TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
3.
ENGINE HIGH IDLE DOES NOT OPERATE (MODEL B ONLY) (continued).
VOLTAGE TEST
ACCESS
(1) Remove three thumb screws and
COVER
access cover on right side of vehicle
under front fender to gain access to
cab interface wiring harness
connector.
(2) Cut and remove wire ties as
necessary to loosen harness and
disconnect male from female end.
(3) Set multimeter to voltage position.
(4) Turn engine start switch to ON
position.
(5) Place negative (-) probe of
P2
J2
multimeter on known good ground.
(6) Place positive (+) probe of
multimeter on position "2", circuit
1473, of cab control box connector
(J2), and check multimeter for
voltage reading, note reading.
(7) Place cab digital mode select switch
in "REMOTE CONTROL" position.
(8) Place positive (+) probe of
multimeter on position "3", circuit
POSITION
1474, of cab control box connector
4
(J2), note reading.
POSITION
POSITION
2
3
NOTE
Position # 4, circuit 1490, should
have a reading of 1 - 5 volts, not 22
- 28 volts. If 1 - 5 volts are not
measured at position # 4, replace
cab digital control box.
(9) Place positive (+) probe of
multimeter on position "4", circuit
1490, of cab control box connector
(J2), note reading.
(10) Turn engine start switch to OFF
position.
CABDIGITAL
MODE SELECT
SWITCH
Change 1
4-4473
7- . 7
