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 B2200 Base, 2D PickupFACTORY OEM SERVICE PROCEDURE
EGR Position Sensor
- Disconnect vacuum hose from EGR valve and connect a vacuum pump. Disconnect EGR position sensor connector. Turn ignition on. Using a voltmeter, check voltage of each terminal. See Fig 1
. See EGR POSITION SENSOR VOLTAGE
table.EGR POSITION SENSOR VOLTAGE
Terminal CODES Voltage (No Vacuum) Voltage (6 in. Hg Vac.) "A" .7 4.7 "B" 1.5 or less 1.5 or less "C" 4.5-5.5 4.5-5.5 - If voltage reading is not as specified at terminals "B" and "C", check wiring harness and ECU terminals 1D, 1F, and 1G.
- If voltage is not as specified at terminal "A", check wiring harness, ECU, and sensor resistance. Disconnect sensor connector. Using an ohmmeter, check resistance between terminals while applying 6 in. Hg to EGR control valve. Check resistance using EGR POSITION SENSOR RESISTANCE table.
EGR POSITION SENSOR RESISTANCE
| Terminals | Ohms |
|---|---|
| "B"-"C" | 5000 |
| "A"-"C" | 0-5500 |
| "A"-"B" | 700-6000 |
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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