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.
1987 Mazda 626 BaseFACTORY OEM SERVICE PROCEDURE
High Altitude Compensation
- Bring engine to normal operating temperature and run at idle. Connect vacuum pump to atmospheric pressure sensor. Use connector as previously shown and connect voltmeter to terminal "D" and ground. See Figure . Apply 6.10 in. Hg vacuum. Voltage should be zero.
- Release vacuum and ensure 12 volts are present. Connect voltmeter to terminal "F" and ground. Apply 3.35 in. Hg vacuum. Voltage should be zero. Release vacuum and ensure 12 volts are present. Check atmospheric pressure sensor and wiring harness if not within specifications. See COMPUTERIZED ENGINE CONTROL section.
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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