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HOMESERVICE MANUALSVOLKSWAGEN2004PASSAT GL, 4D SEDAN, 2.0 E, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETUNE-UP2.0L 4-CYL 2V TDI PD ENGINE MECHANICAL, FUEL INJECTION GLOW PLUG, ENGINE CODE: BHW23 DIESEL FUEL INJECTIONENGINE CONTROL MODULEENGINE CONTROL MODULE DTC MEMORY, CHECKING AND ERASING
2004 Volkswagen Passat GL, 4D Sedan, 2.0 E, Automatic

Engine control module DTC memory, checking and erasing

2004 Volkswagen Passat GL, 4D Sedan, 2.0 E, AutomaticSECTION Engine control module DTC memory, checking and erasing

Special tools, testers and auxiliary items required 

Fig 1: VAS 5051 Vehicle Diagnosis, Testing and Information System
GW00000263Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Vehicle diagnosis, testing, and information system VAS 5051
Fig 2: Diagnostic Cable - VAS 5051/6A
GW00004282Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Diagnostic cable VAS 5051/6A

Work sequence 

  • Connect vehicle diagnosis, testing and information system VAS 5051 as follows:
Fig 3: Locating DLC
GW00001146Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Connect diagnostic cable VAS 5051/6A connector to Data Link Connector (DLC) - arrow  -.
  • Start engine and run at idle speed.

Only when engine does not start:

  • Switch ignition on.

Selecting operating mode 

  • Press button on display for "Vehicle On Board Diagnostic (OBD)".

Selecting vehicle system 

  • Press button "01 - Engine electronics" on display.
Fig 4: Locating Control Module Identification With Code Indicated On The Display
GW00000565Courtesy of VOLKSWAGEN UNITED STATES, INC.

The control module identification with code - 2  - as well as chassis number and immobilizer identification number will be indicated on the display.

NOTE:
  • A print-out is available. Press the Print button if required.

Selecting diagnosis function 

  • Press button "02 - Check DTC memory" on display.
  • If no malfunction is stored in engine control module, "0 DTC(s) detected" is displayed.

If malfunctions are stored in the engine control module, these are shown one below another on the display

  • Press ← key.
  • Press button "05 - Erase DTC memory" on display.
  • Press function "06 - End output".
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.