LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 1997 >> Wrangler SE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.5L >> Trouble Code Tests >> Test TC-104A - 1/2 O2 Sensor Slow Response
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test TC-104A - 1/2 O2 Sensor Slow Response

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
NOTE: 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position.
  1. Start engine. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary and perform TEST VER-5A. If exhaust system is okay, go to next step.
  2. Check exhaust for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary, replace catalytic converter and HO2Ss, and perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
  3. Turn ignition off. Disconnect 1/2 HO2S connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-5A. If connector and terminals are okay, go to next step.
  4. Using an external ohmmeter, check resistance between ground and 1/2 HO2S connector), sensor ground circuit (Brown/Yellow wire). If resistance is 5 ohms or more, repair open sensor ground circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
  5. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, replace 1/2 HO2S and perform TEST VER-5A.
scientia non olet · About LEMON Manuals