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. Place MASTER SWITCH in
START position and release to RUN position. Inject a signal
into SPEED input.
Increase frequency to 3352 Hz ± 67 Hz.
Connect a voltmeter to P2-6(+) and E1(-) ground terminal. Read
voltage.
If voltage is more than 1.5 Vdc, go to Step 3.
If voltage is below 1.5 Vdc, replace switch circuit card
(paragraph 10-2b).
Step 3.
Connect EECM as in Step 2.
Move voltmeter (+) to P2-9, then to
P2-12, and then to P2-15.
Read voltage at each point.
If voltage at any point is above 1.5 Vdc, go to Step 4.
If voltage is below 1.5 Vdc, replace switch circuit card
(paragraph 10-2b).
Step 4.
Connect EECM as in Step 2.
Move voltmeter (+) to P2-8 and read
voltage.
If voltage is above 1.5 Vdc, replace switch circuit card
(paragraph 10-2b).
If voltage is below 1.5 Vdc, go to Step 5.
Step 5.
Connect EECM as in Step 2.
Move voltmeter(+) to P2-10, then to
P2-11, and then to P2-14.
Read voltage at each point.
If any voltage is above 1.5 Vdc, replace switch circuit
card (paragraph 10-2b).
If voltage is below 1.5 Vdc, go to Step 6.
Step 6.
Connect voltmeter to P1-2.
If voltage is above 1.5 Vdc, replace switch circuit card
(paragraph 10-2b).
If voltage is below 1.5 Vdc,
replace microprocessor circuit
card (paragraph 10-2b).
2-46
