With Four Wheel Antilock Brakes

PURPOSE
The Controller - Antilock Brake (CAB) is mounted under the hood, separately from the valve body, and has microprocessor circuits that:
- Monitor the brake switch input to tell whether or not to prepare for possible antilock braking.
- Monitor the wheel speed sensor inputs to determine when a wheel is tending to lock up.
- Operate the integral control unit assembly during antilock braking based on comparing the speed sensors to information programmed in memory.
- Detect ABS system related problems and take diagnostic action.

OPERATION
The CAB will disable antilock control and set a soft ignition latched trouble code if it detects one of the following conditions with itself:
- (71) RAM Read/Write
- (72) ROM Checksum
- (73) Watchdog