Auto Service Professional

DEC 2018

Magazine for the auto service professional

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46 A S P D e c e m b e r 2 018 A B S the driver releases the brake pedal, hill start as- sist utilizes the valves in the HCU to hold the car stationary for up to 2 seconds, giving the driver time to accelerate the vehicle. As the vehicle accel- erates, hill start assist gradually releases the brake pressure to make sure that the vehicle is neither rolling back nor driving off until there is sufficient driving torque to accelerate the vehicle forward. Hill start assist also functions if the vehicle is facing downhill if the reverse gear is selected. is is just one of the systems that is taken into consideration by the ABS on this vehicle. No matter what you are working on, it is ex- tremely important that you understand the system and how it works. If you don't understand how it works, how are you going to properly repair it? New vehicle technology keeps changing, seemingly at the speed of light. Will you be able to keep up or will your ABS hold you back? ■ Edwin Hazzard owns South East Mobile Tech in Charleston, S.C., which is a mobile diagnostic and programming service providing technical service to many automotive and body repair shops. He has 35 years' experience in the automotive industry. He currently is an automotive trainer, a board member of TST (Technician Service Training), a member of the MDG (Mobile Diagnostic Group), a member of the Professional Tool and Equipment advisory board for Pten magazine, a committee member of Nastaf, and is a beta tester for multiple tool makers. Figure 10: The brake booster sensor is used to signal the EBCM that a hill start assist is needed. Figure 9: The scan tool can be used to perform a bidirectional test to activate the solenoids.

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