No Comm From Micro to ENCU

No communication between the APX microprocessor and the Engine Control Unit (ENCU).

Possible causes

Blown ENCU fuse
J1939 CAN cable disconnected or damaged
Ignition power failure to ENCU
Internal ENCU failure

Recommended actions

Check engine control unit fuses
Verify J1939 data wiring
Measure power voltages at ENCU pins
Replace ENCU unit if unresponsive

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