TM 9-6115-730-24
0009
TROUBLESHOOTING USING GSC FAULT CODES - Continued
NOTE
This input is high when the bus is live. Input status is compared to reading of bus voltage at
P7-17 and P7-18. If the status of the voltage measurements is different than the dead bus
sense input with regards to presence or absence of bus voltage a fault is announced.
SYMPTOM
61.
CID 1168 FMI 03
MALFUNCTION
Dead Bus Sense Input (P7-29).
FMI 03 - Voltage Above Normal.
CORRECTIVE ACTION
STEP 1.
On EMCP, set the ENGINE CONTROL switch to OFF/RESET. Battery
Disconnect switch is OFF, DEAD CRANK SWITCH is OFF.
STEP 2.
Disconnect wire from relay DBHI pin 2 per FO-4, sheet 2.
STEP 3.
Set Battery Disconnect Switch to ON, Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to COOL DOWN/STOP.
STEP 4.
Measure the voltage on end of the wire (DBHI-2 +) with respect to relay DBLO
pin 4 (-).
a. If voltage is not 9.5 to 11.5 Vdc, repair or replace wiring between GSC and
b. If wiring is good, check all GSC fuses (FO-4, Sheets 3 and 5).
c.
If GSC fuses are ok, replace GSC (WP 0041).
STEP 5.
On EMCP, set the ENGINE CONTROL switch to OFF/RESET. Battery
Disconnect switch is OFF, DEAD CRANK SWITCH is OFF.
STEP 6.
Reconnect wire to relay DBHI-2.
STEP 7.
Ensure that load bus is dead.
STEP 8.
Disconnect the wire from relay DBHI-10.
STEP 9.
Set Battery Disconnect Switch to ON, Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to COOL DOWN/STOP.
STEP 10.
Measure the voltage on relay DBHI-10 (+) with respect to relay DBLO-4 (-).
a. If voltage is not 9.5 to 11.5 Vdc, replace relay DBHI (WP 0042).
b. If DBHI is good, repair or replace harness, as required (WP 0044 and
c.
If harness is good, replace relay DBLO (WP 0042).
STEP 11.
Verify the problem has been resolved.
0009-53
