Manifold Pressure/Vacuum Sensor: Testing and Inspection

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

1. Remove the PCM.




2. Connect the SST 104 Pin Breakout Box to the PCM as shown.
3. Tighten the connector bolt.

Tightening torque: 7.9-10.7 Nm (69.5-95.4 in.lbs.)

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

4. Turn the ignition switch to ON.




5. Apply vacuum to the EGR boost sensor according to the following procedure.

NOTE: The output voltage varies with the measuring condition.

6. Increase the applied vacuum from 0 kPa (0 in.Hg) to -81.3 kPa (-24.0 inHg) and verify that the PCM terminal 89 voltage decreases according to specifications.




7. If not as specified, perform the following inspection.
(1) Harness continuity




- Between PCM terminal 34 and EGR boost sensor terminal A
- Between PCM terminal 91 and EGR boost sensor terminal B
- Between PCM terminal 90 and EGR boost sensor terminal C

(2) If there is no continuity, repair or replace related harness.
(3) Terminal voltage (Ignition switch ON)
- EGR boost sensor terminal B voltage: Ground (Below 1.0 V)
- EGR boost sensor terminal C voltage:

Constant voltage (4.5-5.5 V)

(4) If terminal voltage is incorrect, check the PCM.

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