Test NTC-8A - Checking Oxygen Sensor (O2S) Heater
WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAM section.
- Turn ignition on. Using scan tool, actuate fuel system. Wait 2 minutes for O2S voltage to stabilize. Using scan tool, read O2S voltage. If O2S voltage is .4-.6 volt, go to next step. If O2S voltage is not .4-.6 volt, system is operating properly. Test is complete.
- Disconnect O2S connector. While still actuating fuel system, put scan tool in voltmeter mode. Using scan tool, check voltage on O2S connector Dark Green/Black wire. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open Dark Green/Black wire. Perform TEST VER-2.
- Using scan tool, stop fuel system actuation. Put scan tool in ohmmeter mode. Using scan tool, check resistance on O2S connector Black/Tan wire. If resistance is more than 5 ohms, repair open Black/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace O2S. Perform TEST VER-2.