The On-Board Diagnostic System

THE ON-BOARD DIAGNOSTIC SYSTEM
The CAB monitors the Antilock system. The CAB monitors critical input and output circuits for correct operation.

Some circuits are tested continuously; others are checked only under certain circumstances.

Each circuit malfunction detected by the CAB has a corresponding trouble code:
^ If the CAB diagnostic system senses that one of the circuits is malfunctioning, it stores the core spending trouble code in memory
^ If the malfunction goes away after the trouble code is stored, the trouble code will be erased after 50 key cycles, so long as no other DTC's were set within these 50 cycles