Vehicle Speed Sensor: Testing and Inspection
Vehicle Speed Sensor (Speed Signal), Checking
Special tools and equipment
- VAG 1551/1552 Scan Tool using VAG 1551/3 adapter cable
- Fluke 83 multimeter (or equivalent)
- VW 1594 Adapter set
- Wiring diagram
Test conditions
- Speedometer OK
Test sequence
- Connect VAG 1551 (VAG 1552) Scan Tool. Refer to Scan Tool Testing/VAG 1551 Scan Tool. Testing and Inspection
- With engine idling, press buttons -0- and -1- to select "Engine electronics" address word 01
Display will appear as shown
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read measuring value block" and press -Q- button to confirm input.
Display will appear as shown
Read measuring value block HELP
Input display group number XXX
- Press buttons -0-, -0- and -5- to select "Display group number 5".
Display will appear as shown (1 to 4 = Display fields)
Read measuring value block 5 ->
1 2 3 4
- Perform road-test and observe display in Display field 3.
NOTE: You must drive the vehicle to check the vehicle speed signal. A second person is required to safely read the Scan Tool displays from a seating position other than the front passenger seal.
Display Group 98:
- Press -> button.
- Press buttons -0- and -6- to select Function 06 "End output" and press -Q- button to confirm input.
- Switch ignition off.
Continuation
If no driving speed indicated in Display field 3:
- Disconnect 3-pin harness connector from Speedometer Vehicle Speed sensor (arrow).
- Switch ignition on.
- Switch Fluke 83 multimeter to 20 Volt DC range.
- Connect multimeter between terminals 1+3 of harness connector using jumper wires from VW 1594 adapter kit.
- specification: 9 to 14.5 Volts
- Switch ignition off.
- Reconnect Vehicle Speed sensor harness connector.
If no voltage present:
- Check wiring using wiring diagram.
If voltage between 9 and 14.5 Volts:
- Connect VAG 1598118 Test Box to ECM wiring harness.
- Switch multimeter to resistance range.
- Check wiring for open circuit between central electric and Test Box socket 65 using wiring diagram:
- wire resistance: 1.5 Ohms maximum
- Connect multimeter between sockets 56 + 65 using jumper wires from VW 1594 adapter kit.
- Switch ignition on.
- Raise and rotate left front wheel or push vehicle to excite sensor.
- Voltage must fluctuate between 0 and 4 Volts minimum
If wiring OK and voltage present between terminals 1 + 3:
- Replace Speedometer Vehicle Speed sensor -G22-.
- Read-out Readiness code. Refer to Monitors, Trip and/or Drive Cycle (Readiness Codes)/Readiness Code Checking. Testing and Inspection
If DTC memory has been erased:
- Create Readiness code. Refer to Monitors, Trip and/or Drive Cycle (Readiness Codes)/Readiness Code Generating Testing and Inspection