![]() Auto repair today often requires as much preliminary research as it does diagnosis before you can accurately identify and fix a fault. In any event, once you read an ABS code by whatever means, the next step is to refer to the vehicle manufacturer’s diagnostic charts and wiring diagrams. Some of the older systems provide manual flash codes (Toyota rear-wheel ABS and Kelsey-Hayes RWAL, for example), and on some vehicles ABS codes can be accessed through the driver information center using a special diagnostic procedure. With few exceptions, reading ABS codes requires a scan tool (usually a factory scan tool or an equivalent aftermarket professional grade scan tool with ABS-capable software). If it’s a newer vehicle with traction control and/or stability control, those functions may also be disabled. But on vehicles that also use the ABS system for power-assisted braking, it will cause an increase in pedal effort when braking. On most vehicles, this should not affect normal braking. At the same time, the ABS system will usually disable itself. Serious faults that affect the ability of the system to operate normally will set a diagnostic trouble code and turn on the ABS warning lamp. ![]() Most newer systems are “four channel” systems with a separate wheel-speed sensor for each wheel.Īs a rule, serious ABS faults (like a wheel speed failure, accumulator leak, pump motor failure, shorted or open ABS solenoid valve, etc.) will usually be detected by the ABS self-diagnostics. ![]() Some of the older systems were “three channel” control systems that used a single wheel-speed sensor for both rear wheels. A vacuum booster is used for power assist and the ABS system only comes into play when wheel slip is detected while braking. Non-integral ABS systems that use a conventional master cylinder and a separate ABS hydraulic modular. The Teves Mark 2 accumulators contain more than 2,700 psi, so they must be depressurized prior to working on the brakes by pumping the brake pedal 25 to 40 times while the key is off. The only integral ABS system used on import applications is the Teves Mark 2, found on 1987 & up Saab 9000, 1988 to 1989 Merkur Scorpio, 1988 to 1991 Peugeot 505, 1991 & up Saab 900, and 1991 & up Volkswagen Passat. The ABS pump and accumulator provide power-assisted braking and no vacuum booster is used. Older “integral” ABS systems that combine the master cylinder and ABS hydraulic modular into a large and very expensive assembly. These repair solutions will cover more than six-million vehicles on the road today.ĭavid Hirschhorn, Director of Brand Management In a 45-minute webinar sponsored by CRP Automotive, the company that brings you Rein Automotive, we will cover six common cooling system repairs on BMW, Audi and VW vehicles. These solutions can simplify a repair and protect against future failures. These parts can create a win/win situation for your shop and customers when dealing with today’s vehicle’s complexity and longevity. Some replacement parts can be better than the original parts. It could be hoses, plastic couplings or water pumps. ![]() Have you ever noticed many European cars and SUVs no longer have coolant replacement intervals listed in the service information? This could be due to cooling systems requiring service or component replacement prior to that interval. Sponsored By CRP Automotive, the company that brings you REIN Automotive
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