Engine Speed Signal, Checking

Engine Speed Signal, Checking

Special tools and equipment
- VAG 1551 scan tool or 1552 scan tool with cable VAG 1551/3

Check conditions
- Speedometer must be OK., checking speedometer:

Test sequence

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

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

- Connect V.A.G 1551 scan tool ((VAG 1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must be running at idling speed. [1][2]Reading and Clearing Diagnostic Trouble Codes

Indicated on display:

Rapid data transfer HELP
Select function XX

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

Indicated on display:

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

If no speed is displayed:
- Check wiring to speedometer/speedometer sender.

- Check DTC memory, if necessary, repair any faults and then erase DTC memory, checking and erasing DTC memory.
Reading Diagnostic Trouble Codes
Clearing Diagnostic Trouble Codes

- Check drive train data bus.