For 1990-2009 cars

### Controller Fault

The ABS module perform a self check for the following:

• | Ability of the controller to execute valid instructions.

• | Random access memory (RAM) integrity.

• | Read only memory (ROM) integrity.

• | Microprocessor wheel speed circuitry.

If a problem is detected, ABS will be disabled and the antilock telltale will be turned On.

### Diagnostic Aids

If code 82 is also set, recalibrate ABS control module. If code 55 is the only code, replace the ABS control module.