Power Steering Pressure Switch Signal, Checking

Signal from power steering pressure switch, checking

Special tools and equipment 1
- V.A.G1551 scan tool or V.A.G1552 mobile scan tool with V.A.G1551/3B cable
- V.A.G1598/31 test box
- V.A.G1526 or Fluke 83 multimeter
- V.A.G1594 adapter set
- Wiring diagram

Check conditions







- All fuses must be OK.
- Battery voltage must be at least 11.5 V.

Test sequence
- Connect V.A.G1551 scan tool (V.A.G1552). Start engine and select "Address word" 01 of engine control module. Engine must be running at idling speed. (Connecting scan tool and selecting engine control module. [1][2][3]Connecting VAG 1551 Scan Tool)

Indicated on display

Rapid data transfer HELP
Select function XX

- Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display

Read measured value block HELP
Input display group number XXX

- Press keys 0, 5 and 6 for "Display group number 56" and confirm entry with Q key.

Indicated on display

Read measured value block 56
1 2 3 4

- Observe values for power 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 -> key.
- Press keys 0 and 6 for "End output" function and confirm input with Q key.
- Switch ignition off.

If the specification is not obtained:
- Connect multimeter to pressure switch contacts.
- Start engine and run at idling speed.
- Check pressure switch for continuity.
Specification: Infinite Ohms
- Turn steering wheel to full lock.
Pressure switch must switch to continuity.

If the specifications are not attained:
- Replace pressure switch for power steering:
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory.
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes

If the specifications are attained:
- Check wiring.

Checking wiring connections







- Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.







- Disconnect black 2-pin harness connector to pressure switch for power steering (arrow).







- Check wiring between test box and 2-pin connector for open circuit using wiring diagram.
Contact 1 + socket 49
Contact 2 + socket 50
Wire resistance: Max. 1.5 Ohms
- Check wires for short to one another.
- Check wiring for short to battery positive or Ground (GND).

If no wiring malfunction is detected:
- Replace engine control module.