On Board Diagnostic (OBD), general information: Function: Notes

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1995 Volkswagen Jetta III, 1995 Volkswagen Golf III, 1995 Volkswagen Cabrio, 1994 Volkswagen Jetta III, and 1994 Volkswagen Golf III. However, it is still accessible from the selected car via links, so may be relevant.

The 096 automatic transmission is controlled electro-hydraulically. "On Board Diagnostic" capability refers specifically to the electrical and electronic controls.

The Transmission Control Module (TCM) -J217- receives input signals from components that effect gear selection, and sends output signals to solenoid valves that control gear selection in the valve body.

The TCM -J217- is equipped with Diagnostic Trouble Code (DTC) Memory so that, in the event of an electrical/electronic component malfunction or an open circuit, the cause of the malfunction can be determined quickly.

Malfunctions in the monitored sensors or components are stored in DTC Memory along with an indication of the type of malfunction

Malfunctions that occur only occasionally are defined as "sporadic" malfunctions and are coded as such.

The Transmission Control Module (TCM) -J217- analyzes the information and distinguishes different types of malfunctions. Those that do not reoccur within 5 to 20 km (3 to 12 miles) or 6 to 24 minutes are stored as sporadic malfunctions.

Electrical malfunctions that affect vehicle performance can be identified using the VAG 1551 Scan Tool (ST). The On Board Diagnostic (OBD) capabilities can only be fully exploited using operating mode 1 ("Rapid data transfer").

Functions of the VAG 1551 Scan Tool (ST). See LIST OF SELECTABLE FUNCTIONS .

You can check the DTC memory and display the Diagnostic Trouble Codes (DTCs) after initiating the On Board Diagnostic (OBD) program using the VAG 1551 Scan Tool (ST). See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING .

Diagnostic Trouble Code (DTC) table. See DIAGNOSTIC TROUBLE CODE (DTC) TABLE .