Test NTC-10B: Checking Oxygen Sensor Switching
NOTE:
Perform TEST NTC-10A before proceeding.
- Start engine. Allow engine to idle. Inspect engine for any abnormal vacuum conditions which may indicate a possible engine mechanical problem. If abnormal vacuum conditions are present, repair engine as necessary. Perform TEST VER-2A . If abnormal vacuum conditions are not present, go to next step.
- Using scan tool, read O2S signal voltages. If O2S signal voltage is .10 volt or more for either O2S, go to step 4) . If O2S signal voltage is less than .10 volt for either O2S, go to next step.
- Turn ignition off. Disconnect O2S connector that was less than .10 volt. For O2 sensor/model identification see O2 SENSOR IDENTIFICATION table. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of O2S signal circuit at O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If resistance is less than 5 ohms, repair short to ground on O2S signal circuit. Perform TEST VER-2A . If resistance is 5 ohms or more, replace O2S. Perform TEST VER-2A .O2 SENSOR IDENTIFICATION
Application Location O2S 1/1 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 O2S 1/2 Avenger, Sebring Coupe & Talon 4-Cylinder Downstream O2S V6 Rear Bank Downstream O2S Breeze, Cirrus, Neon, Sebring Conv. & Stratus 4-Cylinder & V6 Downstream O2S O2S 2/1 Avenger & Sebring Coupe V6 Front Bank Upstream O2S O2S 2/2 Avenger & Sebring Coupe V6 Front Bank Downstream O2S NOTE: During next step, observe downstream O2S voltage does not switch like upstream O2S voltage. - Using scan tool, reset adaptive fuel memory. Ensure engine is at normal operating temperature. Using scan tool, read O2S signal voltages for 10 or more seconds. If O2S signal voltages are switching normally, O2 sensors are functioning normally. Test is complete. If O2S signal voltages are not switching normally, go to TEST NTC-13A .
O2S 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 1/2 Sensor Signal Circuit | ||
| Avenger, Sebring Coupe & Talon | White/Dark Green | |
| Breeze, Cirrus, Neon, Sebring Conv. & Stratus | Tan/White | |
| O2S 2/1 Sensor Signal Circuit | ||
| Avenger & Sebring Coupe V6 | Dark Green/Black | |
| O2S 2/2 Sensor Signal Circuit | ||
| Avenger & Sebring Coupe V6 | White/Red | |