Checking function and voltage supply, vehicles with engine codes CJKA, CJKB — VW
Checking function and voltage supply, vehicles with engine codes CJKA, CJKB on VW: factory workshop procedure for engines AXA, BDL, BKK, CJKA.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📐 19 workshop diagrams for AXA
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Checking function and voltage supply, vehicles with engine codes CJKA, CJKB
Battery voltage at least 11.5 V, if necessary connect a battery charger.
Fuse for fuel pump on fuse holder OK
Current flow diagrams, Electrical fault finding and Fitting locations
.
Fuel pump control unit
J538
OK.
Test sequence:
Note
Function of fuel pump is checked using final control diagnosis.
Connect
Vehicle diagnostic tester
as follows:
Connect diagnosis cable connector to diagnostic connection in driver footwell.
Switch ignition on.
Press one after the other in the display the buttons for
Vehicle self-diagnosis
,
Engine electronics
and
Final control diagnosis
.
Press right arrow button
►
on display to final control diagnosis for fuel pump electronics.
The fuel pump must now run slowly up to maximum speed.
Note
The fuel pump runs very quietly.
Switch off ignition.
If fuel pump does not run:
Lower fuel tank until connectors on fuel delivery unit are accessible.
First ensure that wiring connection
1
is secure by pulling the connector without pressing the catch. If connector was not inserted correctly, repeat functional check of fuel pump.
Pull off connector
1
.
Check contacts on connector and on fuel delivery unit for damage.
Check voltage supply against current flow diagram with
multimeter
V.A.G 1715
.
Specification: approx. battery voltage.
WARNING
The fuel line is under pressure.
Risk of injury to eyes and skin from fuel.
Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point.
Voltage supply not OK:
Locate and eliminate open circuit referring to current flow diagram
Current flow diagrams, Electrical fault finding and Fitting locations
.
Voltage supply OK:
Remove fuel delivery unit
Chapter
.
Check that electrical wires between flange and fuel pump are connected.
If no open circuit can be found:
Fuel pump is defective, renew fuel delivery unit
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.
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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.