Diagnostic Trouble Code (DTC) Memory, checking and erasing

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.

Connect VAG 1551 Scan Tool (ST) with adapter harness.
- 1993 m.y. See VAG 1551 Scan Tool (ST), connecting (1993 m.y.)
- Starting 1994 m.y. See VAG 1551 SCAN TOOL (ST), CONNECTING (STARTING 1994 M.Y.)
Start engine and let idle.

If engine does not start:

Switch ignition ON.
Operate starter for approx. 6 seconds, then DO NOT switch ignition off.

Operate VAG 1551 Scan Tool (ST) according to the display:

Press button -1- for "Rapid data transfer" operating mode.
Press PRINT button (indicator lamp in button lights up).
Press -Q-button to confirm input.
Press -->button
Press buttons -0- and -2- to select the "Check DTC Memory" function.
Press -Q-button to confirm input.

The number of stored Diagnostic Trouble Codes (DTCs) will be indicated or "No DTC recognized" will be displayed.

Fig 1: VAG 1551 Scan Tool Display - Checking And Erasing (1 Of 4)

Fig 2: VAG 1551 Scan Tool Display - Checking And Erasing (2 Of 4)

NOTE: If anything else appears in the display. See VAG 1551 SCAN TOOL (ST), SELECTING FUNCTION .

The stored Diagnostic Trouble Codes (DTCs) will be displayed and printed out in sequence.

If no Diagnostic Trouble Code is recognized:

Press button.

If one or more DTCs are stored:

Press buttons -0- and -5- to select "Erase DTC Memory" function.
Press -Q-button to confirm input.

Indicated on display

Fig 3: VAG 1551 Scan Tool Display - Checking And Erasing (3 Of 4)

NOTE: If the ignition was switched off between checking and erasing the DTC Memory, the DTC Memory will not be erased.

Press button.

Indicated on display

Fig 4: VAG 1551 Scan Tool Display - Checking And Erasing (4 Of 4)

When DTC Memory is clear (no DTC recognized or DTC Memory is erased):

Press buttons -0- and -6- to select the "End output" function.
Press -Q-button to confirm input.
In the Diagnostic Trouble Code (DTC) table, look up the Diagnostic Trouble Codes that are printed out, and repair. See DIAGNOSTIC TROUBLE CODE (DTC) TABLE .

NOTE: The DTC table lists DTCs in sequence according to the 5 - digit code.

Test-drive car for at least 10 minutes.

While test driving:

Coolant temperature must be over 80° C (17° F) for at least 3 minutes
At engine speed over 4600 RPM, briefly press Accelerator Pedal to the floor
In the 4th gear, starting from approx. 50 KM/H (30 MPH), accelerate for about 4 seconds with Accelerator Pedal pressed halfway down

Check and erase DTC Memory again. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .