Volkswagen Golf Service & Repair Manual: Checking function and voltage supply of the fuel pump, engine code CWVA

Volkswagen Golf Service & Repair Manual / Fuel supply system - Petrol engines / Fuel supply, gas operation / Fuel pump / Checking function and voltage supply of the fuel pump, engine code CWVA

Special tools and workshop equipment required

Removal wedge -3409-

Checking function and voltage supply of the fuel pump, engine code CWVA

Multimeter e.g. hand-held multimeter -V.A.G 1526E-

Checking function and voltage supply of the fuel pump, engine code CWVA

Auxiliary measuring set -V.A.G 1594C-

Vehicle diagnostic tester

Test prerequisites

Battery voltage must be at least 11.5 V. If necessary, charge battery → Electrical system; Rep. gr.27.

Fuses OK. → Current flow diagrams, Electrical fault finding and Fitting locations

Test sequence:

Note

Function of fuel pump is checked using final control diagnosis.

–	Observe safety precautions → Chapter.

–	Observe rules for cleanliness → Chapter.

Checking function and voltage supply of the fuel pump, engine code CWVA

–	Connect vehicle diagnostic tester-1- as follows:

–	Connect diagnosis cable connector -2- to diagnostic connection in driver footwell.

–	Switch ignition on.

–	Select final control diagnosis for fuel pump in vehicle self-diagnosis program.

The fuel pump must now run slowly up to maximum speed.

Note

The fuel pump runs very quietly.

If the final control diagnosis is to be carried out several times in succession, it may be necessary to start the engine briefly before repeating the final control diagnosis.

–	Switch off ignition.

If fuel pump does not run:

Golf SV:

–	Remove right rear seat → General body repairs, interior; Rep. gr.72.

Checking function and voltage supply of the fuel pump, engine code CWVA

–	Partially detach cover -1- in floor covering at parting line -arrow-.

–	Do not detach cover completely from floor covering in order to ensure it is reinstalled in the correct installation position.

–	Detach it just enough that the cover can be folded upwards.

–	Fold up cover in -direction of arrow-.

Golf and Golf Estate:

–	Remove rear bench seat → General body repairs, interior; Rep. gr.72.

Checking function and voltage supply of the fuel pump, engine code CWVA

Continuation for all vehicles:

–	Unclip cover -1- for flange on right at retaining tabs -arrows-, using removal wedge -3409-.

Checking function and voltage supply of the fuel pump, engine code CWVA

–	Unclip sealing grommet -1- downwards from cover -2-.

–	Push cover -2- back along wiring harness -3-.

Checking function and voltage supply of the fuel pump, engine code CWVA

–	Check that connector -arrow- is fitted securely by pulling connector without pressing catch.

–	If connector was not inserted correctly, repeat final control diagnosis of fuel pump.

–	Release and pull off connector -arrow-.

–	Check contacts on plug and on fuel delivery unit for damage.

Checking function and voltage supply of the fuel pump, engine code CWVA

–	Connect test instrument/DSO adapter (5-pin) -VAS 5565- to connector and fuel delivery unit.

–	Connect multimeter to cables -1- and -5- of test instrument adapter/DSO (5-pin) -VAS 5565-.

–	Switch ignition on.

Specification: approx. battery voltage

If the specification is not attained:

–	Locate and eliminate open circuit referring to current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.

Checking function and voltage supply of the fuel pump, engine code CWVA

If no fault is detected:

The fuel system is pressurised.Risk of injury due to fuel which may spurt out.Wear eye protection.Wear protective gloves.Release pressure: place clean cloth around connection and carefully open connection.

–	Draining fuel tank → Chapter

–	Pull fuel line -1- off flange. Separate plug-in connectors → Chapter.

Vehicles with auxiliary heater:

–	Remove fuel line -2- leading to metering pump -V54- for auxiliary heater from sealing flange.

–	To do this, open clip at bottom.

–	Carefully pull out fuel line -2-.

Checking function and voltage supply of the fuel pump, engine code CWVA

Continuation for all vehicles:

–	Open locking ring using wrench -T10202-.

–	Check that electrical wires between flange and fuel pump are connected.

–	Check contacts for damage.

If no open circuit can be found:

–	Fuel pump is defective, renew fuel delivery unit → Chapter.

Checking function and voltage supply of the fuel pump, engine code CWVA

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