASON FOR QUESTION
interface wiring harness
from cab switch.
(J2), position "8",and lead
If there is no continuity
Engine high idle does not
1843?
at the designated
operate from either RH or
positions on the cab
LH remote locations.
interface wiring harness,
Remote control unit OK.
the function selected by
Remote control cable
the operator on the
OK.
remote control unit does
Cab digital control box
not reach the digital
OK.
control box.
POSSIBLE PROBLEMS
Cab interface wiring
harness faulty.
Repair or replace
Main wiring harness
cab interface
faulty.
NO
wiring harness
Digital control box faulty.
YES
4-78.4
4
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