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Test NTC-8A - Checking Oxygen Sensor Heater

NOTE: Perform TEST NTC-1A or NTC-7A before proceeding.
NOTE: 2.0L is equipped with one upstream O2 sensor.
  1. Turn ignition on. Using scan tool, actuate ASD fuel system. Wait 2 minutes for O2S voltage to stabilize. Using scan tool, read upstream O2S voltage. If voltage is 0.4-0.6 volt, go to next step. If voltage is not 0.4-0.6 volt, go to step 4).
  2. When voltage stays 0.4-0.6 volt, this indicates a problem with an O2S circuit. Ensure scan tool is still actuating ASD fuel system. Disconnect upstream O2S connector. Using scan tool in voltmeter mode, check voltage of ASD relay output circuit at O2S connector (harness side). See UPSTREAM O2 SENSOR CONNECTOR WIRE ID  (HARNESS SIDE). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit from O2S connector (harness side) to splice. Perform TEST VER-2A.
  3. Using scan tool, stop ASD fuel system actuation. Using scan tool in ohmmeter mode, check resistance of heater ground circuit at upstream O2S connector (harness side). See UPSTREAM O2 SENSOR  CONNECTOR WIRE ID (HARNESS SIDE). If resistance is less than 5 ohms, replace upstream O2S. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open ground circuit to upstream O2S. Perform TEST VER-2A.
  4. With scan tool still actuating ASD fuel system, using scan tool, read downstream O2S voltage. If voltage is 0.4-0.6 volt, go to next step. If voltage is not 0.4-0.6 volt, using scan tool, stop ASD fuel system actuation. System is functioning properly. Test is complete.
  5. When voltage stays at 0.4-0.6 volt, this indicates a problem with an O2S circuit. Ensure scan tool is still actuating ASD fuel system. Disconnect downstream O2S connector. Using scan tool in voltmeter mode, check voltage of ASD relay output circuit at O2S connector (harness side). See DOWNSTREAM O2 SENSOR CONNECTOR WIRE  ID (HARNESS SIDE). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit from O2S connector (harness side) to splice. Perform TEST VER-2A.
  6. Using scan tool, stop ASD fuel system actuation. Using scan tool in ohmmeter mode, check resistance of heater ground circuit at downstream O2S connector (harness side). See DOWNSTREAM O2  SENSOR CONNECTOR WIRE ID (HARNESS SIDE) table. If resistance is less than 5 ohms, replace downstream O2S. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open ground circuit to downstream O2S. Perform TEST VER-2A.
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