Boost Pressure Sensor with IAT Sensor-2 Inspection
Precautions: General safety (00)
Boost Pressure Sensor
1)Remove boost pressure sensor with IAT sensor-2. 
2)Check boost pressure sensor output voltage as follows.
If faulty condition is found, replace boost pressure sensor with IAT sensor-2.
If faulty condition is found, replace boost pressure sensor with IAT sensor-2.
a)Arrange 3 new 1.5 V batteries (1) in series, and check total voltage is 4.5 to 5.0 V.
b)Connect voltmeter (2), special tool and batteries to boost pressure sensor with IAT sensor-2 as shown in figure.
c)Check voltage varies gradually when vacuum is gradually applied with special tool.
NOTE:
Environmental condition affects output voltage largely.
The sensor voltage below is reference value when measuring under the following conditions.
•Power supply voltage: 5 V
•Ambient temperature: 20 °C (68 °F)
•Atmospheric pressure: 101.3 kPa (1.0 kgf/cm2, 14.7 psi, 1.01 bar)
•Ambient temperature: 20 °C (68 °F)
•Atmospheric pressure: 101.3 kPa (1.0 kgf/cm2, 14.7 psi, 1.01 bar)
Boost pressure sensor reference voltage
Atmospheric pressure: Approx. 1.74 V
Vacuum –30 kPa (–0.3 kgf/cm2, –4.4 psi, –0.3 bar): Approx. 1.30 V
Vacuum –60 kPa (–0.6 kgf/cm2, –8.7 psi, –0.6 bar): Approx.0.86 V
IAT Sensor-2
1)Remove boost pressure sensor with IAT sensor-2.
2)Check that resistance between sensor terminals varies depending on temperature while blowing hot air to temperature sensing part of boost pressure sensor with IAT sensor-2 (1) using hot air drier (2).
If faulty condition is found, replace boost pressure sensor with IAT sensor-2.
If faulty condition is found, replace boost pressure sensor with IAT sensor-2.
IAT sensor-2 resistance
–20 °C (–4 °F): 14.8 to 16.1 kΩ
20 °C (68 °F): 2.42 to 2.58 kΩ
80 °C (176 °F): 0.32 to 0.33 kΩ
| 3. | Thermometer |