TROUBLESHOOTING USING GSC FAULT CODES - Continued
This output varies from +5 Vdc to -5 Vdc and is sent to load sharing module A4 to generate the
signal sent to the engine controller to set and control the speed of the engine. If the
synchronization is disabled, the output will be approximately 0 Vdc.
Set two generators in parallel mode per TM9-6115-729-10. Generator set A will be the test unit (with the
fault) and generator set B will be the load unit.
CID 1038 FMI 02
CID 1038 FMI 03
CID 1038 FMI 04
Speed adjust 1 output P7-27 (+) and P7-28 (-).
FMI 02 - Erratic, Intermittent, or Incorrect Signal.
FMI 03 - Voltage Above Normal.
FMI 04 - Voltage Below Normal.
Turn the ENGINE CONTROL switch to OFF/RESET. Set Battery Disconnect
Switch to OFF. Set DEAD CRANK SWITCH to OFF on generator set A. Set
SYNC MODE switch to OFF.
Disconnect wire from LSM A4-24 per FO-4, sheet 2, on generator set A.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
Turn the ENGINE CONTROL switch to COOL DOWN/STOP, on generator set A.
Measure the voltage on the end of the wire (A4-24+) with respect to A4-25.
b. If harness is good continue to next step.
On both generator sets, set Battery Disconnect Switch to ON. Set DEAD
CRANK SWITCH to NORMAL. Turn the ENGINE CONTROL switch to MANUAL
START. Set SYNCH switch to SEMI-AUTOMATIC. Close load contactor on
generator set B.
what is on the load bus (generator set B).
Allow the voltage to stabilize.