Checking Motronic current supply relay -J271 — AUDI
Checking Motronic current supply relay -J271 on Audi: factory workshop procedure for engines APG, BCY, BRV. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 42 workshop diagrams for APG
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
BRV
Relay fitting locations
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Note:
Motronic current supply relay -J271 powers ignition coils with output stages and engine control unit at pin 3 as well as certain other components. With ignition on, -12 V- must be applied to contact 1 of the relevant ignition coil connector.
Checking actuation wire between current supply relay and engine control unit
Switch off ignition.
Disconnect current supply relay -J271 from 3-position relay carrier.
Connect up test box V.A.G 1598/31 at wiring harness to engine control unit. Actual engine control unit is not to be connected=>Page
24-34
.
Check for open circuit/short circuit in following wiring.
Test box V.A.G 1598/31, socket · Current supply relay, contact
23 · 4 / => Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Resistance: max. 1.5 ohms
Eliminate open circuit in wiring/short circuit if necessary.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If no fault is found in wiring:
Check power supply for current supply relay => Page
28-14
.
Checking power supply
Switch off ignition.
Connect up portable multimeter for voltage measurement to contact 1 of relay socket and earth.
Connect up portable multimeter for voltage measurement to contact 2 of relay socket and earth.
Specification: approx. battery voltage in each case
If reading does not match specification, use current flow diagram to check power supply.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If reading matches specification, check wiring between current supply relay and engine control unit => Page
28-15
.
Checking wiring between current supply relay and engine control unit
Check fuse (see current flow diagram).
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If no fault is found in fuse:
Check for open circuit/short circuit in following wiring.
Test box V.A.G 1598/31, socket · Current supply relay, relay socket contact
3 · 8 / => Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
Resistance: max. 1.5 ohms
Eliminate open circuit in wiring/short circuit if necessary.
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder
If none of the checks reveals a fault, replace Motronic current supply relay -J271.
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.