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
EGR Position Sensor Test
- Disconnect vacuum hose from EGR valve and connect vacuum pump. Disconnect EGR position sensor connector. Turn ignition on. Check voltage of each terminal. See Figure . See EGR POSITION SENSOR VOLTAGE table.
- If voltage reading is not as specified at terminals "B" and "C", check wiring harness and ECU terminals "1D", "1F", and "1G". See PIN VOLTAGE CHART S and SENSOR RANGE CHARTS articles.
- If voltage is not as specified at terminal "A", check wiring harness and ECU. Disconnect sensor connector. Using an ohmmeter, check resistance between sensor terminals while applying 6 in. Hg to EGR control valve. See EGR POSITION SENSOR RESISTANCE table.
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.