Testing signal from power steering pressure switch: Audi 1.6 (AEH, AKL)
Step-by-step testing signal from power steering pressure switch for the Audi 1.6 (AEH/AKL): factory workshop text.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📋 Procedure
AKL
Note:
The signal from the power steering pressure switch (F88) is used to stabilise the idling speed of the engine when the steering wheel is turned to full lock (left or right).
Connect the fault reader V.A.G 1551 (V.A.G 1552). Start the engine and select the engine control unit with "Address word" 01.
(Connecting fault reader and selecting engine control unit => Page
01-4
.)
Rapid data transfer
HELP
Select function XX
Display readout:
Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
Read measured value block
HELP
Enter display group number XXX
Display readout:
Press keys 0,1 and 9 for "Display Group 19" and confirm entry by pressing Q.
Read measured value block 19
⇒
1
2
3
4
Display readout:
Observe figure displayed in display zone 4:
Specification: x x x x x x 0 x
Turn the steering wheel to full lock and observe the display in display zone 4 (2nd position from right) .
Specification: x x x x x x 1 x
Press the ⇒-key.
Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
Switch off ignition.
If the specification is not attained:
Connect test box V.A.G 1598/22 to wiring harness for control unit.
Check wiring between test box and 2-pin connector for open circuit using current flow diagram.
Contact 1+socket 24
Contact 2+socket 14
Wire resistance: max. 1.5 ω.
Additionally check all wires for short to one another.
Specification: infinite resistance.
If no wiring fault is detected:
Connect multimeter V.A.G 1526 (resistance measurement range) to the contacts of the pressure switch:
Start the engine and run at idling speed.
The multimeter should display infinite resistance (pressure switch is open).
Turn steering wheel to full lock.
The pressure switch must switch to continuity.
The multimeter should display a resistance value of less than 1.5 ohm.
If the specifications are not attained:
Renew power steering pressure switch:
=> Running gear, Axles, Steering; Repair Group 48; Vane pump, Reservoir, Hydraulic pipes
Running gear, Axles, Steering
Vane pump, Reservoir, Hydraulic pipes
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.