Schematic diagram - vacuum system, “single turbo engine” — VW
Schematic diagram - vacuum system, “single turbo engine” on VW: factory workshop procedure for engines CAAA, CAAB, CAAC, CAAD.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📐 31 workshop diagrams for CAAA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Schematic diagram - vacuum system,
“single turbo engine”
Caution
Do not kink, twist or crush the vacuum lines when routing. This may cause breakdowns.
Push all hoses on to stop or at least 10 mm onto the respective connection.
Vacuum switch for rear differential lock
F363
Installed in vehicles with four-wheel drive only.
Further information on the function
Self-study programme
No.
333
.
Removing and installing
Rep. gr.
39
Final drive; Assembly overview - final drive
Checking
Chapter
Non-return valve
For
differential lock valve 2
N126
.
Installed in vehicles with four-wheel drive only.
Note installation position
Checking
Chapter
Non-return valve
For
differential lock valve 1
N125
.
Installed in vehicles with four-wheel drive only.
Note installation position
Checking
Chapter
Charge pressure control solenoid valve
N75
With individual air filter.
Checking
Chapter
6 Nm
Differential lock valve 2
N126
Installed in vehicles with four-wheel drive only.
Switches differential lock on.
Further information on the function
Self-study programme
No.
333
.
Checking
Chapter
Differential lock valve 1
N125
Installed in vehicles with four-wheel drive only.
Switches differential lock off.
Further information on the function
Self-study programme
No.
333
.
Checking
Chapter
Non-return valve
For
charge pressure control solenoid valve
N75
and vacuum reservoir in cylinder head cover.
Note installation position
Checking
Chapter
Connecting piece
Installed in brake servo
Removing and installing
Rep. gr.
47
Brake servo/brake master cylinder; Assembly overview - brake servo/brake master cylinder
Exhaust gas recirculation cooler changeover valve
N345
Checking
Chapter
Non-return valve
Installed in vehicles with four-wheel drive only.
For vacuum system to rear final drive.
Note installation position
Checking
Chapter
Removing and installing
Chapter
Vacuum unit
For changeover for exhaust gas recirculation cooler.
Vacuum unit is installed on exhaust gas recirculation cooler. Both parts can only be renewed together.
Checking
Chapter
Position sender for charge pressure positioner
G581
With vacuum unit with potentiometer
On turbocharger.
Not available as separate part.
Checking
Chapter
Removing and installing
Chapter
Cylinder head cover
Vacuum reservoir is installed in cylinder head cover. Both parts can only be renewed together.
Checking
Chapter
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
Ask about my car →Other VW procedures
- Renewing crankshaft oil seal - belt pulley end
- Removing and installing exhaust gas recirculation cooler, "“single turbo engine”"
- Removing and installing tandem pump, engine codes AXD, AXE, BLJ, BNZ, BPC
- Checking fuel delivery rate of fuel system pressurisation pump G6 - vehicles without supplementary fuel pump V393
- Removing and installing fuel pressure sender G247 – Audi A3
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.