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.
1994 Mazda 929FACTORY OEM SERVICE PROCEDURE
EGR Position Sensor
- Disconnect EGR position sensor electrical connector. Connect ohmmeter to EGR position sensor. Disconnect vacuum hose from EGR control valve. Apply vacuum to EGR control valve.
- Check sensor resistance between indicated terminals. See EGR POSITION SENSOR RESISTANCE table. If resistance is not within specifications, replace sensor.
EGR POSITION SENSOR VOLTAGE
| Terminal (ECU) | Volts | |
|---|---|---|
| "A" (2J) | ||
| Without Vacuum | About 0.7 | |
| With 5.9 In. Hg | About 4.7 | |
| "B" (3D) | Less Than 1.5 | |
| "C" (2I) | 4.5-5.5 | |
EGR POSITION SENSOR RESISTANCE
| Terminals | Ohms |
|---|---|
| "A" & "B" | 700-5000 |
| "A" & "C" | 700-5000 |
| "B" & "C" | 5000 |
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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