Examination
1. Brake pedal sensor (it's the brake light switch) informs the BEU that the vehicle is in braking mode. When braking, the sensor contacts close, and when the pedal is released, they open.
2. Because the sensor circuit (switch) also related to brake lights. any malfunction of this circuit, such as a burned out light bulb, will cause problems in the engine control system, especially in the idle control system. Therefore, if the idle speed is unstable, first check the operation of the brake pedal switch.
3. To identify the contacts of the connectors, use the diagrams of the electrical equipment of the car at the end of the book.
4. Disconnect the electrical connector of the sensor and connect a voltmeter to the terminal of the connector that is powered by the battery (+) and to the mass (-).
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, 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 lights. Replace burnt out light bulbs or faulty wires.
Replacement
Attention! The models described in this manual are equipped with airbags. When working in the cushion area, always turn them off (see chapter 18) to avoid accidental operation that could result in injury.
8. Remove facing from under the panel of devices from outside the driver.
9. Disconnect the electrical connector from the pedal sensor.
10. Rotate the sensor a quarter of a 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.