EGR Boost Sensor Testing

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 a vacuum to the EGR boost sensor according to the following procedure.
3. Increase the applied vacuum from -6.3 kPa (-1.9 in.Hg) to -86.3 kPa (-26.0 in.Hg) and verify that the PCM terminal 3H voltage decreases accordingly.

Reference data

NOTE: The output voltage varies with the measuring condition.

Measuring condition
- Input voltage - 5.12 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 3O and EGR boost sensor terminal A
- Between PCM terminal 3H 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.