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 3.
Connect EECM to EECM tester.
Disconnect connector P2 from
switch circuit card.
Connect voltmeter to P2-31(+) and P2-33.
Move tester MASTER SWITCH to RUN position and check voltage.
If voltage is
less than 4.5 or greater than 5.5 Vdc,
replace power supply circuit card (paragraph 10-2b).
If voltage is between 4.5 and 5.5 Vdc, go to Step 4.
Step 4.
Connect voltmeter to switch circuit card P2-24(+) and P2-27(-)
and measure voltage.
If voltage is
less than 11 or greater than 13 volts,
replace power supply circuit card (paragraph 10-2b).
If voltage is 11-13 volts, go to Step 5.
Step 5.
Reconnect connector P2 to switch circuit card.
Measure voltage
on switch connector P1, pins P1-19(+) and P1-20(-).
If voltage is less than 4.5 Vdc, replace switch circuit
card (paragraph 10-2b).
If voltage is greater than 5.5 Vdc,
repair/replace
microprocessor circuit card (paragraph 10-2b).
3.
ENGINE DOES NOT CRANK - PROBLEM ISOLATED TO EECM.
Step 1.
Connect EECM under test to EECM tester. Connect voltmeter to
switch circuit card J6-J and to E1(-) ground terminal.
Move
MASTER SWITCH to RUN position and ensure that unit has power
and has reset (lights will momentarily flash and relays will
click to reset).
Move MASTER SWITCH to START and hold in that
position while making measurements.
If no voltage,
use a sharp probe and check for continuity
between J6-J and P2-22.
Repair or replace as necessary.
If voltage is
20 Vdc or greater,
connect
voltmeter
positive(+) lead to P1-12.
If voltage measures 1.5 to 5.0
Vdc, go to Step 2.
If voltage is
less than 1.5 Vdc,
replace switch circuit card (paragraph 10-2b).
2-42
