The EBCM performs self-diagnostics of the ABS. The EBCM
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 four 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. |
| • | Information Only Malfunction Response:
This means that the ABS is not disabled and no indicator lamp is
requested for this malfunction. ABS activity continues as it was before this
malfunction occured. |
