Vehicle Speed Sensor: Testing and Inspection

Vehicle Speed Signal Check

Special tools and equipment
- VAG1551 scan tool or VAG1552 mobile scan tool with VAG1551/3B cable
- VAG1598/31 test box
- VAG1526 hand multimeter or VAG1715 multimeter
- VAG1594 adapter set
- Wiring diagram

Check conditions
- The battery voltage must be at least 11.5 V.
- Speedometer must be OK., checking speedometer.
- The 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 VAG1551 scan tool (VAG1552). 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). Refer to "VAG1551 Scan Tool Tools and Equipment

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


- Carry out test drive with a 2nd person to observe display.
- 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 VAG1598/31 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 sender.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, Checking and Erasing DTC Memory. Refer to "Displaying and Reading Trouble Codes/With Manufacture Scan Tool/Check DTC Memory (Function 02)" Testing and Inspection
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again: Refer to "Monitors, Trips and/or Drive Cycle/ Reading Readiness Code" Testing and Inspection
Engine code AWW, Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" Testing and Inspection
Engine code AWP, Refer to "Monitors, Trips and/or Drive Cycle/Generating Readiness Code" Testing and Inspection