User manual

37 of 148
Troubleshooting Notes
1. To check for proper CAN communications place GSC400 in AUTO mode
with the ECU powered and check that the engine temperature on the front
panel display is not displaying N/A (engine temperature must be set to
J1939). “N/A” indicates no communications with the ECM.
2. The ECM should start and run the engine – even if there are no CAN
communications with the GSC400 – when the GSC400 turns on the fuel
and crank outputs. If there are no communications between the ECM and
GSC400, the GSC400 will not stop the crank cycle when the engine is
running as it is not receiving the engine speed.
3. If the ECM is not starting the engine then there is an issue with the wiring
on the ECM. Most ECMs have multiple power and ignition inputs that
must be connected for it to operate properly.