No Communication With ECM

Symptom:
NO COMMUNICATION WITH ECM

Test 1-3:

Test 4-6:

When Monitored:
Ignition On - Continuously

Set Condition:
When the CAB fails to receive all messages from the ECM.

POSSIBLE CAUSES
- NO COMMUNICATION WITH BUS
- ENGINE CONTROL MODULE DTC(S) PRESENT
- ENGINE CONTROL MODULES POWER/GROUND CIRCUIT(S) SHORTED OR OPEN
- CAN C BUS (+)/CAN C BUS () CIRCUIT(S) OPEN TO ENGINE CONTROL MODULE
- CAN C BUS (+)/CAN C BUS () CIRCUIT(S) OPEN TO CAB
- ANTILOCK BRAKE CONTROLLER
- ENGINE CONTROL MODULE