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variations in inflation pressure can produce inaccu- 3.2 ABS DIAGNOSTIC TROUBLE CODES The Controller Antilock Brake (CAB) may report any of several diagnostic trouble codes (DTC)s. The Diagnostic trouble codes are retained in memory until erased using the DRBIII t, or automatically erased after 255 key cycles or 3500 miles. 3.2.1 SYSTEM INITIALIZATION System initialization starts when the key is turned to “run”. At this point, the CAB performs a At 20 km/h (12 mph) a dynamic test is performed. This will momentarily run the pump/motor. If dur- If any component sets a trouble code during system initialization or dynamic check, the CAB 3.2.2 DIAGNOSTIC MODE For a Mark 20e system to enter diagnostic mode, vehicle speed must be below 10 km/h (6 mph) and t. The following are characteristics of diagnostic mode: • The amber ABS and red brake warning indicator • Antilock operation is disabled. 3.2.3 INTERMITTENT DIAGNOSTIC If the malfunction is not present while perform- ing a test procedure, the diagnostic procedures will • loose or corroded conditions • damaged components (sensors, tone wheels) • damaged wiring • excessive axle shaft runout • hydraulic system leaks • foundation (non-ABS) brake system problems If no obvious problems are found, erase diagnostic trouble codes and, with the key on, wiggle the wire 3.3 FREEZE FRAME Freeze Frame takes a ‘‘snapshot’’ of specific vehi- cle information the instant an ABS failure is recog- t to help diagnose the fault. Freeze Frame will capture the first time failure or only a new 3.4 USING THE DRBIII T Refer to the DRBIII t user’s guide for instructions and assistance with reading diagnostic trouble t functions. 3.5 DRBIII T ERROR MESSAGES Under normal operation, the DRBIII t will dis- play one of only two error messages: – User-Requested WARM Boot or User- Requested COLD Boot If the DRBIII t should display any other error message, record the entire display and call the Star ver: 2.14 Press MORE to switch between this display and the application screen. Press F4 when done noting information. 3.5.1 DRBIII T DOES NOT POWER UP (BLANK SCREEN) If the LED’s do not light or no sound is emitted at start up, check for loose cable connections or a bad 4 GENERAL INFORMATION |