ARMY
TM 5-6115-612-34
MARINE CORPS TM 6115-34/8
AIR FORCE
TO 35C2-3-471-2
NAVY
AG-320BO-MME-OOO
2-3. GENERAL. (cont)
Table 2-4. Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Connect EECM under test to EECM tester. Move MASTER SWITCH to
START position and then to RUN position. Inject a signal into
SPEED input.
Increase frequency to 3352 Hz ± 67 Hz. Connect
an oscilloscope or frequency counter to P1-15(+) and to E1(-)
ground terminal.
If oscilloscope or frequency counter does not show 3352 Hz
± 67 Hz, replace MPU circuit card (paragraph 10-2b).
If frequency is correct,
move oscilloscope or frequency
counter to P1-13(+).
If frequency is still correct, go to
Step 3.
If no frequency indicated, replace switch circuit
card (paragraph 10-2b).
Step 3.
Connect voltmeter to P1-3(+) and E1(-) ground terminal.
6.
NO READY TO
Step 1.
Step 2.
If voltage is less than 1.5 Vdc, replace microprocessor
circuit card (paragraph 10-2b).
If voltage is greater than 1.5 Vdc, move voltmeter to
switch circuit card Q2-C.
If voltage is greater than 1.5
Vdc, replace switch circuit card (paragraph 10-2b).
LOAD LIGHT/GENERATOR ENABLE - PROBLEM ISOLATED TO EECM.
Connect EECM under test to EECM tester. Move MASTER SWITCH to
START position and then to RUN position. Inject a signal into
SPEED input.
Increase frequency to 3352 Hz ± 67 Hz. Connect a
voltmeter to P1-5(+) and E1(-) ground terminal.
If voltage is less than 1.5 Vdc, replace switch circuit
card (paragraph 10-2b).
If voltage is greater than 1.5 Vdc, replace microprocessor
circuit card (paragraph 10-2b).
Move voltmeter to switch circuit card Q9-C.
If voltage is less than 19 Vdc, replace switch circuit card
(paragraph 10-2b).
If voltage is 19-28 Vdc, go to Step 3.
2-44
