Test NTC-11A: Checking Oxygen Sensor Heater
NOTE:
Perform TEST NTC-1A or TEST NTC-10A
before proceeding.
- For O2 sensor/model identification see O2 SENSOR IDENTIFICATION table. Turn ignition on. Using scan tool, actuate O2S heater test. Wait 2 minutes for O2S voltages to stabilize. Using scan tool, read upstream O2S voltage(s). If upstream voltage(s) is .4-.6 volt, go to next step. If upstream voltage(s) is not .4-.6 volt, go to step 4)
.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 - If upstream voltage(s) stays .4-.6 volt, this indicates a problem with an O2S circuit. Ensure scan tool is still actuating O2S heater test. Disconnect upstream O2S connector (on 2.5L engine, disconnect each side separately). Using a voltmeter, check voltage of ASD relay output circuit at O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit from upstream O2S connector (harness side) to splice. Perform TEST VER-2A .
- Using scan tool, stop O2S heater test. Using an ohmmeter, check resistance of heater ground circuit at upstream O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If resistance is less than 5 ohms, replace appropriate upstream O2S. Perform TEST VER-2A . If resistance is 5 ohms or more, repair open heater ground circuit to appropriate upstream O2S. Perform TEST VER-2A .
- With scan tool still actuating O2S heater test, using scan tool, read downstream O2S voltage(s). If downstream voltage(s) is .4-.6 volt, go to next step. If downstream voltage(s) is not .4-.6 volt, O2S heater(s) is functioning properly. Using scan tool, stop O2S heater test. O2 sensors are functioning normally. Test is complete.
- When downstream voltage(s) stays .4-.6 volt, this indicates a problem with an O2S circuit. Ensure scan tool is still actuating O2S heater test. Disconnect downstream O2S connector (on 2.5L engine, disconnect each side separately). Using a voltmeter, check voltage of ASD relay output circuit at O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit from downstream O2S connector (harness side) to splice. Perform TEST VER-2A .
- Using scan tool, stop O2S heater test. Using an ohmmeter, check resistance of heater ground circuit at downstream O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If resistance is less than 5 ohms, replace appropriate downstream O2S. Perform TEST VER-2A . If resistance is 5 ohms or more, repair open heater ground circuit to appropriate downstream O2S. Perform TEST VER-2A .
O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)
| Application | Wire Color | ||
|---|---|---|---|
| O2S ASD Relay Output Circuit | |||
| Avenger, Sebring Coupe & Talon | Black/Red | ||
| Breeze, Cirrus, Sebring Conv. & Stratus | |||
| Upstream O2S | Dark Green/Orange | ||
| Downstream O2S | Orange/Dark Green | ||
| Neon | Dark Green/Orange | ||
| O2S Heater Ground Circuit | |||
| All Models | Black | ||