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TM 9-2320-364-20-2
2-1475
(1) Set multimeter select switch to
volts dc.
(2) Connect positive (+) multimeter lead
to wire 213 at retarder relay R8,
terminal 85.
(3) Connect negative (–) multimeter lead
to a known good ground.
(a) If 10 to 14 vdc are not present,
replace ATEC ECU (Para 7-71).
(b) If 10 to 14 vdc are present,
perform Steps (4) through (6)
below.
(4) Start engine (TM 9-2320-364-10).
(5) While assistant applies throttle control
for 10 seconds at 2000 rpm and
quickly releases throttle control,
observe multimeter.
(a) If 10 to 14 vdc are still present,
turn OFF ENGINE switch and
replace ATEC ECU (Para 7-71).
(b) If 10 to 14 vdc momentarily drops
to zero (0) vdc, ATEC ECU is OK.
(6) Turn OFF ENGINE switch.
VOLTAGE TEST
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical
circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.
Circuit breakers CB5, CB6, CB12, CB20, CB22, CB23 and relays R3, R13 - R19, R26, R28, R32, R33
are always electrically hot and can cause severe injury to personnel. Care must be exercised when
working under the electrical circuit board cover.
The ATEC 213 circuit goes to ground when
the engine drops to zero (0) throttle and
remains 150 rpm above a normal idle. This
will provide a ground for the retarder
relay R8 coil.
Relay test must be performed with relay
partially removed.
NOTE
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