Barometric Pressure Sensor: Testing and Inspection
EGR BOOST SENSOR INSPECTIONBarometric Pressure Signal Side
NOTE: The following vacuum and pressure values are indicated by relative pressure from atmospheric pressure.
1. Connect the Special Service Tools to the PCM as shown.
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. Decrease the applied pressure from 5.4 kPa (1.6 in.Hg) to -54.6kPa (-16.1 in.Hg) and verify that the PCM terminal 3H voltage decreases accordingly.
NOTE: The output voltage varies with to the measuring condition.
Measuring Conditions
- Input voltage / 5.0 V
- Atmospheric pressure / 101.3 kPa (29.9 in.Hg)
- Outside temperature / 25°C (77°F)
4. If not as specified, perform the following inspection.
A. Harness continuity
- Between PCM terminal 3I and EGR boost sensor terminal B.
- Between PCM terminal 3O and EGR boost sensor terminal C.
- Between PCM terminal 3H and EGR boost sensor terminal D.
B. Terminal voltage
- EGR boost sensor terminal B voltage: Constant voltage (4.5-5.5 V)
- EGR boost sensor terminal C voltage: Ground (Below 1.0 V)
5. If terminal voltage is correct and there is harness continuity, replace the EGR boost sensor.
EGR Boost Signal Side
NOTE: The following vacuum and pressure values are indicated by relative pressure from atmospheric pressure.
1. Connect the Special Service Tools to the PCM as shown.
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 - 6.7 kPa (-2.O in.Hg) to -66.7kPa (-19.7 in.Hg) and verify that the PCM terminal 3N voltage decreases accordingly.
NOTE: The output voltage varies with the measuring condition.
Measuring Conditions:
- Input voltage / 5.0 V
- Atmospheric pressure / 101.3 kPa (29.9 in.Hg)
- Outside temperature / 25°C (77°F)
4. If not as specified, perform the following inspection.
A. Harness continuity
- Between PCM terminal 3N and EGR boost sensor terminal A.
- Between PCM terminal 3I and EGR boost sensor terminal B.
- Between PCM terminal 3O and EGR boost sensor terminal C.
B. Terminal voltage
- EGR boost sensor terminal B voltage: Constant voltage (4.5-5.5 V)
- EGR boost sensor terminal C voltage: Ground (Below 1.0 V)
5. If terminal voltage is correct and there is harness continuity, replace the EGR boost sensor.