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Test TC-125A - O2 Sensor 2/2 Heater Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see WIRING DIAGRAMS - 2.0L article.
  1. For O2 sensor/model identification see O2 SENSOR 2/2 IDENTIFICATION table. Turn ignition on with engine off. Using scan tool, monitor O2S 2/2 voltage. Wait for voltage reading to stabilize between .4-.6 volt. Using scan tool, actuate O2S 2/2 heater test. Monitor O2S 2/2 voltage for 2 minutes. If O2S 2/2 voltage is still .4-.6 volt, go to step 3). If O2S2/2 voltage is not .4-.6 volt, go to next step.
    O2 SENSOR 2/2 IDENTIFICATION

    Application Location
    FJ22 Body V6 Front Bank Downstream O2S
  2. Condition to set trouble code is not present at this time. O2S 2/1 HEATER FAILURE DTC sets if sensor voltage is more than 3 volts for 30-90 seconds. Possible causes are: open heater element circuit, O2S 2/1 failure, PCM failure, dirt and/or moisture in O2S 2/1 connector or faulty O2S 2/1 heater wires. Stop all actuator tests. Test is complete. Perform TEST VER-5A.
  3. Disconnect O2S 2/2 connector. Inspect O2S 2/2 connector for damaged, pushed out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
  4. With scan tool still actuating O2S 2/2 heater test, using a voltmeter, check voltage of ASD relay output circuit on O2S 2/2 connector (harness side). See O2S 2/2 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-5A.
  5. Using scan tool, stop actuator test. Using an ohmmeter, check resistance of O2S 2/2 heater element. Measure resistance between 2 White wires on O2S 2/2 connector (component side). See O2S 2/2 CONNECTOR WIRE IDENTIFICATION (COMPONENT SIDE) table. If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace O2S2/2. Perform TEST VER-5A.
  6. Using an ohmmeter, measure resistance of O2S 2/2 heater ground circuit between O2S 2/2 connector (harness side) Black wire and ground. If resistance is less than 5 ohms, replace O2S 2/2. Perform TEST VER-5A. If resistance is 5 ohms or more, repair open Black wire. Perform TEST VER-5A.
O2S 2/2 CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)

Application Wire Color
O2S 2/2 Sensor Signal Circuit White/Red
O2S 2/2 Sensor Ground Circuit Black/Dark Green
O2S 2/2 CONNECTOR WIRE IDENTIFICATION (COMPONENT SIDE)

Application Wire Color
O2S 2/2 Signal Circuit Black
O2S 2/2 ASD Relay Output Circuit White
O2S 2/2 Heater Ground Circuit White
O2S 2/2 Ground Circuit Gray
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