Contents: Examination ⇓ Replacement ⇓
Examination
1. Brake pedal sensor (it is also known as a brake light switch) notifies the BEU that the vehicle is in braking mode. When braking, the sensor contacts close, and when the pedal is released, they open.
2. Since the sensor circuit (switch) it's also connected to the brake lights. Any malfunction in this circuit, such as a burned-out bulb, will cause problems in the engine management system, especially the idle speed control system. Therefore, if the idle speed is unstable, first of all check the operation of the brake pedal switch.
3. To identify the connector contacts, use the vehicle electrical diagrams at the end of the book.
4. Disconnect the electrical connector of the sensor and connect a voltmeter to the connector contact to which power is supplied from the battery (+) and to ground (-).
5. Turn on the ignition and read the voltmeter reading. The voltmeter should show between 10V and battery voltage.
6. Connect an ohmmeter to the sensor terminals and check the closing and opening of its contacts by turning it on and off by hand. The ohmmeter should show either zero or infinity.
7. Check the integrity of the wires from the sensor to the brake light bulbs. Replace any burnt-out bulbs or faulty wires.
Replacement
Please note: The models described in this manual are equipped with airbags. When working in the airbag area, always turn them off (see chapter 18) to avoid accidental activation, which could result in injury.
8. Remove the trim from under the instrument panel on the driver's side.
9. Disconnect the electrical connector from the pedal sensor.
Text taken from an online platform MAZBOOK
10. Turn the sensor a quarter turn and pull it out of the bracket.
12. When installing the sensor, push it into the bracket until it contacts the brake pedal. Connect the electrical connector and replace the trim.