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Test TC-32A: O2 Sensor 1/1 Stays At Center

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. For O2 sensor/model identification see O2 SENSOR 1/1 IDENTIFICATION  table. Start engine and allow it to reach operating temperature. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read O2S 1/1 state. If O2S 1/1 state is switching, go to next step. If O2S 1/1 state is not switching, go to step 5)  .
    O2 SENSOR 1/1 IDENTIFICATION

    Application Location
    Avenger, Sebring Coupe & Talon
    4-Cylinder Upstream O2S
    V6 Rear Bank Upstream O2S
    Breeze, Cirrus, Neon, Sebring Conv. & Stratus
    4-Cylinder Upstream O2S
    V6 Upstream O2S
  2. While monitoring scan tool display, wiggle O2S wiring harness. If O2S 1/1 state was locked at center at any time while wiggling wiring harness, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-5A . If O2S 1/1 state was not locked at center at any time while wiggling wiring harness, go to next step.
  3. Condition to set trouble code is not present at this time. O2 SENSOR 1/1 STAYS AT CENTER DTC sets if upstream O2S signal voltage is .35-.55 volts for 1.5 minutes. Possible causes are: O2S output circuit open, O2S failure, PCM failure, dirt and/or moisture causing voltage tracking in connector, or faulty connections or wiring. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, test is complete. Perform TEST VER-5A . If related wiring and connectors were repaired, perform TEST VER-5A .
  5. Turn ignition on with engine off. Disconnect O2S 1/1 connector. Inspect wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If wiring and connectors were repaired, perform TEST VER-5A .
  6. Using an ohmmeter, check resistance of O2S 1/1 sensor ground circuit between O2S 1/1 sensor connector (harness side) and ground. See O2S 1/1 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)  table. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open O2S 1/1 sensor ground circuit. Perform TEST VER-5A .
  7. Connect a jumper wire between O2S 1/1 connector (harness side) signal circuit and battery voltage. See O2S 1/1 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)  table. Using scan tool, read O2S 1/1 voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace O2S 1/1. Perform TEST VER-5A .
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Disconnect jumper wire from O2S 1/1 connector. Using an ohmmeter, check resistance of O2S 1/1 sensor signal circuit between O2S 1/1 connector (harness side) and PCM terminal No. 30. See O2S 1/1 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)  table. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A . If resistance is 5 ohms or more, repair open O2S 1/1 signal circuit. Perform TEST VER-5A .
O2S 1/1 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)

Application Wire Color
O2S 1/1 Sensor Signal Circuit
Avenger, Sebring Coupe & Talon White/Black
Breeze, Cirrus, Neon, Sebring Conv. & Stratus Black/Dark Green
O2S 1/1 Sensor Ground Circuit
Avenger, Sebring Coupe & Talon Black/Dark Green
Breeze, Cirrus, Neon, Sebring Conv. & Stratus Black/Light Blue
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