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 digital controller
and the digital cab controller.
18.
TEST OPTIONS
KNOWN INFO
Continuity Tests.
Error Code, EC09
Is there continuity
Engine high idle operates
measured between the
REASON FOR QUESTION
from cab switch.
remote control cable
Engine high idle does not
If there is no continuity
connector (J8A), posi-
operate from either RH or
at the designated
tion "K" and main
LH remote locations.
positions on the main
wiring harness connec-
Remote control unit OK.
wiring harness, the
tor (J4), position "12"?
Remote control cable
function selected by the
OK.
operator on the remote
Cab digital control box
control unit does not
OK.
reach the digital control
Cab interface wiring
box.
harness OK.
POSSIBLE PROBLEMS
Digital controller wiring
Repair or replace
harness faulty.
Digital controller
Digital control box faulty.
NO
wiring harness
YES
If all previous
tests were
completed with a
satifactory result,
replace digital
control box (para
4-80.6
74
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