ABS Diagnostics

The antilock brake control module stores diagnostic information that, when accessed with a Scan tool, will provide detailed diagnostic information, should a fault be present. Fifty-six codes are provided to assist with ABS system diagnosis. Diagnostics will also reveal whether or not the fault is intermittent. With the ABS diagnostic system, fault codes can only be read and cleared with a Scan Tool. However, if no faults occur for 100 drive cycles (a drive cycle occurs if the ignition is turned On and the vehicle is driven faster than 17 km/h [10 mph]), fault codes are cleared from the antilock brake control module.

Should multiple ABS system malfunctions occur, the first five fault codes will be stored in Malfunction History in the order in which they occurred (least recent to most recent). This can be useful, since one primary fault can often cause other secondary faults to occur. In such cases, knowing the order in which these faults occurred provides useful diagnostic information.