ARMY
TM 5-6115-612-34
MARINE CORPS
TM 6115-34/8
AIR FORCE
TO 35C2-3-471-2
NAVY
AG-320BO-MME-000
10-2. ENGINE
ELECTRONIC CONTROL
(b) Move MASTER SWITCH to
MODULE (EECM). (cont)
RUN position. All malfunction lights should be off.
a. Test. (cont)
(c) Move MASTER SWITCH to
START position. All lights should be off.
NOTE
(d) Move MASTER SWITCH to
A power source Iess than 0.95 millivolts will
OFF position. All malfunction lights should be off.
give false results. It is necessary to insure
that this power supply ground is independ-
(e) Any discrepancy noted during
ent of all other power suppfies. (i.e. 10-turn
the above procedure indicates failure in the EECM
potentiometer with 9 Vdc Battery.)
engine overspeed circuit. Refer to Table 2-4,
Malfunctions.
NOTE
(5) No speed indication test.
There are various time out functions and
sampling rates used by the EECM Micro-
(a) Adjust function generator to a
processor, As a result some procedures
frequency between 0 to 200 Hz.
are required to be performed in 5-15 sec-
ond time frame or false fault indications will
(b) Move MASTER SWITCH to
occur.
RUN position. All malfunction lights should be off.
(f) Move all EECM test fixture
(c) Move MASTER SWITCH to
switches to OFF position.
START position. Start timing device. The STARTER
Iight should come on.
(g) Move MASTER SWITCH to
RUN position and allow one minute for warmup.
(d) When STARTER light goes off,
stop timing device. It should register between 5 and 14
(3)
Open thermocouple test.
seconds. The STARTER light should go off. Engine
OVERSPEED light should come on.
(a) With MASTER SWITCH in RUN
(e) Move MASTER SWITCH to
position, disconnect one lead from millivolt source. The
OFF position. All lights should be off.
engine OVERTEMP light should come on and all other
Iights should be off.
(f) Any discrepancy noted during
the above procedure indicates failure in the EECM
(b) Reconnect lead to millivolt
engine overspeed circuit. Refer to Table 2-4,
source. Then reset the MASTER SWITCH by moving it
Malfunction 5.
to the OFF position then RUN position. The engine
OVERTEMP fight should go off.
(6) Overtemperature acceleration test.
(c) Move MASTER SWITCH to
(a) Adjust function generator to a
OFF position All lights should go off.
frequency between 0 and 200 Hz and adjust millivolt
source to 96 to 1.20 millivolts.
(d) Any discrepancy noted during
NOTE
the above procedure indicates failure in the EECM
engine overtemperature circuit. Refer to table 2-4,
EECM electronics requires a frequency
Malfunction 4.
below 200 Hz.
(b) Move MASTER SWITCH to
(4) Excessive starter speed test.
RUN position. All lights should be off.
(a) Adjust function generator
NOTE
starting at 0 Hz and adjust to a frequency between
Read step (c) completely before perform-
400 and 450 Hz.
ing step (c).
Change 1
10-11