Journey FWD V6-3.5L (2009)
Oxygen Sensor: Testing and Inspection
CHECKING THE OXYGEN SENSOR OPERATION
For a complete wiring diagram Refer to the Wiring Information See: Diagrams/Electrical Diagrams.
1. OXYGEN SENSOR, WIRING, OR CONNECTORS
NOTE: Diagnose and repair any O2 sensor or rationality DTCs before proceeding with this test.
NOTE: When performing this procedure as part of another diagnostic process, it may be necessary to repeat this test for all of the oxygen
sensors on the vehicle.
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen sensor and the PCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
5. Turn the ignition on.
6. Monitor the scan tool data relative to the sensor and wiggle test the wiring and connectors.
7. Look for the data to change or for a DTC to set during the wiggle test. If necessary, check each sensor circuit for high resistance or a shorted
condition.
Were any problems found?
Yes
-
Repair as necessary.
-
Perform the PCM Verification Test. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification
Tests/PCM Verification Test
No
-
Go to 2
2. OXYGEN SENSOR VOLTAGE
1. Start the engine and allow it to reach normal operating temperature.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not
wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With a scan tool, monitor all O2 Sensor voltage readings.
Is the voltage switching between 2.5 and 3.4 volts for all O2 sensors?
Yes
-
Go to 3
-
Perform the PCM Verification Test. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification
Tests/PCM Verification Test
No
-
Go to 4
3. O2 SENSOR HEATER OPERATION
1. Turn the ignition off.
NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to
stabilize at 5.0 volts.
2. Turn the ignition on.
3. With a scan tool, actuate the O2 Sensor heater.
4. With the scan tool, monitor O2 Sensor voltage for at least 2 minutes.
Does the voltage stay above 4.5 volts?
