CX-7 FWD L4-2.3L Turbo (2010)
Oxygen Sensor: Testing and Inspection
AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3 WITH TC]
NOTE:
-
Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. See: Description and
Operation
A/F Sensor Current Inspection
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
-
Vehicle speed (PID: VSS)
-
Engine speed (PID: RPM)
-
A/F sensor current (PID: O2S11)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
4. Verify that the A/F sensor current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.
-
If not within the specification, inspect the A/F sensor for an open or short circuit. Then if there is no malfunction in the wiring harness, replace
the A/F sensor.
A/F Sensor Heater Resistance Inspection
1. Disconnect the A/F sensor connector.
2. Measure the resistance between A/F sensor terminals 2B and 2D.
-
If not within the specification, replace the A/F sensor. (See See: Service and Repair.)
A/F sensor heater resistance
-
1-10 ohms