Standard Voltage

(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) On the tester, 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) displayed on the tester.

HINT:

• 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.

Tester Display (Sensor)

Injection Volumes

Status

Voltages

AFS B1S1 (A/F)

+25 %

Rich

Less than 3.0

AFS B1S1 (A/F)

-12.5 %

Lean

More than 3.35

O2S B1S2 (HO2)

+25 %

Rich

More than 0.5

OS2 B1S2 (HO2)

-12.5 %

Lean

Less than 0.4

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment