Mazda 2002 6 - Barometric Pressure (Baro) Sensor Inspection

F–60
CONTROL SYSTEM
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See F–43 PCM
REMOVAL/INSTALLATION.)
2. Inspect the following harness for open or short.
(Continuity check)
Open circuit
• Neutral switch terminal B (harness-side) and
PCM terminal 1W (harness-side)
• Neutral switch terminal A (harness-side) and
body GND
Short circuit
• Neutral switch terminal B (harness-side) and
body GND
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BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION
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Note
• Perform the following inspection only when directed.
• The following vacuum values are indicated by relative pressure from the barometric pressure sensor.
1. Connect the SSTs (WDS or equivalent) to the DLC-2.
2. Turn the ignition switch to ON.
3. Select BARO on the SSTs (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 barometric pressure sensor.
• If as verified, go to next step.
5. Apply vacuum of –25.0 kPa {–187 mmHg, –7.38 inHg} to the barometric pressure 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 barometric pressure sensor.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See F–43 PCM
REMOVAL/INSTALLATION.)
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.
— Barometric pressure sensor terminal A
(harness-side) and PCM terminal 1G
— Barometric pressure sensor terminal B
(harness-side) and PCM terminal 2H
— Barometric pressure sensor terminal C
(harness-side) and PCM terminal 2K
Short circuit
• If there is continuity, the circuit is shorted. Repair or replace the harness.
— Barometric pressure sensor terminal C (harness-side) and power supply.
— Barometric pressure sensor terminal C (harness-side) and body GND.
— Barometric pressure sensor terminal A (harness-side) and power supply.
— Barometric pressure sensor terminal A (harness-side) and body GND
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