Solely on these reference values when deciding whether a part is faulty or not

1. Warm up the engine.

2. Turn the ignition switch off.

3. Connect the intelligent tester to the DLC3.

4. Turn the ignition switch to the ON position.

5. Turn the intelligent tester on.

6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST.

7. Follow the instructions on the tester and read the DATA LIST.


Measurement Item/ Range (Display)

Normal Condition

Diagnostic Note


Stop light switch status/ ON or OFF

• Brake pedal is depressed: ON

• Brake pedal is released: OFF


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.

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