Perform Active Test Using Intelligent Tester Af Control

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(a) Connect an intelligent tester to the DLC3.

(b) Start the engine and turn the tester ON.

(c) Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.

(e) Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).

(f) Monitor the voltage outputs of A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2) displayed on the tester.


• The A/F CONTROL operation lowers the fuel injection volume by 12.5 % or increases the injection volume by 25 %.

• Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

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