Jetta GLS L4-1.9L DSL Turbo (ALH) (2001)
Vehicle Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Vehicle Speed Signal, Checking
Speed signal is required for air conditioner compressor cut-off when accelerating, for cruise control system and to improve driving comfort (jerk
damping).
Special tools and equipment
-
Scan Tool (ST) VAG 1551/1552 with cable VAG 1551/3
-
VAG 1598/22 test box (through my 1999)
-
VAG 1598/31 test box (from my 2000)
-
VAG 1594 adapter kit
-
VAG 1527 electrical tester
-
Wiring diagram
Test conditions
-
Battery 11.5 volts minimum.
-
Speedometer must be OK., checking speedometer:
Test sequence
NOTE: Test and measuring equipment must be secured to rear seat and operated by a 2nd person.
WARNING!
If test and measuring equipment is operated from the front seat and vehicle is involved in an accident, there is a possibility the person may be
injured when the airbag is deployed. Secure Scan Tool (ST) to rear seat.
-
Connect Scan Tool V.A.G 1551/1552, refer to "On Board Diagnostic II/VAG 1551/VAS 5051 Scan Tool, See: Testing and Inspection
-
Start engine and let idle
-
Press -0- and -1 - to select Address word 01: "Engine electronics"
Indicated on display:
Rapid data transfer
HELP
Select function XX
-
Press buttons -0- and -8- for "Read measured value block" and confirm with -Q- button.
Indicated on display:
Read measured value block
HELP
Input display group number XXX
-
Press buttons -0-, -0- and -6- for "Display group number 6" and confirm with -Q- button.
-
Test drive with 2nd person to observe display.
Observe safety precautions when driving road test See: Service Precautions/Technician Safety Information
-
Observe figure in display field 1.
Read measured value block 6
->
XXX km/h
0 0 0
000000
255
Specification: approx. road speed
-
Press -> button.
-
Press buttons -0- and -6- for "End output" and confirm with -Q- button.
-
Switch off ignition.
If no speed is indicated:
-
Remove wiper arms and cowl panel