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.
16.
TEST OPTIONS
KNOWN INFO
Voltage Test.
Error Code, EC09
Are 2228 volts mea-
Engine high idle operates
sured at cab interface
REASON FOR QUESTION
from cab switch.
wiring harness connec-
Engine high idle does not
tor (J2), position # 2
The remote control unit
operate from either RH or
and position # 3?
receives its power source
LH remote locations.
from the cab digital
Remote control unit OK.
control box. The remote
Remote control cable
control will not operate if
OK.
there is no voltage
supply at positions # 2
POSSIBLE PROBLEMS
and # 3.
Cab interface wiring
harness faulty.
Digital controller harness
faulty.
Cab digital control box
Repair or replace
faulty.
cab interface
NO
wiring harness
YES
4-76.2
4
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