Symptom Troubleshooting (ABS): Other Mazda 3 BL

FOREWORD [ABS]

1. Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic inspection. To inspect the DTC, follow the DTC Inspection steps. (See «ON-BOARD DIAGNOSIS [ABS]»(ref-345282-S30452037932009102000000) .)

PRECAUTION [ABS]

1. Any one or a combination of the ABS warning and BRAKE system warning lights illuminates even when the system is normal. REFERENCE CHART Warning lights that may illuminate and/or flash Cases in which the light may illuminate Conditions in which the light will go out ABS, EBD control Either or both of the following lights illuminate: ABS warning light BRAKE system warning light( (1) ) When the front wheels are jacked up, stuck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun. After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Cuts control. EBD: Cuts control, in cases where the light may illuminate, only when ABS CM detects that a wheel speed sensor determines that more than two wheels are malfunctioning. Operates control, if wheel speed sensor determines that more than three wheels are functioning correctly. Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different. (Size, radius, tire pressure, or wear is other than that listed on tire label.) Both of the following lights illuminate: ABS warning light BRAKE system warning light Battery voltage at ABS HU/CM ignition terminal AK drops below approx. 8 V. ( (2) ) Battery voltage rises above approx. 8 V. ABS: Cuts control. EBD: Cuts control. (1) In cases where the light may illuminate, only when ABS HU/CM detects that a wheel-speed sensor determines that more than two wheels are malfunctioning. (2) If battery voltage drops below 8 V while vehicle speed is greater than 20 km/h {12.4 mph}, ABS HU/CM records DTC B1318.
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 M-MDS 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 that 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.

Scheme 63

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

Scheme 64

1. Verify the symptoms, and perform troubleshooting according to the appropriate number. PROBLEM SYMPTOMS No. Symptom 1 Neither ABS warning light nor BRAKE system warning light illuminate when the ignition switch is turned to the ON position. 2 ABS warning light does not illuminate when the ignition switch is turned to the ON position. 3 BRAKE system warning light does not illuminate when the ignition switch is turned to the ON position. 4 Both ABS warning light and BRAKE system warning light stay on 4 s or more when the ignition switch is turned to the ON position. 5 ABS warning light stays on 4 s or more when the ignition switch is turned to the ON position. 6 BRAKE system warning light stays on 4 s or more when the ignition switch is turned to the ON position. (Parking brake is released.) 7 There is a malfunction in the system even through ABS warning light, BRAKE system warning light, do not illuminate.

NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

TROUBLESHOOTING HINTS

DIAGNOSTIC PROCEDURE STEP INSPECTION ACTION 1 INSPECT FOR DTCs IN ABS HU/CM Have DTCs been stored in memory? Yes Perform the applicable DTC inspection. (See DTC Table.) No Inspect the instrument cluster. If the instrument cluster is normal, inspect CAN communication. If instrument cluster has a malfunction, go to the next step. 2 VERIFY WHETHER MALFUNCTION IS IN WARNING LIGHTS AND INDICATOR LIGHT'S COMMON POWER SUPPLY, OR IN OTHER WARNING LIGHTS AND INDICATOR LIGHTS Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position? Yes Replace the instrument cluster, (open circuit in instrument cluster) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Go to the next step. 3 INSPECT INSTRUMENT CLUSTER POWER SUPPLY FUSE Is the instrument cluster ignition power supply fuse normal? Yes Go to the next step. No Inspect for a short to ground on circuit of blown fuse. Repair or replace if necessary. Install appropriate amperage fuse. *4 VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN INSTRUMENT CLUSTER POWER SUPPLY AND INSTRUMENT CLUSTER FOR CONTINUITY) OR INSTRUMENT CLUSTER Turn the ignition switch to the ON position. Measure voltage at instrument cluster connector terminal 1G. Is the voltage approx. 12 V? Yes Replace the instrument cluster (open circuit in instrument cluster). (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .) No Inspect for open circuit in wiring harness between the instrument cluster and ground. Repair or replace if necessary. Replace the ABS HU/CM. (See ABS HU/CM REMOVAL/INSTALLATION .)

Scheme 65

1. When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.

NO.2 ABS WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

TROUBLESHOOTING HINTS

NO.3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

TROUBLESHOOTING HINTS

NO.4 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

TROUBLESHOOTING HINTS

NO.5 ABS WARNING LIGHT STAYS ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION [ABS]

TROUBLESHOOTING HINTS

NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION (PARKING BRAKE IS RELEASED)[ABS]

TROUBLESHOOTING HINTS

NO.7 THERE IS MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DO NOT ILLUMINATE [ABS]

TROUBLESHOOTING HINTS