Checking power steering pressure switch -F88: Audi 1.8 (AMK, BAM)
Step-by-step checking power steering pressure switch -F88 for the Audi 1.8 (AMK/BAM): factory workshop text.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 44 workshop diagrams for AMK
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
BAM
The function of the power steering pressure switch is to stabilise the idling speed when the steering wheel is on full lock (left or right).
Test sequence
Connect vehicle diagnostic, testing and information system VAS 5051 => Page
01-3
and select vehicle system "01 -Engine electronics" in the selection. For this purpose, the engine must be running at idling speed.
Display on VAS 5051:
Under -1- select the diagnostic function "08 - Read measured value block".
Display on VAS 5051:
1 -
Enter display group
max. input value = 255
Enter "056" for "display group number 056" in zone -2- and confirm the entry by pressing the Q key.
Display on VAS 5051:
Check the power steering pressure switch in display zone-4-.
Display zones
1 · 2 · 3 · 4
Display group 056: Idling stabilisation when idling at operating temperature
Display · xxx rpm · xxx rpm · x.x % · X X X X X
Display · Engine speed (actual) · Engine speed (specified) · Idling speed control / Change in torque · Operating conditions
Range · / · 0XXXX / 1XXXX
Specified value · ▪ Steering in straight-ahead position or slightly off-centre: / 0XXXX
▪ Full steering lock or fast steering movement: / 1XXXX
Note: · Value: / X = no meaning
If the display is not as described:
Check switch
Unplug the connector for power steering pressure switch -F88 at the power steering pump.
Connect multimeter to switch to measure resistance.
Start the engine.
Specified value: ∞ω (no continuity)
Turn the steering wheel to full lock position to right/left.
Specified value: approx. 0 ω
If the display does not change:
Replace the power steering pressure switch -F88.
If the display changes:
Check the wiring connections
=>Page
24-209
.
Checking wiring
Connect test box V.A.G 1598/31 to wiring harness for engine control unit; do not connect the engine control unit => Page
24-19
.
Check for open circuit and short to positive or earth in the following wiring connections:
Connector / Contact · Test box V.A.G 1598/31 / Socket
1 · 49
2 · 50
Rectify any open/short circuit as necessary.
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.