With Manufacturer's Scan Tool

Vehicle Speed Signal, Checking

Special tools and equipment
- V.A.G1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
- VAG1598/22 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 adapter set
- Wiring diagram

Test requirements
- Battery (B+) voltage at least 11.5 V
- Speedometer OK

Test sequence

NOTE: You must drive the vehicle in order to check the speed signal. This requires a second person.

WARNING! Secure scan tool to rear seat and operate from this position.

- Connect V.A.G1551 (VAG1552) Scan Tool (ST). [1][2]Reading and Clearing Diagnostic Trouble Codes
- Turn on ignition and press buttons -0- and -1- to insert "Engine Electronics" address word 01.

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.

Indicated on display

Read Measuring Value Block
Input display group number XXX

- Press buttons -0-, -0- and -5- to input display group number 5 (005) and press -Q- button to confirm input.

Indicated on display: (1-4 = display fields)

Read Measuring Value Block 5 ->
1 2 3 4

- Carry out test drive with 2nd person to observe display.
Observe safety precautions when performing road test. Technician Safety Information
- Observe figure displayed in display field 3:
Specified value: approx. driven speed

Display Group 5:

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

Continuation

If no speed is displayed:
- Remove wiper arms and plenum chamber cover.






- Connect VAG1598/22 test box to control module wiring harness connector.
- Connect multimeter to measure voltage between test box sockets 2 + 20.
- Turn on ignition.
- Lift vehicle at left-front.
- Rotate front wheel and observe voltage display.
Specified value: between 0 and at least 4 Volts fluctuating

NOTE: If necessary, hold the right-front wheel to prevent the wheel from turning.

If the display does not fluctuate:
- Check wiring from Engine Control Module (ECM) harness connector terminal 20 to instrument cluster for open/short circuit.
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
Reading Diagnostic Trouble Codes
Clearing Diagnostic Trouble Codes

- Display readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, generate the readiness code again. Monitors, Trips, Drive Cycles and Readiness Codes