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Test TC-130A - O2S 2/2 Stays At Center

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see WIRING DIAGRAMS - 2.0L article.
  1. For O2 sensor/model identification see O2 SENSOR 2/2 IDENTIFICATION table. Turn ignition on with engine off. Using scan tool, monitor O2S 2/2 voltage. Wait for voltage reading to stabilize between .4-.6 volt. Using scan tool, actuate O2S 2/2 heater test. Monitor O2S 2/2 voltage for 2 minutes. If O2S 2/2 voltage is still .4-.6 volt, go to step 4). If O2S 2/2 voltage is not .4-.6 volt, go to next step.
    O2 SENSOR 2/2 IDENTIFICATION

    Application Location
    FJ22 Body V6 Front Bank Downstream O2S
  2. Using scan tool, stop actuation test. Turn ignition off. Disconnect O2S 2/2 connector. Inspect O2S 2/2 connector for damaged, pushed out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
  3. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged, pushed out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, replace O2S 2/2. Perform TEST VER-5A.
  4. Using scan tool, stop actuation test. Turn ignition off. Disconnect O2S 2/2 connector. Inspect O2S 2/2 connector for damaged, pushed out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
  5. Using an ohmmeter, check resistance of O2S ground circuit at O2S connector (harness side). See O2S 2/2 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.
    O2S 2/2 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)

    Application Wire Color
    O2S 2/2 Sensor Signal Circuit White/Red
    O2S 2/2 Sensor Ground Circuit Black/Dark Green
  6. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged, pushed out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
  7. Using an ohmmeter, measure resistance of O2S 2/2 signal circuit between O2S 2/2 connector (harness side) and PCM connector terminal No. 1. See O2S 2/2 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 O2S signal circuit. Perform TEST VER-5A.
  8. Reconnect PCM connector. Turn ignition on. Connect a jumper wire between O2S signal circuit and sensor ground circuit terminals at O2S 2/2 connector (harness side). See O2S 2/2 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. Using scan tool, read O2S 2/2 volts. If voltage less than 0.2 volt, replace O2S 2/2. Perform TEST VER-5A. If voltage is 0.2 volt or more, replace PCM. Perform TEST VER-5A.
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