Diagnostic Command Modes
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
The 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 the pump motor active test occurs under normal driving while not in antilock operation with speeds above 15 MPH. Also, when over 8 MPH the CAB checks continuously for a missing or erratic wheel speed sensor signal.