Diagnostic Trouble Code (DTC) Information ECM-511D

Condition 

The diagnostic trouble code (DTC) (signal missing) is stored in the engine control module (ECM) if the CAN communication between the brake control module (BCM) and the engine control module (ECM) is lost or disrupted.

A fault message is transmitted to the engine control module (ECM) and a diagnostic trouble code (DTC) (faulty signal) is stored in engine control module (ECM) if a fault in the speed signal is detected in the brake control module (BCM).

Diagnostic trouble codes (DTCs) for the vehicle speed sensor (VSS) signal are stored in the brake control module (BCM).

Substitute Value 

• Cruise control is switched off
• The speed signal from the transmission control module (TCM) is used. (AUT)
• The speed signal from the brake control module (BCM) is set at 6 km/h (MAN).

Possible Source 

Signal missing 

• Contact resistance in the control area network (CAN) terminals
• Open-circuit in one or both CAN cables
• Short-circuit to ground, voltage or each other in one or both signal cables
• Damaged brake control module (BCM)
• Damaged engine control module (ECM).

Faulty signal 

• Fault trace the brake control module (BCM).

Fault symptom[s] 

• The cruise control does not function at all.