SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4-Cyl. Injection Engine (2 valves, roller rocket finger), Mechanics | Mixture preparation system, electronic inj.,Gas | Checking additional signals | Checking signal from power steering pressure switch

Checking signal from power steering pressure switch

Special tools and workshop equipment required

t	Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3-

t	Test box -V.A.G 1598/22-

t	Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715-

t	Adapter set -V.A.G 1594-

t	Current flow diagram

Test sequence

–	Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and select “Address word” 01 of engine control unit. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)

Indicated on display:

–	Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.

Rapid data transfer                 HELP

Select function XX

Indicated on display:

–	Press keys 0, 5 and 5 for “Display group number 55” and confirm entry with Q key.

Read measured value block           HELP

Input display group number XXX

Indicated on display:

–	Observe values for the power assisted steering pressure switch displayed in display zone 4. Specification: 0 x x x x

–	Turn steering wheel to full lock and observe value displayed in display zone 4 (1st digit from left) Specification: 1 x x x x

–	Press the → key.

–	Press keys 0 and 6 for the “End output” function and confirm input with the Q key.

–	Switch off ignition.

If the specification is not obtained:

–	Connect multimeter -V.A.G 1526- to pressure switch contacts.

–	Start the engine and run at idling speed. Check pressure switch for continuity. Specification: ∞ Ω

–	Turn steering wheel to full lock. The pressure switch must switch to continuity.

If the specifications are not attained:

–	Renew pressure switch for power assisted steering:

If the specifications are attained:

–	Check the wiring → Anchor.

–	Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92

Read measured value block 55           →

–	Connect test box -V.A.G 1598/22- to control unit wiring harness.

–	Check wiring between test box and 2-pin connector for open circuit using current flow diagram. Contact 1+socket 49 Contact 2+socket 21 Wire resistance: Max. 1.5 Ω

–	Additionally check wires for short to one another.

–	Additionally check the wiring for short to battery positive or earth.

If no fault is detected in the pipes:

–	Renew engine control unit → Chapter.

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