The EBCM performs self-diagnostics of the ABS, and detects and isolates system malfunctions. When a malfunction is detected, the EBCM sets a corresponding diagnostic trouble code (DTC).

Malfunction Response

ABS response to malfunctions falls into three classes:

Permanent Latched Malfunction Response:  This means that the ABS is disabled and the ANTILOCK indicator lamp is requested on (whenever the ignition is turned on) even if the cause of the malfunction goes away. The only way to restore normal ABS operation is to take the vehicle to an authorized service center to have the cause of the malfunction corrected and the system reset by an electronic command sequence.

Ignition Latched Malfunction Response: This means that the ABS is disabled and the ANTILOCK indicator lamp is requested on until the ignition is turnes off even if the cause of the malfunction goes away. When the ignition is turned on again, the ABS will not be disabled unless/until a subsequent malfunction is detected.

Condition Latched Malfunction Response: This means that the ABS is disabled and the ANTILOCK indicator lamp is requested on only as long as the apparent malfunction condition persists. Normal ABS operation resumes automatically and the ANTILOCK indicator is requested off as soon as the problem goes away; no service is necesary. The vehicle operator may choose, without being prompted further by the ANTILOCK indicator lamp, to take the vehicle to an authorized service center.