No Comm From Micro to Display
system
Description
Main microprocessor cannot communicate with the display module over the CAN bus, and the unit issues a required shutdown.
Activation Conditions
If alarm 21100 No Comm from Any Board to Main Micro is not active and main microprocessor cannot communicate with the display module over the CAN bus.
Unit Behavior
Engine and Electric Operation: Required Shutdown. If alarm remains active for 2 minutes issue a shutdown command to all modules except the display.
Reset Conditions
Auto reset when CAN communication is restored, or alarm may be manually reset by turning the unit off, then back on again.
Corrective Actions
Check CAN bus a. Inspect connector pins and terminals on 1-1MSM-4 to DM-2 (CAN HI) and 1-1MSM-8 to DM-6 (CAN LO). Ensure no damaged or corrosion in connections. b. Check display LOSS OF COMMUNICATIONS message is displayed. c. Check for CAN circuit continuity: CAN Hi; Refer to Section 4.2 CAN Lo; Refer to Section 4.2. If good continuity is not present, check connectors and wiring between terminals for damage, moisture or corrosion.