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Home >> Toyota >> 1996 >> Tercel Base, Standard >> 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. Inspect circuits between ECM and oxygen sensor for opens or shorts. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If all circuits are okay, connect scan tester. See Figure.
  2. Start engine and warm to normal operating temperature. Monitor oxygen sensor output voltage and short-term fuel trim. If scan tester indicates a lean condition (.55 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 tester indicates other than reading in step 2), operate engine at 2500 RPM for 90 seconds. Monitor oxygen sensor voltage. If voltage constantly fluctuates in wide range (.3-.9 volt), perform TEST DRIVE CONFIRMATION. If voltage does not fluctuate, or stays in narrow range, replace sensor and retest.
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