TM 55-1730-229-12
AG 320A0-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Organizational Troubleshooting (continued)
Table 4-2.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(continued)
96.
b.
Connect battery and set MASTER SWITCH to ON. Set ENGINE
CONTROL switch to START and hold while observing GTE %RPM
meters.
c.
At approximately 10% reading on meter, voltmeter should
indicate a reading between 16 and 28 vdc.
Set ENGINE CONTROL switch to STOP when GTE %RPM meter indi-
d.
cates approximately 20% speed. Set MASTER SWITCH to OFF and
disconnect battery.
If reading obtained in step c indicated no voltage present at
e.
10% speed, check engine harness wires 19A20 (P2-F to P7-A).
and 46A20N (P2-N to P7-B) (see FO-3 sheet 2). Replace wires
if open. If wiring is good, replace ECU (paragraph 4-31).
f.
If reading obtained in step c was correct, remove ignition
unit, igniter plug lead, and igniter plug and bench test as
follows:
The output of the ignition unit is approximately 5000 volts. DO
not touch igniter plug during test.
Apply battery voltage (28 vdc). to ignition unit. Connect
g.
positive voltage to P7-B, and negative (ground) P7-A.
Igniter plug spark rate should be approximately 360 sparks
h.
per minute.
i.
If igniter plug spark rate is not correct, replace ignition
unit.
FUEL CONTROL UNIT MALFUNCTION.
97.
If the fuel control unit is suspected of malfunction, test unit as follows:
a. Disconnect battery. Disconnect electrical connector (4,
