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Test TC-192A - Slow Upstream O2 During Catalyst Monitor

NOTE: For connector terminal IDENTIFICATION, see the CONNECTOR IDENTIFICATION DIRECTORY. For wiring diagram, see WIRING DIAGRAMS - 2.4L article.
  1. This Diagnostic Trouble Code (DTC) may be stored in Powertrain Control Module (PCM) if upstream oxygen sensor signal voltage is switching from less than .39 volt to more than .6 volt and back fewer times than required. Possible causes are: dirt/moisture or grease on connector causing voltage tracking, exhaust leak, fuel contamination, weak upstream oxygen sensor or engine mechanical problems. Upstream oxygen sensor is mounted on the exhaust manifold. Go to next step.
  2. Start engine. Check for exhaust leaks between engine and catalytic converter. If no exhaust leaks exist, go to next step. If exhaust leaks exist, repair as necessary. Perform TEST VER-5A.
  3. Check exhaust for excessive smoke caused by coolant entering combustion chambers or high oil consumption. If no excessive smoke is caused by coolant entering combustion chambers or high oil consumption, go to next step. If excessive smoke is caused by coolant entering combustion chambers or high oil consumption, repair engine as necessary and replace upstream oxygen sensor. Perform TEST VER-5A.
  4. Ensure ignition is off. Disconnect connector at upstream oxygen sensor. Inspect connector for pushed out, miswired or damaged terminals. If terminals are pushed out, miswired or damaged, repair connector as necessary. Perform TEST VER-5A. If terminals are not pushed out, miswired or damaged, go to next step.
  5. Using ohmmeter, check resistance between ground and terminal No. 3 (Black/Light Blue wire) on wiring harness side of connector for upstream oxygen sensor. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit in Black/Light Blue wire between PCM and upstream oxygen sensor. The PCM is located between driver's side front fender and power distribution center, near battery. Perform TEST VER-5A.
  6. Ensure ignition is off. Disconnect connectors from Powertrain Control Module (PCM). The PCM is located between driver's side front fender and power distribution center, near battery.
  7. Inspect connectors for damaged terminals. If connectors or terminals are damaged, repair as necessary. Perform TEST VER-5A. If connectors and terminals are not damaged, replace upstream oxygen sensor. Perform TEST VER-5A.
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