Checking system pressure and holding pressure: Audi 1.6 (ABB)
Step-by-step checking system pressure and holding pressure for the Audi 1.6 (ABB): factory workshop text.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
Test requirements:
Battery voltage at least 12.7 V
Fuse S17 OK (in fuse box)
Fuel pump relay OK; checking => Page
25-6
Fuel pump OK; checking
=> Repair Group 20
K-Jetronic/TCI-H ignition system
Fuel filter OK
Pressure gauge V.A.G 1318 connected with test adapter 1318/4
=> Page
25-58
Attention:
Fuel system is pressurised. Wrap cloth around joint before opening system. Then dissipate pressure by carefully unfastening joint.
Checking and adjusting system pressure
Close cut-off valve of pressure gauge V.A.G 1318 -position B-.
Start engine and let it idle.
Specification: 5.2 ... 5.9 bar
If reading does not match specification:
Adjust system pressure by fitting or taking out shims -1-.
To increase system pressure: Use thicker or several shims
To reduce system pressure: Use thinner or fewer shims
Change in pressure per 0.5 mm shim thickness: approx. 0.3 bar
Note:
To dissipate pressure, detach control pressure pipe at warm-up regulator (large connection).
Attention:
Fuel system is pressurised. Wrap cloth around joint before opening system. Then dissipate pressure by carefully unfastening joint.
Unfastening fuel supply pipe causes pressure container to be drained - approx. 10 cm of fuel squirts out.
Repeat test.
If reading still does not match specification:
A - System pressure too low
Fuel pipe kinked, clogged or leaking
Fuel accumulator leaking
Fuel filter clogged
Inadequate fuel pump delivery
=> Repair Group 20
K-Jetronic/TCI-H ignition system
System pressure regulator/pressure relief valve defective or dirty
Fuel distributor defective
B - System pressure too high
Fuel return pipe kinked or clogged
System pressure regulator/pressure relief valve defective
Checking holding pressure
Test requirements:
Coolant temperature at least 80 °C
System pressure OK
Start engine and let it idle.
Open cut-off valve of pressure gauge V.A.G 1318 -position A-.
Switch off engine after reaching specified value.
Specification: 3.4 ... 3.8 bar
Check holding pressure on gauge.
After 10 minutes pressure must still be at least 3.3 bar
If holding pressure drops below 3.3 bar:
Non-return valve in fuel pump defective:
=> Repair Group 20
K-Jetronic/TCI-H ignition system
Fuel pipes to fuel distributor leaking
System pressure regulator/pressure relief valve leaking
Cold start valve and injectors leaking
Fuel distributor and pipe connections leaking
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.
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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.