Symptom Troubleshooting (ABS): Other Mazda 3 BK

FOREWORD

1. Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic inspection. To inspect the DTC, follow the DTC Inspection steps. (See «DTC TABLE»(ref-177721-S29316152272005060400000) .)

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1. Any one or a combination of the ABS warning and BRAKE system warning lights illuminates even when the system is normal.
2. Precautions during servicing of ABS The ABS is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunctions in electrical system The ABS hydraulic unit and control module (ABS HU/CM) has an on-board diagnostic function. With this function, the ABS warning light and/or BRAKE system warning light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are recorded in the ABS HU/CM. This function can find malfunctions that do not occur during periodic inspections. Connect the WDS or equivalent to the DLC-2. The stored malfunctions will be displayed in the order of occurrence. To find out the causes of ABS malfunctions, use these on-board diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The ABS HU/CM usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the ABS HU/CM memory. Also, if the ABS related parts have been replaced, verify that the no DTC has been displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the ABS CM (ABS motor or ABS motor relay or solenoid valve), the ABS warning light may not go out ( * ) even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of 10 km/h {6.2 mph} or more, make sure the ABS warning light goes out, and then clear the DTC. * The BRAKE system warning light also illuminates when any two wheels malfunction, or battery voltage drops below 8 V. When repairing, if the ABS related connectors are disconnected and the ignition switch is turned to the ON position, the ABS CM will mistakenly detect a fault and record it as a malfunction. To protect the ABS HU/CM, make sure the ignition switch is turned off before connecting or disconnecting the ABS CM connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in an ABS component or the conventional brake system. The ABS hydraulic unit contains delicate mechanical parts. If foreign material enters into the component, the ABS may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the ABS does not. Make sure foreign material does not enter when servicing the ABS (e.g. brake fluid replacement, pipe removal).

Malfunction data monitor method

1. Perform malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.

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1. Inspect the connection of each female terminal.
2. Insert the male terminal to the female terminal and Inspect the female terminal for looseness.

1. Verify the symptoms, and perform troubleshooting according to the appropriate number.

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