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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 P0130: Oxygen Sensor Circuit (Sensor No. 1) >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Check for open or short circuit in wiring harness between ECM and oxygen sensor. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring harness is okay, connect scan tool. See Figure.
  2. Start engine and warm to normal operating temperature. Monitor oxygen sensor output voltage and short-term fuel trim. If scan tool indicates a lean condition (.6 volt or less, +20 trim) or rich condition (.4 volt or more, -20 trim), see DTC P0171:  SYSTEM TOO LEAN (FUEL TRIM), DTC P0172: SYSTEM TOO RICH (FUEL TRIM) circuit test.
  3. If scan tool indicates other than reading in step 2), operate engine at 2500 RPM for 90 seconds. Monitor oxygen sensor voltage. If voltage constantly fluctuates from less than .4 volt to more than .6 volt, perform TEST DRIVE CONFIRMATION. If voltage does not fluctuate as specified, replace sensor and retest.
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