Connect test leads to the connectors backside The connectors should not be disconnected from the ECM


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

(b) Connect the hand-held tester to the DLC3.

(c) Select "DATA MONITOR". Then select "A/FS B1 S1", "A/FS B2 S1" and "02S B1 S2" to display the monitors.

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

(e) Keep the engine speed at 2,500 rpm and confirm that the displays of "A/FS B1 S1" and "A/FS B2 S1" are as shown in the illustration.


• The illustration may differ slightly from the display on the hand held tester.

• Only the hand-held tester displays the waveform of A/F sensor.

(f) Confirm that the display of "02S B1 S2" changes between 0 V to 1 V with the engine speed at 2,500 rpm.

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