Barometric Pressure Sensor: Testing and Inspection

EGR BOOST SENSOR INSPECTION




NOTE: The following vacuum and pressure values are indicated by relative pressure from atmospheric pressure.




1. Connect the Special Service Tools Engine Signal Monitor to the PCM.

CAUTION: Do not apply a vacuum or pressure outside of the specified limits. Doing so will damage the EGR boost sensor.

2. Apply pressure then vacuum to the EGR boost sensor according to the following procedure.
3. Increase the vacuum from -6.3 kPa (-1.9 in.Hg) to -86.3 kPa (- 26.0 in.Hg) and verify that the voltage at PCM terminal 3M decreases accordingly.

NOTE: The output voltage varies with the measuring condition.

Measuring condition:
- Input voltage - 5 V
- Outside temperature - 25°C (77°F)
- Atmospheric pressure - 101.3 kPa (29.9 in Hg)




4. If not as specified, perform the following inspection.




a. Harness continuity:
- Between PCM terminal 4E and EGR boost sensor terminal A.
- Between PCM terminal 3M and EGR boost sensor terminal B.
- Between PCM terminal 3I and EGR boost sensor terminal C.

b. Terminal voltage:
- EGR boost sensor terminal A voltage: Below 1.0 V (Constant).
- EGR boost sensor terminal C voltage: Approx. 5.0 V (Ignition switch ON).

5. If terminal voltage is correct and there is harness continuity, replace the EGR boost sensor.