Passat L4-1984cc 2.0L DOHC (9A) (1990)
Vehicle Speed Sensor: Testing and Inspection
For vehicles built after 10-90 starting with control unit:
49 states: 8A0 907 404
California: 893 907 404Q
NOTE: For vehicles built before 9-90, check the speedometer speed signal using Electrical Test step 21.
For vehicles with manual transmission:
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place shift lever in neutral position
For vehicles with automatic transmission:
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place selector lever in "N" position
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raise left front wheel
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connect VAG 1551 Diagnostic Tester using VAG 1551/1 adaptor wire as follows:
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first connect black connector from VAG 1551/1 to black diagnostic connector 1
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after display "VAG SELF-DIAGNOSIS" appears, connect white connector from VAG 1551/1 to brown and/or white diagnostic connector 2
If display does not appear; do not connect white connector
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check voltage supply to VAG 1551 using wiring diagram
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switch ignition ON
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press 1 button to enter "rapid data transfer"
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press 0 and 1 for address word "engine electronics"
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press Q button to enter input
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press --> button
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press 0 and 8 buttons to obtain "Read measurement block" function
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press Q button to enter input
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display will appear as shown
Read measurement block
HELP
Input display group number XX
- press 0 button twice to select display group 00
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display will appear as shown
Read measurement block
Q
Input display group number 00
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press Q to enter input
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display shows channels 1 through 10