Test TC-102A - Upstream O2 Sensor Slow Response
NOTE:
For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see appropriate WIRING DIAGRAMS - NON-TURBO
article.
NOTE:
2.0L is equipped with one upstream O2 sensor.
- UPSTREAM O2 SENSOR SLOW RESPONSE DTC sets if upstream O2 sensor signal voltage is switching from less than .39 volt to more than .6 volt and back fewer times than required. Possible causes are: exhaust leak, fuel contamination, dirty or wet O2 sensor connector causing voltage tracking or engine mechanical failure. Go to next step.
- 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.
- Check exhaust for excessive smoke from oil consumption. If high oil consumption is not present, go to next step. If high oil consumption is present, repair engine mechanical failure as necessary. Replace catalytic converter. Perform TEST VER-5A.
- Turn ignition off. Disconnect upstream O2 sensor connector. Using scan tool in ohmmeter mode, check resistance of sensor ground circuit at upstream O2 sensor connector (harness side). See UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open sensor ground circuit. See the UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE). Perform TEST VER-5A.
- Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector. If condition of PCM connector is okay, replace upstream O2 sensor. Perform TEST VER-5A. If condition of PCM connector is not okay, repair as necessary. Perform TEST VER-5A.