Volkswagen Golf Variant / Jetta. Manual - part 429

Control Line to Turbocharger, Checking

Special tools and workshop equipment required
♦ Hand Vacuum Pump - VAS6213-

Caution

♦ When routing the vacuum lines, make sure they are not

kinked, twisted or pinched. They could disable the vehicle.

♦ Follow the safety precautions when working on the charge

air system and turbocharger. Refer to

⇒ “1 Safety Precautions when Working on Charge Air

System And Turbocharger”, page 268

 .

♦ Pay attention to the guidelines for clean working condi‐

tions. Refer to

⇒ “2 Guidelines for Clean Working Conditions”,

page 269

 .

Always pay attention to these instructions before and during

work.

– Remove the vacuum hose at the center connection of the

Wastegate Bypass Regulator Valve - N75- -item 2-

⇒ Item 2 (page 296)

 as well as at the turbocharger vacuum

diaphragm -item 1- 

⇒ Item 1 (page 296)

 .

– Seal an open end of the hose with a suitable blind plug.

Note

Do not use threaded bolts or pins.

– Connect the Hand Vacuum Pump - VAS6213- to the other end

of the hose and generate a vacuum of 0.6 bar (8.7 psi).

– Watch the pressure gauge on the Hand Vacuum Pump -

VAS6213- for approximately 30 seconds.

• The vacuum must not drop.
If vacuum drops:
– Replace the vacuum hose.
– Connect all the vacuum hoses.
– Install the engine cover. Refer to

⇒ “1.4 Engine Cover, Removing and Installing”, page 90

 .

If the vacuum does not decrease:
– Connect all the vacuum hoses.
– Install the engine cover. Refer to

⇒ “1.4 Engine Cover, Removing and Installing”, page 90

 .

4. Charge Air System    

299

Control Line to EGR Cooler Switch-Over

Vacuum Diaphragm, Checking, Engine

Codes CBDA, CBDB, CEGA

– Remove the hose at the center connection of the EGR Cooler

Switch-Over Valve - N345- -arrow-.

– Connect the Hand Vacuum Pump - VAS6213- to the removed

hose and generate a vacuum pressure of 0.6 bar (8.7 psi).

– Watch the pressure gauge on the hand vacuum pump for ap‐

proximately 30 seconds. The vacuum must not drop.

If the pressure drops:
– Remove the vacuum hose on the vacuum diaphragm for the

EGR cooler switch-over.

– Connect the Hand Vacuum Pump - VAS6213- with the sup‐

plied test hose to the vacuum diaphragm and create a pres‐

sure of 0.6 bar (8.7 psi).

Note

♦

The adjusting travel of the vacuum diaphragm must be recog‐

nizable and the vacuum must not drop. If it is not, replace the

EGR cooler. Refer to

⇒ “4.1 Overview - Exhaust Gas Recirculation System Com‐

ponents”, page 403

 .

♦

If a fault is not identified at the vacuum diaphragm, replace the

vacuum line on the EGR Cooler Switch-Over Valve - N345- .

♦

Install the engine cover. Refer to

⇒ “1.4 Engine Cover, Removing and Installing”, page 90

 .

300

Special Tools

Special tools and workshop equipment required
♦ Torque Wrench 1331 5-50Nm - VAG1331-

♦ Turbo System Tester Kit - VAG1687-

♦ Hand Vacuum Pump - VAS6213-

♦ Hose Clip Pliers - VAS6362- or the Hose Clip Pliers -

VAS6340-

♦ Not Illustrated:
♦ Wrench - Open End - 14mm - T10461-

5. Special Tools    

301

302