Note
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 there is no open or short circuit, replace the barometric pressure sensor.
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 there is no open or short circuit, replace the barometric pressure sensor.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
2. Inspect the following wiring harness for open or short. (Continuity check)
Open circuit
- 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
- 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
Mazda 6 Service Manual: Vehicle speedometer sensor (vss) inspection
Visual Inspection
1. Remove the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS)
REMOVAL/INSTALLATION.)
2. Make sure that the sensor is free of any metallic shavings or particles.
If any are found on the sensor, clean them off.
3. Install the VSS. (See VEHICLE SPEEDOMETER SENSOR (VSS)
REMOVAL ...
Mazda 6 Service Manual: No. 2 all on-board diagnostic functions inoperative
When performing an asterisked (*) troubleshooting inspection, shake the
wiring harness and connectors while doing the inspection to discover whether
poor contact points are the cause of any intermittent malfunctions. If there
is a problem, check to make sure connectors, terminals and wir ...