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Checking Oxygen Sensor Heater

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS - 2.5L V6 article in ENGINE PERFORMANCE.
  1. Turn ignition on. Using scan tool, actuate fuel system. Wait 2 minutes for oxygen sensor (O2S) voltage to stabilize. Using scan tool, read both upstream O2S voltage values. If either upstream O2S voltage value is between .4-.6 volt, go to next step. If either upstream O2S voltage value is not .4-.6 volt, system is operating properly. Test is complete.
  2. If front upstream O2S voltage value is .4-.6 volt, go to next step. If front upstream O2S voltage value is not .4-.6 volt, go to step 5).
  3. With scan tool still actuating fuel system, disconnect front upstream O2S connector. Put scan tool in voltmeter mode. Using scan tool, check voltage on front upstream O2S connector (harness side) Black/Red wire (FJ22) body or Dark Green/Orange wire (JA body). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2.
  4. Using scan tool, stop fuel system actuation. Put scan tool in ohmmeter mode. Using scan tool, check resistance on front upstream O2S connector Black wire. If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace front upstream O2S. Perform TEST VER-2.
  5. With scan tool still actuating fuel system, disconnect rear upstream O2S connector. Put scan tool in voltmeter mode. Using scan tool, check voltage on rear upstream O2S connector (harness side) Black/Red wire (FJ22) body or Dark Green/Orange wire (JA body). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2 .
  6. Using scan tool, stop fuel system actuation. Put scan tool in ohmmeter mode. Using scan tool, check resistance on rear upstream O2S connector Black wire. If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace rear upstream O2S. Perform TEST VER-2.
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