Description of On-Board Diagnostics
SELF TESTSThe system software includes several self tests that are performed every time the ignition is turned on and the vehicle is driven. Some of the self tests occur immediately, while others occur under normal driving conditions while not in antilock operation. The CAB checks continuously for a missing or erratic WSS signals/circuits, tone wheels, solenoids, pump motor or solenoid relay by performing several tests such as: dynamic, static, ohmic, voltage drop, and timed response. If any component exhibits a fault during testing, the CAB will request to illuminate the ABS and TCS warning indicators.