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Test TC-122A - Right Upstream O2 Sensor Slow Response

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
  1. Warm engine to more than 180°F (82°C). Wait 4 minutes with engine running. Using scan tool, read right O2 sensor voltage. If voltage is 1.5 volts or less, go to next step. If voltage is more than 1.5 volts, go to step 5).
  2. Observe scan tool voltmeter. Wiggle right upstream O2 sensor wiring harness. If right upstream O2 sensor voltage is 1.5 volts or less, go to next step. If right upstream O2 sensor voltage is more than 1.5 volts at any time, repair intermittent short to voltage in wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-5A.
  3. Condition to set trouble code is not present at this time. RIGHT UPSTREAM O2 SENSOR SLOW RESPONSE DTC sets if right upstream O2 sensor voltage is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes are: exhaust system leak, fuel contamination, dirt, grease or moisture in O2 sensor connector or engine mechanical failure. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-5A. If related wiring and connectors were repaired, perform TEST VER-5A.
  5. Disconnect right upstream O2 sensor connector. If right upstream O2 sensor voltage is 1.5 volts or less, go to next step. If right upstream O2 sensor voltage is more than 1.5 volts, repair short to voltage on right upstream O2 sensor signal circuit. See RIGHT UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE) . Perform TEST VER-5A.
  6. Perform O2 sensor heater test to verify O2 sensor heater is okay. A malfunctioning O2 sensor heater will cause O2 sensor voltage to remain at more than 1.5 volts. Go to next step to perform O2 sensor heater test.
  7. Using an external ohmmeter, check resistance between 2 White wires on right upstream O2 sensor connector (sensor side). If resistance is 4-7 ohms, O2 sensor heater is okay, go to next step. If resistance is not 4-7 ohms, O2 sensor heater is malfunctioning. Replace right upstream O2 sensor. Perform TEST VER-5A.
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