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.
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HOMESERVICE MANUALSMAZDA1988626 LX, 4D HATCHBACK, 2.2 3REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGI CONTROL SYSTEMDIAGNOSIS & TESTINGCOMPONENT TESTINGEGR POSITION SENSOR (TURBO ONLY)
1988 Mazda 626 LX, 4D Hatchback, 2.2 3
EGR Position Sensor (Turbo Only)
1988 Mazda 626 LX, 4D Hatchback, 2.2 3SECTION EGR Position Sensor (Turbo Only)
- If adapter is available, disconnect EGR position sensor connector and connect Adapter (49 G018 901 ) in harness. See Fig 1 . If adapter is not available, back probe connector with voltmeter.
- With EGR vacuum hose disconnected, connect vacuum pump. Turn ignition on and check voltages at connector. Use EGR POSITION SENSOR VOLTAGE
table to compare results.EGR POSITION SENSOR VOLTAGE
Terminal Voltage A 4.5-5.5 B Less Than 1.5 C (Without Vacuum) .25-.95 C (With Vacuum) Approx. 4 - If voltage is not correct at terminals A and B, check harness and connection at ECU connector terminals No. 2A and 2C. If voltage is not correct at terminal C, check sensor resistance, harness and ECU connector terminal No. 2F.
- Check sensor resistance according to EGR POSITION SENSOR RESISTANCE table. If resistance is not within specifications, replace sensor.
EGR POSITION SENSOR RESISTANCE
| Terminals | Ohms |
|---|---|
| A-B | 5000 |
| A-C | 700-5000 |
| B-C | 700-5000 |
RENDER: 1.0x
NO RELATED
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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.