Vehicle Speed Sensor: Testing and Inspection

Special Tools, Testers And Auxiliary Items
- VAG 1551/1552 Scan Tool With VAG 1551/3 Adapter Cable
- Multimeter (Fluke 83 Or Equivalent)
- Connector Test Kit VW 1594
- Wiring Diagram

Test Conditions
- Speedometer OK:


NOTE:: To check the speed sensor signal the vehicle must be test driven.To Do This, A Second Person Is Necessary.

Test sequence
- Engine running at idle.
- Connect VAG 1551/1552 scan tool and select "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 HELP
Input display group number XXX

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

Indicated on display (1-4 Display fields)

Read Measuring Value Block 5-->
1 2 3 4




Display Group 005: General Engine Data

- Carry out test drive and observe display in display field 3 (Second Technician Necessary).
- Press -> button.
- Press buttons -0 and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Switch ignition off.

Continuation
- If no speed is indicated:




- Disconnect 3-pin connector from vehicle speed sensor -1-.
- Switch ignition on.




- Connect multimeter using test leads from VW 1594 to measure voltage at terminals 1 and 3 of connector.
Specification: 9-14.5 volts
- Switch ignition off.
- Reconnect connector

If no voltage was present:
- Check wiring according to wiring diagram.

If voltage was 9-14.5 volts:





- Connect VAG 1598/18 test box to ECM wiring harness.
- Check wiring between central electrical panel and test box socket 65 for open circuit according to wiring diagram.
Resistance: Maximum 1.5 ohms
- Connect multimeter using test leads from VW 1594 to measure voltage at sockets 56 and 65.
- Switch ignition on.
- Lift left front wheel and rotate by hand or push vehicle.
- The voltage value must fluctuate between 0 and at least 4 volts.

If no wiring malfunction is detected and voltage is present between terminals 1 and 3:
- Replace Speedometer Vehicle Speed Sensor -G22-.
- Read the readiness code. If DTC memory has been erased, repair must be verified via appropriate display group: Readiness code, creating.