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Home >> Volkswagen >> 1997 >> Passat TDI, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 1.9L >> Self-Diagnostic System >> Retrieving DTCS >> Using VAG 1551 Scan Tool
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Using VAG 1551 Scan Tool

  1. Data Link Connector (DLC) is located below tachometer. See Fig 1 . Remove DLC cover. Ensure ignition is off. Connect scan tool to DLC. Scan tool should alternately display 1-RAPID DATA TRANSFER and 2-BLINK CODE OUTPUT.
    Fig 1: Locating Data Link Connector (Passat)
    G50D16967Courtesy of VOLKSWAGEN UNITED STATES, INC.
  2. Turn ignition on. Operate scan tool and observe display. Press "1" button to select RAPID DATA TRANSFER function. Press PRINT button to turn on printer. Indicator light on button should come on.
  3. Press "0" and "1" buttons to select ENGINE ELECTRONICS function. Press "Q" button to enter input. Press right arrow button, then "0" and "2" buttons to select INTERROGATE OR READ DTC MEMORY function. Press "Q" button to enter input.
  4. Scan tool will display DTCs (if any). If NO FAULTS (DTCs) RECOGNIZED is displayed, press right arrow button to return to RAPID DATA TRANSFER function.
  5. If one or more DTCs are stored, refer to DTC IDENTIFICATION TABLE  under DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION to translate DTC to a system or affected circuit description and possible cause and repair.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 5) to step 7). No test procedures have been omitted.
  6. After repairs, press "0" and "5" buttons to select ERASE DTC MEMORY function. Press "Q" button to enter input. After DTCs are erased, press right arrow button.
  7. Press "0" and "6" buttons to select END DATA TRANSFER function. Press "Q" button to enter input. Enter RAPID DATA TRANSFER function and test drive vehicle for at least 10 minutes.
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