System Service

System Check - Normal Operation Antilock Brake System Traction Control System:

SELF-DIAGNOSIS
In the process of controlling the antilock brake/traction control system, the EBCM/EBTCM monitors operating conditions for possible system malfunctions. By comparing system conditions against standard operating limits, certain circuit and component malfunctions can be detected. A four-digit numerical "Diagnostic Trouble Code" Is stored In computer memory when a problem Is detected by the self-diagnostic system.

To access the diagnostic trouble codes, connect a bi-directional scan tool to the data link connector DLC and follow the scan tool manufacturer's Instructions to read the diagnostic trouble codes. Once the diagnostic trouble codes have been read and the "ABS/TCS Functional Check" performed, proceed to the "Diagnostic Trouble Code Guide." To clear diagnostic trouble codes after completing repairs, use the bidirectional scan tool and then cycle the ignition switch.

HISTORY VERSUS CURRENT DIAGNOSTIC TROUBLE CODES
The diagnostic trouble codes stored In the EBCM/EBTCM are not specifically designated as "Current" or "History" diagnostic trouble codes, as are PCM diagnostic trouble codes. The amber ANTILOCK indicator does, however, assist in differentiating between current and history diagnostic trouble codes in the following manner.

^ When the amber ANTILOCK Indicator is Illuminated before entering diagnostic mode, at least one diagnostic trouble code Is current.

^ When the amber ANTILOCK Indicator Is not Illuminated before entering diagnostic mode, no diagnostic trouble code is current.

When more than one diagnostic trouble code Is stored and the amber ANTILOCK Indicator was illuminated before entering diagnostic mode, It is impossible to determine between current and history diagnostic trouble codes.