Jetta GL Wagon L4-1.9L DSL Turbo (ALH) (2002)
Vehicle Speed Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Speed Signal, Testing
Special tools and equipment
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Scan Tool VAG 1551 or vehicle system tester
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VAG 1552 with cable VAG 1551/3
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Test box VAG 1598/31
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Adapter set VAG 1594
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Diode test lamp VAG 1527
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Wiring diagram
Check conditions
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Speedometer must be OK., checking speedometer:
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The battery voltage must be at least 11.5 V.
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.
Test sequence
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Connect Scan Tool VAG 1551 (VAG 1552) and select engine electronics control unit with the "Address word" 01. When doing this the engine
must be running at idling speed. (Connecting Scan Tool and selecting engine electronics control unit. See: Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool)
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- for "Read measured value block" and confirm entry with -Q- button.
Indicated on display:
Read measured value block
Enter display group number XXX
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Press buttons -0-, -0- and -6- for "Display group number 6" and confirm entry with -Q- button.
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Perform road test with a 2nd person to observe display.
Observe the valid safety precautions when carrying out a road test.
Read measured value block 6
->
xxxkm/h
0 0 0
000000
255
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Observe figure in display field 1.
Specification: approx. road speed
If no speed is indicated:
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Press -> button.
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Press buttons -0- and -6- for "End output" and confirm with the -Q- button.
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Switch off ignition.
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Remove wiper arms and plenum cover.