No Communication With ECM

Symptom
NO COMMUNICATION WITH ECM

When Monitored: Ignition On - Continuously

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

POSSIBLE CAUSES
- CAN C BUS CIRCUIT(S) SHORTED OR OPEN
- ENGINE CONTROL MODULE DTC(S) PRESENT
- ENGINE CONTROL MODULE'S POWER/GROUND CIRCUIT(S) SHORTED OR OPEN
- ENGINE CONTROL MODULE
- CAN C BUS (+)/CAN C BUS CIRCUIT(S) OPEN TO ENGINE CONTROL MODULE CAB
- CAN C BUS (+)/CAN C BUS CIRCUIT(S) OPEN TO CAB

Test 1 - Test 3:

Test 4 - Test 6:

NO COMMUNICATION WITH ECM