Checking secondary air pump relay -J299 — AUDI
Checking secondary air pump relay -J299 on Audi: factory workshop procedure for engines AKC, ANK, APG, AQF. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 20 workshop diagrams for AKC
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
Fitting location of secondary air pump relay is relay position 1.
Fitting location of secondary air pump motor -V101 is at right longitudinal member.
Start final control diagnosis and actuate secondary air pump relay
-J299 => Page
01-46
.
Secondary air pump relay must be energised and secondary air pump motor -V101 must run intermittently
A - If relay does not pick up:
Check power supply of secondary air pump relay => Page
24-146
.
Check actuation of secondary air pump relay => Page
24-148
.
B - If relay is energised but secondary air pump motor does not run:
Check power supply for secondary air pump motor => Page
24-149
.
Checking power supply of secondary air pump relay
Disconnect secondary air pump relay -1-.
Connect up portable multimeter for voltage measurement as follows.
Relay carrier, position 1, / contact · Measure to /
1 · Engine earth
Specification: approx. battery voltage
If reading does not match specification:
Perform the following checks marked with a dot.
Fuses must be OK.
Check for open circuit in wiring from battery + (terminal 30) to fuse of secondary air pump relay -J299.
=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder
Connect up portable multimeter for voltage measurement as follows.
Relay carrier, position 1, / contact · Measure to /
3 · Engine earth
Briefly operate starter.
Specification: approx. battery voltage
If reading does not match specification:
Perform the following checks marked with a dot.
Check for open circuit in wiring from secondary air pump relay -J299 via fuse to fuel pump relay.
=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder
Checking actuation of secondary air pump relay
Switch off ignition.
Disconnect secondary air pump relay -1-.
Connect up voltage tester V.A.G 1527 B as follows.
Relay carrier, position 1, / contact · Measure to /
4 · Battery (positive)
Start final control diagnosis and actuate secondary air pump relay
-J299 => Page
01-46
.
LED must flash
If LED does not flash:
Switch off ignition.
Connect test box V.A.G 1598/31 to engine control unit wiring harness. Actual engine control unit is not to be connected=>Page
24-12
.
Check for open circuit and short to earth/positive in the following wiring:
Relay carrier, position 1, / / contact · Test box V.A.G 1598/31, / socket
4 · 9
If necessary, eliminate open circuit in wiring/short circuit.
If no fault is found:
Replace secondary air pump relay -J299.
Checking power supply for secondary air pump motor
Unplug connector from secondary air pump motor -V101.
Connect up voltage tester V.A.G 1527 B between contacts 1 and 2.
Start final control diagnosis and actuate secondary air pump relay
-J299 => Page
01-46
.
LED must light
If LED does not light:
Perform the following checks marked with a dot.
Check for open circuit in wiring from connector at motor -V101 to secondary air pump relay -J299.
=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder
Check for open circuit in wiring from connector at motor -V101 to earth connection 1 in engine compartment wiring harness.
=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder
If no fault is found:
Replace secondary air pump motor -V101.
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.