Barometric Pressure Sensor: Testing and Inspection

INSPECTION
Barometric Pressure Signal Side
- Connect the SSTs (Engine signal monitor) to the PCM.
- Turn the ignition switch to ON (engine OFF).
- Measure the voltage at PCM terminal 3H.

Specification: Approx. 4.0 V
(When standard barometric pressure 101.3 kPa (29.9 in Hg)

- If not as specified, inspect the harness and connectors.
- If these harness and connector and OK, replace the EGR boost sensor.

EGR Boost Signal Side




- Connect the SSTs (Engine signal monitor) to the PCM and connect a vacuum pump to the EGR boost sensor.
- Turn the ignition switch to ON (engine OFF).




- Apply vacuum of 20 kPa (5.9 in Hg) to the EGR boost sensor.
- Measure and record the voltage at PCM terminal 3N voltage.
- Further apply vacuum to 43 kPa (12.7 in Hg).
- Measure the voltage at PCM terminal 3N. Verify that the difference between the voltages noted in steps 4 and 6 is as specified.

Specification: Approx. 1.5 V

- If not as specified, inspect the harness and connectors.
- If these harness and connector and OK, replace the EGR boost sensor.

USING THE NGS
Barometric Pressure Signal Side
- Connect the SSTs (NGS) to the data link connector-2.
- Turn the ignition switch to ON (engine OFF).




- Select the PID/DATA MONITOR AND RECORD function on the NGS display.
- Select the "BARO V" on the NGS display. NGS measure the Barometric pressure signal voltage.

Specification: Approx. 4.0 V
(When standard barometric pressure 101.3 kPa (29.9 in Hg)

- If not as specified, inspect the harness and connectors.
- If these harness and connector and OK, replace the EGR boost sensor.

EGR Boost Signal Side
- Connect the SSTs (NGS) to the data link connector-2.
- Turn the ignition switch to ON (engine OFF).
- Select the PID/DATA MONITOR AND RECORD function on the NGS display.
- Select the "EGRB V" and apply vacuum of 20 kPa (5.9 in Hg) to EGR boost signal voltage.
- Measure and record the EGR boost signal voltage.
- Further apply vacuum to 43 kPa (12.7 in Hg).
- Measure the EGR boost signal voltage. Verify the difference between the voltages noted in steps 5 and 7 is as specified.

Specification: Approx. 1.5 V

- If not as specified, inspect the harness and connectors.
- If these harness and connector are OK, replace the EGR boost sensor.