Auto Test
WARNING: This page is about a different car, the 1991 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
The auto test is automatically performed once by EBCM during each ignition cycle, when vehicle reaches approximately 4 MPH. The TECH 1 will perform this test automatically during ABS TESTS mode. The auto test cycles each solenoid valve and pump motor to check component operation. If failure exists, EBCM will set a trouble code and activate SERVICE ABS light.