TM 9-6115-729-24
0009
TROUBLESHOOTING USING GSC FAULT CODES - Continued
NOTE
Slave receptacle (NATO connector) is electrically live at all times and is unfused. The Battery
Disconnect Switch does not remove power from the NATO connector. Use caution when
connecting or disconnecting cable(s) to the NATO connector to prevent damage to equipment.
Use caution when troubleshooting this circuit. This circuit is only dead when the batteries are fully
disconnected.
SYMPTOM
65.
CID 1169 FMI 02
MALFUNCTION
AC transformer box (ATB) sensor.
FMI 02 - Erratic, Intermittent, or Incorrect Signal.
CORRECTIVE ACTION
STEP 1.
Turn the ENGINE CONTROL switch to OFF/RESET. Battery Disconnect Switch
is OFF; DEAD CRANK SWITCH is OFF.
STEP 2.
Set Battery Disconnect Switch to ON, Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to MANUAL START.
STEP 3.
Using the GSC, note the values of voltages by phase and record.
a. Turn the ENGINE CONTROL switch to OFF/RESET. Battery Disconnect
Switch is OFF; DEAD CRANK SWITCH is OFF.
b. Check fuses A5F1 thru A5F3 on ATB A5 and replace, as required (WP
c.
If voltages were not within 5% of the desired values and within 5% of each
other, repair or replace generator harness between GSC and ATB A5 per
the next step.
d. If voltages were not within 5% of the desired values and within 5% of each
other, repair or replace generator harness between generator output and
ATB A5 per FO-4, sheet 3 and FO-3, sheet 2 (WP 0090). Verify the problem
is resolved. If not proceed to the next step.
f.
If ATB A5 is good, continue to next step.
STEP 4.
Set Battery Disconnect Switch to ON, Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to MANUAL START.
STEP 5.
Read Line to N voltages for all three phases on GSC and record
STEP 6.
Measure the voltages at TB1 between terminal 10 and terminals 1, 2 & 3, and
record.
STEP 7.
Measure the voltages between TB1, terminal 10 and A5F1, A5F2, and A5F3.
Record voltages.
STEP 8.
If voltages do not match, troubleshoot wiring harness (WP 0090) between TB1
and A5. Repair or replace wiring harness as necessary.
0009-56
