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Home >> Dodge and Ram >> 1998 >> Caravan Base, 3.3 R >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls - Tests W/Codes - 2.4L) >> DTC Test >> Test TC-102A - Upstream O2 Sensor Slow Response
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Test TC-102A - Upstream O2 Sensor Slow Response

WARNING: This page is about a different variant/trim than selected.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. This Diagnostic Trouble Code (DTC) may be stored in Powertrain Control Module (PCM) if voltage on upstream oxygen sensor is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes are: dirt/moisture or grease inside connector, exhaust leak, fuel contamination or engine mechanical problem. 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 - ROAD TEST FOR OBD-II TROUBLE CODES .
  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 catalytic converter. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  4. Ensure ignition is off. Disconnect connector at upstream oxygen sensor. Upstream oxygen sensor is mounted on the exhaust manifold. Inspect connector for pushed out, miswired or damaged terminals. If terminals are not pushed out, miswired or damaged, go to next step. If terminals are pushed out, miswired or damaged, repair connector as necessary. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  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 connector for upstream oxygen sensor. The PCM is located between driver's side front fender and power distribution center, near battery. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  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 - ROAD TEST FOR OBD-II TROUBLE CODES . If connectors and terminals are not damaged, replace upstream oxygen sensor. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
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