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

HINT:

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.

HINT:

• 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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