TROUBLESHOOTING USING GSC FAULT CODES - Continued
This fault code means the ECM has stopped responding to the periodic requests for information
from the GSC.
CID 590 FMI 09
Engine electronic control module.
FMI 09 - Abnormal Update.
Turn the ENGINE CONTROL switch to OFF/RESET. Battery Disconnect Switch
is OFF; DEAD CRANK SWITCH is OFF.
Verify continuity between GSC P7-19 and ECM ENG-P1-8 and between GSC
P7-20 and ECM ENG-P1-9 per FO-4, sheet 1 and FO-2, sheet 2.
a. Repair or replace harness, as required (WP 0090).
b. If harness is good, check all GSC fuses (FO-4, Sheets 3 and 5).
d. If replacing GSC does not correct fault, replace ECM (WP 0084).
Verify the problem has been resolved.