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.
1990 Mazda B2600i Base, 2D PickupFACTORY OEM SERVICE PROCEDURE
Vacuum Sensor Test
- Remove vacuum hose and attach hand-held vacuum pump to sensor. Turn ignition on. Check voltage between each terminal and ground while applying 30 in. Hg to sensor. See VACUUM SENSOR TERMINAL VOLTAGE table. See Figure and Figure .
- If voltage at terminals "A", "B", or "C" is not within specification, check wiring harness to sensor. If voltage at terminals "A", "B" or "C" is within specifications, but terminal "D" is not within specifications, replace vacuum sensor.VACUUM SENSOR TERMINAL VOLTAGE
Terminal Voltage "A" Less Than 1.5 "B" 4.5-5.5 "C" About 12 "D" 1.4-4.9
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.