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Symptom: NO COMMUNICATION WITH ECM When Monitored and Set Condition: NO COMMUNICATION WITH ECM 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 MODULE’S 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 ANTI-LOCK BRAKE CONTROLLER ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read CAB DTCs. Does the DRBIII t display: NO COMMUNICATION WITH BUS? All Yes → Refer to the symptom list for the appropriate diagnostic proce- dure. No → Go To 2 2 Turn the ignition on. t, read ECM DTCs. Does the DRBIII t display any DTCs? All Yes → Refer to Powertrain Diagnostic information for the related symp- tom(s). No → Go To 3 3 Turn the ignition on. t, check the TCM, IC, and ATC module for the same or similar No Communication with Engine Control Module DTC. t display same or similar DTC in TCM, IC, & ATC module? All Yes → Go To 4 No → Go To 6 52 BRAKES (CAB) |