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Home >> Toyota >> 1997 >> Tercel 2D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes >> Circuit Tests >> DTC P0141: Heated Oxygen Sensor Circuit (Sensor No. 2) >> Diagnosis & Repair
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Diagnosis & Repair

  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM connector. Measure voltage between ground and terminal No. 21 (White/Red wire) at ECM E7 connector. See Figure. If voltage is 9-14 volts, replace ECM and retest. If voltage is not 9-14 volts, go to next step.
  2. Turn ignition off. Disconnect oxygen sensor connector. Connector is located under right side of shifter console (near shifter). Using an ohmmeter, measure resistance between sensor connector terminals No. 1 (White/Red wire) and No. 2 (Black/Red wire).
  3. If resistance is 11-16 ohms at 68°F (20°C), check wiring harness between main relay, heated oxygen sensor and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If resistance is not 11-16 ohms, replace sensor and retest.
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