Self-Test at Ignition Turn On

SELF-TEST AT IGNITION TURN ON
The system undergoes a power-up self-test when the vehicle has its initial ignition turn-on. An active self-test of the ABS system internal main relay, motor, and the six solenoid valves is performed. The power-up self-tests are abbreviated if the vehicle ignition switch is turned from some other position to RUN above 13 km/h (8 mph), as might occur in restarting a stalled engine with the vehicle rolling.

RAM AND ROM CHECKS
Ram and Rom are the two major parts of the microprocessor in the EBC 2 and EBC 325 CAB. ROM is a permanent memory that contains the program that performs all computations, makes all logic decisions, and so forth. RAM is an erasable, rewritable memory that is used to keep track of numeric computations and logic decisions as the EBC 2 and EBC 325 control program stored in ROM is executed. The RAM and ROM are checked immediately whenever the vehicle ignition is turned on.

BULB CHECKS
At ignition turn-on, the CAB also provides the operator of the vehicle with a visual check of the amber ABS warning indicator and the Red Brake Warning Indicator. When the ignition switch is turned to the RUN position, the two indicators are turned on for a few seconds. These bulb checks help confirm correct operation of both the CAB and the bulbs themselves.