Barometric Pressure Sensor: Testing and Inspection
BAROMETRIC PRESSURE (BARO) SENSOR INSPECTIONNOTE:
- Perform the following inspection only when directed.
- The following vacuum values are indicated by relative pressure from the BARO sensor.
1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to ON.
3. Select BARO on the WDS or equivalent.
4. Verify that the BARO PID (pressure) and barometric pressure are practically equal.
- If not as verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the BARO sensor.
- If as verified, go to next step.
5. Apply vacuum of -25.0 kPa {-187 mmHg, -7.38 inHg} to the BARO sensor, and verify that the BARO variation from that of Step 4 is approx. 25.0 kPa {187 mmHg, 7.38 inHg}.
- If not as verified, perform the "Circuit Open/Short inspection".
- If there is no open or short circuit, replace the BARO sensor.
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following wiring harness for open or short. (Continuity check)
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- BARO sensor terminal A (harness-side) and PCM terminal 1G
- BARO sensor terminal B (harness-side) and PCM terminal 2H
- BARO sensor terminal C (harness-side) and PCM terminal 2K
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- BARO sensor terminal C (harness-side) and power supply
- BARO sensor terminal C (harness-side) and body GND
- BARO sensor terminal A (harness-side) and power supply
- BARO sensor terminal A (harness-side) and body GND