Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM1995PICKUP R3500, 2D PICKUP, 8.0 W, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.9LSELF-DIAGNOSTIC TESTSTEST NTC-8B - CHECKING O2S HEATER
1995 Dodge and Ram Pickup R3500, 2D Pickup, 8.0 W, RWD, Automatic
Test NTC-8B - Checking O2S Heater
1995 Dodge and Ram Pickup R3500, 2D Pickup, 8.0 W, RWD, AutomaticSECTION Test NTC-8B - Checking O2S Heater
NOTE:
For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.
- Turn ignition on. Using scan tool, actuate ASD fuel system. Wait 2 minutes for O2S voltage to stabilize. Using scan tool, read O2S voltage. If voltage is less than 4.8 volts, O2S is functioning properly. Test is complete. If voltage is more than 4.8 volts, go to next step.
- Disconnect O2S connector. Using scan tool in voltmeter mode, check voltage on O2S connector (harness side), ASD relay output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire or Orange/Dark Blue wire. Perform TEST VER-2.
- If voltage is more than 10 volts, use scan tool to stop ASD fuel system actuation. Using scan tool in ohmmeter mode, check resistance on O2S connector (harness side), heater ground (Black/White wire). If resistance is more than 5 ohms, repair open Black/White wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace O2S. Perform TEST VER-2.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.