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 MANUALSMAZDA1991929 BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSTHROTTLE POSITION SENSOR (TPS)RX7INSPECTION
1991 Mazda 929 Base
Throttle Position Sensor (TPS): RX7: Inspection
1991 Mazda 929 BaseSECTION Inspection
- Warm engine to normal operating temperature. Turn off engine. Connect Engine Signal Monitor (499200162) between ECU and ECU wire harness using Adapter Harness (49G018903).
- Check voltages at ECU terminals 2F and 2G. See Fig 1 . See RX7 TPS VOLTAGE TABLE . If voltages are not within specification, remove engine signal monitor and adapter harness. Adjust TPS. See ADJUSTMENT.
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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.