Absolute Pressure Sensor: Testing and Inspection

COMPONENT INSPECTION








Absolute pressure sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.
3. Turn ignition switch "ON".
4. Apply vacuum and barometric pressure to absolute pressure sensor as shown in figure.
5. Check output voltage between ECM terminal (61) and (25) (ECM ground).

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) and over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.

6. If NG, replace absolute pressure sensor.





Absolute pressure sensor
1. Turn ignition switch "ON" and check voltage between ECM terminals (51) and (25).
The voltage should be more than 2.6V.

2. Start engine and wait at least 5 seconds and check voltage between ECM terminals (51) and (25).
The voltage should be less than the value measured at step 1.
If NG, go to step 3; if OK, inspection end.

3. Turn ignition switch "OFF".
4. Remove absolute pressure sensor with its harness connector connected.
5. Remove hose from absolute pressure sensor.
6. Turn ignition switch "ON" and check output voltage between terminal (2) and engine ground.
The voltage should be 3.2 to 4.8V.

7. Use pump to apply vacuum of -26.7 kPa (-200 mm Hg, -7.87 inHg) to absolute pressure sensor as shown in figure and check the output voltage.
The voltage should be 1.0 to 1.4V lower than the value measured in step 6.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below 93.3 kPa (-700 mmHg, -27.56 inHg) or over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.

8. If NG, replace absolute pressure sensor.









MAP/BARO switch solenoid valve
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. Check the time required for the solenoid valve to switch. It should be less than 1 second.
4. If NG, replace MAP/BARO switch solenoid valve.