Speedometer Vehicle Speed Sensor (VSS) -G22-, Checking

Speedometer vehicle speed sensor (VSS) -G22-, checking

Special tools and equipment
- V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
- VAG 1598/31 test box
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test requirements

- Battery voltage must be at least 11.5 volts.
- Speedometer must be working properly. Testing speedometer:

Test sequence

NOTE: To test speed signal, vehicle must be driven. Doing this requires a second person.

WARNING!
The scan tool must be secured to the rear seat and operated by a second technician from there.

- Connect VAG 1551 scan tool (VAG 1552). Start engine and select Engine Control Module (ECM) using address word 01. Refer to Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting V.A.G 1551 Scan Tool [1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.

Indicated on display

Read Measuring Value Block HELP
Input display group number XX

- Press 0, 0 and 5 for function "display group number 5", and then press Q to exit from input mode.

Indicated on display (1 - 4 = display fields)

Read Measuring Value Block 5 ->
1 2 3 4

- Perform a road test, and have 2nd person observe indication on display.
- Read value indicated in display field 3.
Specification: approx. vehicle speed

- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
- Switch ignition off.

If no speed is indicated:






- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- To measure voltage, connect multimeter between sockets 3 (terminal 15) + 54 (speed signal) of test box.
- Switch ignition on.
- Jack up front left wheel.
- Rotate front wheel, and observe voltage indicated while doing so.
Specification: between 0 and at least 4 volts, oscillating

If indicated voltage does not oscillate:
- Check wires going to speedometer and speed sensor.