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Test TC-102A - O2 Sensor 1/1 Slow Response

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS section in this article. For wiring diagram, see WIRING DIAGRAMS - 2.7L article.
  1. For O2 sensor/model identification see O2 SENSOR 1/1 IDENTIFICATION table. O2 SENSOR 1/1 SLOW RESPONSE DTC sets if upstream O2S 1/1 signal voltage is switching from less than .27 volts to more than .62 volts and back fewer times than required. Possible causes are: exhaust leak, fuel contamination, O2S failure, dirty or wet O2 sensor connector causing voltage tracking or O2S heater failure. Go to next step.
  2. Start engine. Check for exhaust system leaks between engine and catalytic converter. If no exhaust system leaks are found, go to next step. If exhaust system leaks are found, repair exhaust system as necessary. Perform TEST VER-5A.
  3. Check exhaust for excessive smoke from coolant or oil consumption. If coolant or oil consumption is not present, go to next step. If coolant or oil consumption is present, repair engine mechanical failure as necessary. Replace O2S 1/1. Perform TEST VER-5A.
  4. Turn ignition off. Disconnect O2S 1/1 connector. Using an ohmmeter, check resistance of sensor ground circuit between O2S 1/1 connector (harness side) and ground. See O2S 1/1 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open sensor ground circuit. Perform TEST VER-5A.
  5. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector. If condition of PCM connector is okay, replace O2S1/1. Perform TEST VER-5A. If condition of PCM connector is not okay, repair as necessary. Perform TEST VER-5A.
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