Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1986 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
Atmospheric Pressure Sensor
- Remove rubber cap from sensor. Attach hand-held vacuum pump to port on sensor. See Fig 1 . Turn ignition on and check voltage between each terminal and ground. See ATMOSPHERIC PRESSURE SENSOR SPECIFICATIONS table.
- If voltage at terminal "A", "C", or "D" is incorrect, check wiring harness. If voltage at terminal "A", "C", and "D" is correct, but voltage at terminal "B" is incorrect, replace atmospheric pressure sensor.
ATMOSPHERIC PRESSURE SENSOR SPECIFICATIONS
| Terminal | Voltage |
|---|---|
| A | About 12 |
| B | 1.4-4.9 |
| C | Below 1.5 |
| D | 4.5-5.5 |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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