Mazda 3 manuals

Mazda 3 Service Manual: Precaution [ABS]

1. Any one or a combination of the ABS warning and brake system warning lights illuminates even when the system is normal.

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 off the ignition once and then restarting the engine, the vehicle is driven at 10km/h {6.2 mph} or more

, and then normal operation is verified.

  • ABS: Cuts control

  • EBD:

  1. 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.

  2. 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 N drops below approx. 8 V.

*2

Battery voltage rises above approx. 8 V.

  • ABS: Cuts control

  • EBD: Cuts control

  • Brake system warning light

Brake switch signal error (stuck at on/off)

Normal operation of brake switch signal is verified

  • ABS: Operates control

  • EBD: Operates control

Brake fluid amount is low.

Brake fluid level lower than recommended amount.


*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 U3003:16.

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.

a. Malfunctions in electrical system

b. Malfunctions in hydraulic system

Intermittent Concern Troubleshooting

Vibration method

NOTE:

Inspection method for switch connectors or wiring harnesses

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition to ON (engine off).

NOTE:

3. Access PIDs for the switch you are inspecting.

4. Turn switch on manually.

5. Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID.


Inspection method for sensor connectors or wiring harnesses

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition to ON (engine off).

NOTE:

3. Access PIDs for the switch you are inspecting.

4. Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID.


Inspection method for sensors

1. Connect the M-MDS to the DLC-2.

2. Switch the ignition to ON (engine off).

NOTE:

3. Access PIDs for the switch you are inspecting.

4. Vibrate the sensor slightly with your finger.

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.

Connector terminal inspection method

1. Inspect the connection condition of each female terminal.

2. Insert a male terminal to the female terminal and inspect the female terminal for looseness.


Front ABS Wheel Speed Sensor Removal/Installation
1. Remove in the order indicated in the table. 2. Install in the reverse order of removal. 3. After installation, verify that there is no twisting in the front ABS wheel-speed sensor. ...

Rear ABS Wheel Speed Sensor Inspection
Installation Visual Inspection 1. Inspect for the following: If there is any malfunction, replace the part. a. Excessive looseness or play of the rear ABS wheel-speed sensor b. Deform ...

Other materials:

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