Air Fuel Ratio Sensor On-Vehicle Inspection

Disconnect the sensor connector.

Measure the resistance of the sensor.

Bank 1 standard resistance:

Tester Connection	Specified Condition
1 (HA1A) - 2 (+B)	1.8 to 3.4 Ω at 20°C (68°F)
1 (HA1A) - 4 (A1A-)	10 kΩ or higher

Bank 2 standard resistance:

Tester Connection	Specified Condition
1 (HA2A) - 2 (+B)	1.8 to 3.4 Ω at 20°C (68°F)
1 (HA2A) - 4 (A2A-)	10 kΩ or higher

Connect the sensor connector.

Measure the voltage between the terminals of the ECM.

Standard voltage:

Tester Connection	Condition	Specified Condition
E16-22 (A1A+) - E17-1 (E1)	Ignition switch ON	3.3 V
E16-30 (A1A-) - E17-1 (E1)	Ignition switch ON	3.3 V
E16-23 (A2A+) - E17-1 (E1)	Ignition switch ON	3.0 V
E16-31 (A2A-) - E17-1 (E1)	Ignition switch ON	3.0 V

NOTICE:

Connect test leads from the backside of the ECM connector with the ECM connected.

HINT:

Voltage between the terminals of the ECM is kept constant regardless of the voltage of the A/F sensor.

Connect the intelligent tester to the DLC3.

Select "DATA MONITOR" - "A/FS B1 S1", "A/FS B2 S1" and "O2S B1 S2" to display the monitor.

Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.

Keep the engine speed at 2,500 rpm and confirm that the displays of "A/FS B1S1" and "A/FS B2 S1" are similar to the illustration.

HINT:

1. The illustration differs from the real display.
   
2. Only the intelligent tester displays the waveform of the A/F sensor.
   

Confirm that the display of "O2S B1 S2" changes between 0 to 1 V with the engine speed at 2,500 rpm.