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Home >> Mazda >> 1991 >> 929 Base >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Position Sensor (TPS) >> NAVAJO
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Throttle Position Sensor (TPS): NAVAJO

NOTE: On Navajo, TPS is not adjustable. Replace TPS if voltage readings are not within specification.
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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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