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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 P0136: Heated Oxygen Sensor Circuit (Sensor No. 2) >> Diagnosis & Repair
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Diagnosis & Repair

  1. If any codes are displayed other than DTC P0136, diagnose and repair those codes first. If only DTC P0136 is displayed, check for open or short circuit in wiring harness between ECM and sensor. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
  2. If wiring harness is okay, connect scan tool. See Figure. Start and warm engine to normal operating temperature. Monitor sensor No. 2 output voltage. Snap accelerate engine 3 times. Voltage should fluctuate from less than .4 volt to .5 volt or more.
  3. If voltage fluctuates as specified, check sensor wiring harness connector. Problem may be intermittent. If voltage does not fluctuate as specified, replace sensor and retest.
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