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With Manufacturer's Scan Tool



Vehicle Speed Signal, Checking

Special tools and equipment
- 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
- Battery voltage must be at least 11.5 V.
- Speedometer must be OK., checking speedometer:
- Selector lever of the automatic transmission must be in "P" or "N" position.

Test sequence

NOTE: To check the speed signal the vehicle must be driven. To do this a second person is necessary.

WARNING: Scan tool must be secured to rear seat and operated by a second technician from this position.

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

Indicated on display: (1 to 4 = Display zones)

Read measured value block 5
1 2 3 4

- Test drive vehicle with a 2nd person to observe display.

Observe the valid safety precautions when performing a road test.

- Observe figure displayed in display zone 3:
Specification: approx. driven speed

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

If no speed is displayed:







- Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.
- Connect multimeter to measure voltage between test box sockets 3 (terminal 15) + 54 (speed signal).
- Switch ignition on.
- Lift vehicle at front left.
- Rotate front wheel and observe voltage display.
Specification: between 0 and at least 4 Volt fluctuating

If the display does not fluctuate:
- Check wiring to speedometer/speedometer sensor.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory. DTC Memory, Checking and Erasing (Functions 02 and 05)
- 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
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