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)NAVAJO
1991 Mazda 929 Base
Throttle Position Sensor (TPS): NAVAJO
1991 Mazda 929 BaseSECTION NAVAJO
NOTE:
On Navajo, TPS is not adjustable. Replace TPS if voltage readings are not within specification.
- Ensure throttle linkage is not preventing throttle stop lever from contacting throttle stop screw. Disconnect Electronic Control Assembly (ECA) 60-pin connector. Inspect connector for damaged pins, corrosion or loose wires and repair as necessary.
- Connect Breakout Box (T83L-50-EEC-IV) between ECA and ECA harness. Connect digital voltmeter positive lead to pin No. 47 and negative lead to pin No. 46 of breakout box.
- Turn ignition on. Observe voltmeter reading while slowly moving throttle between fully closed and wide open positions. If voltage is .34 with throttle fully closed and 4.84 with throttle fully open, TPS voltages are within specification.
- If voltages are not within specification, ensure throttle angle (minimum air rate) is correct. See IDLE SPEED under IDLE SPEED & MIXTURE. If throttle angle is correct, remove TPS.
- Check for damaged, corroded or misadjusted pins. If pins are okay, install TPS, ensuring it is correctly seated. Check voltage readings again. If voltage readings are not as specified, perform KOEO self-test. See appropriate G - TEST W/ CODES article in the ENGINE PERFORMANCE section. If KOEO self-test indicates no problems, replace TPS.
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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.