Filed Under (Mazda) by admin on 22-06-2010
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See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION. The Anti-Lock Brake System (ABS) control module senses reductions in front and rear wheel speed and modulates hydraulic pressure to the brakes to prevent wheel lock-up. The ABS consists of a hydraulic unit, 4 wheel speed sensors and sensor rotors, ABS relay (fail-safe relay and motor relay), pump motor and ABS control module. See Fig. 1. An ABS warning light is located on the instrument cluster. For more information on brake system, see BRAKE SYSTEM article. Fig. 1: Locating ABS Components (Typical) Application ABS Control Module Under Passenger Seat ABS Relay Left Front Of Engine Compartment Data Link Connector Left Side Of Engine Compartment Hydraulic Unit Left Side Of Engine Compartment Pump Motor On Hydraulic Unit
Filed Under (Mazda) by admin on 18-06-2010
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Hard Failures Hard failures cause malfunction indicator light (CHECK ENGINE) to illuminate and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, the vehicle runs but driveability will not be optimum. Intermittent Failures Intermittent failures may cause CHECK ENGINE light to flicker or illuminate and go out after the intermittent fault goes away. However, the corresponding trouble code will be retained in ECU memory. If related fault does not reoccur within a certain time frame, related trouble code will be erased from ECU memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INTERMITTENTS in H – TESTS W/O CODES article. RETRIEVING CODES Accessing Trouble Codes
