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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic Tests >> Test NTC-8A - Checking Oxygen Sensor (O2S) Heater

Test NTC-8A - Checking Oxygen Sensor (O2S) Heater

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. 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 DIAGRAMS  section.
  1. 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.
  2. 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.
  3. 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.
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