With Manufacturer's Scan Tool

Intake System, Checking For Leaks (Unmetered Air)

Special tools and equipment







- VAS5051 with VAG5051/1
- Engine leak detection spray G 001 800 A1

NOTE:
- Negative pressure in the intake system sucks in the leak detection spray with unmetered air. Leak detection spray decreases ignition quality and performance of fuel mixture. This causes a reduction in engine speed and a sharp increase of CO content.
- It is absolutely necessary to follow safety precautions listed on can.

Test sequence
- Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Engine must run at idle for this. Connecting VAS 5051/VAG 1551 Scan Tool (ST)

Display on VAS 5051:







- Select "Read Measuring Value Block."

Display on VAS 5051:







1 Enter display group, max. entered value = 255
- In display field -2- enter "001" for "display group number 001" and press -Q- button to confirm input.

Display on VAS 5051:







- Make note of engine speed in display field 1.
- Spray intake system parts with engine leak detection spray in a systematic manner.

If engine speed decreases:
- Check sprayed area of intake system for leaks and repair.
- Exit function "08 - Read Measuring Value Block" by pressing <- button.

Display on VAS 5051:







- Under -1- select diagnostic function "06 - End output".
- Switch ignition off.