Removing and installing fuel pump control unit J538 - vehicles with high-voltage system — AUDI
Removing and installing fuel pump control unit J538 - vehicles with high-voltage system on Audi: factory workshop procedure for engines CHHB, CHHP, CJSA.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
Removing and installing
fuel pump control unit
J538
- vehicles with high-voltage system
Removing
Move front seats all the way forwards.
Switch off ignition.
Remove rear shelf
General body repairs, interior
Rep. gr.
70
Passenger compartment trim panels; Removing and installing rear shelf
.
Remove luggage compartment floor
General body repairs, interior
Rep. gr.
70
Luggage compartment trim panels; Removing and installing luggage compartment floor
.
Caution
To prevent irreparable damage to the electronic components when disconnecting the battery:
Observe notes on procedure for disconnecting the battery.
Disconnect earth wire from battery terminal
Electrical system
Rep. gr.
27
Battery; Disconnecting and connecting battery
.
Fold down rear seat backrests.
Remove subwoofer
Communication
Rep. gr.
91
Sound system; Removing and installing
subwoofer
R211
.
Remove nuts
arrows 1 ... 5
and detach flange cover
6
.
Carefully release retaining hooks
2, 4
with a screwdriver.
At the same time, carefully pull fuel pump control unit
3
out of mounting.
Release retainer catch and unplug electrical connector
1
.
Installing
Note
Make sure electrical connector is attached properly; pull to check that it is correctly engaged.
Insert
fuel pump control unit
J538
into mounting and press down until it clicks into place.
Remaining installation steps are carried out in reverse sequence; note the following:
Connect battery and perform steps required after re-connecting battery
Electrical system
Rep. gr.
27
Battery; Disconnecting and connecting battery
.
Install luggage compartment floor
General body repairs, interior
Rep. gr.
70
Luggage compartment trim panels; Removing and installing luggage compartment floor
.
Install rear shelf
General body repairs, interior
Rep. gr.
70
Passenger compartment trim panels; Removing and installing rear shelf
.
Tightening torques
Chapter
“
Exploded view - fuel delivery unit/fuel gauge sender, vehicles with high-voltage system
”
Communication
Rep. gr.
91
Sound system; Overview of fitting locations - sound system
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 AUDI procedures
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- Checking engine oil pressure
- Removing and installing fuel pump control unit J538 - vehicles with high-voltage system
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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.