Diesel Turbo Direct Injection (TDI) system, servicing: Notes

WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) is equipped with Diagnostic Trouble Code (DTC) memory.

Before starting repairs, adjustments and/or troubleshooting:

Check DTC memory for possible stored Diagnostic Trouble Codes (DTCs), see CHECK DTC MEMORY (SCAN TOOL FUNCTION 02) .
Check Diesel DFI ECM output signals to components using output Diagnostic Test Mode (DTM), see OUTPUT DIAGNOSTIC TEST MODE, CHECKS .

During checking and adjusting procedures, the Diesel DFI ECM may recognize malfunctions and store DTCs.

For this reason, after completing all checking and adjusting procedures, you must:

Check and erase DTC memory, see ERASE DTC MEMORY (SCAN TOOL FUNCTION 05) .
Re-create readiness code, see READINESS CODE, SETTING (UP TO M.Y. 1997) .