Brake Booster Pressure Sensor Inspection (ENG A-STOP Model)
Precautions: Precautions for Brake Service · Precautions for Brakes · General safety (00)
NOTICE:
If excessive vacuum is applied, the brake booster pressure sensor may be damaged.
Do not exceed a vacuum of –100 kPa (–1.0 kgf/cm2, –14.5 psi, –1.0 bar).
1)Remove brake booster pressure sensor. 
2)Check brake booster pressure sensor output voltage as follows.
If check result is not as specified, replace brake booster pressure sensor.
If check result is not as specified, replace brake booster pressure sensor.
a)Arrange 3 new 1.5 V batteries (2) in series and check that total voltage is 4.5 – 5.0 V.
b)Connect special tool, voltmeter (3) and batteries to brake booster pressure sensor (1) as shown in figure.
| 4. | Adapter included in special tool |
c)Check that voltage varies gradually when negative pressure is gradually applied with special tool.
Vacuum sensor reference voltage
Negative pressure 0 kPa (0.0 kgf/cm2, 0.0 psi, 0.0 bar): Approx. 0.5 V
Negative pressure –100 kPa (–1.0 kgf/cm2, –14.5 psi, –1.0 bar): Approx. 3.0 V