TROUBLESHOOTING USING GSC FAULT CODES - Continued
This failure is displayed when main contactor K1 is closed (input is grounded) and one or both of
the following are true:
The difference in phase between the generator and the bus is greater than 10 degrees.
When the above conditions are true for more than two seconds, the fault will occur. The GSC will
then stop the synchronization process until the fault is cleared and corrected.
CID 1167 FMI 04
K1 sense input (P7-25).
FMI 04 - Voltage Below Normal.
Turn the ENGINE CONTROL switch to OFF/RESET. Battery Disconnect Switch
is OFF; DEAD CRANK SWITCH is OFF.
Disconnect wire at TB3-12 leading to P7-25 per FO-4, sheet 4.
Set Battery Disconnect Switch to ON, Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to COOL DOWN/STOP.
Measure voltage on end of wire (TB3-12 +) with respect to TB3-1 (-). Record
Check A6 BTB fuses (FO-1, Sheet 5). Replace if necessary. Verify wiring for A6
BTB (FO-1, Sheet 5). Repair if necessary (WP 0090).
Turn the ENGINE CONTROL switch to MANUAL START.
Adjust engine speed so the generator frequency is more than 0.2 Hz different
(high or low) than what is on the load bus.
Perform the Permissive Paralleling Procedure. TM 9-6115-729-10, WP 0006.
Ensure the Synchroscope is present on the GSC display.
Touch the loose end of the disconnected wire to TB3-1 (Ground).
a. If fault CID 1167 FMI 04 is displayed on the GSC, repair or replace harness
b. If fault is not displayed or if voltage measured in STEP 4 was not 9.5 to 11.5
Vdc, check all GSC fuses (FO-4, Sheets 3 and 5). If GSC fuses are ok,
Verify the problem has been resolved.