The requirements for selecting the desired functions can be taken from the following table.
| Address words and functions on VAG1551 scan tool | Ignition ON, engine not running | Engine idling | Vehicle being driven | |
|---|---|---|---|---|
| Address words | ||||
| 00 | Automatic Test Sequence | Yes | Yes | Yes |
| 01 | Engine Electronics | Yes | Yes | Yes |
| Functions | ||||
| 01 | Check Control Module Version | Yes | Yes | Yes |
| 02 | Check DTC Memory | Yes | Yes | Yes |
| 03 | Output Diagnostic Test Mode (DTM) | Yes | No | No |
| 04 | Basic setting | Yes | Yes | Yes |
| 05 | Erase DTC Memory | Yes | Yes | Yes |
| 06 | End Output | Yes | Yes | Yes |
| 07 | Code Control Module | Yes | No | No |
| 08 | Read Measuring Value Block | Yes | Yes | Yes |
AVAILABLE FUNCTIONS - VAG 1551
| Mode under Address word 33 | |
|---|---|
| Mode 1: Transmit diagnostic data | Switch ignition ON or let engine run at idle |
| Mode 2: Transmit operating conditions | Switch ignition ON or let engine run at idle |
| Mode 3: Check DTC Memory | Switch ignition ON or let engine run at idle |
| Mode 4: Erase diagnostic data | Switch ignition ON or let engine run at idle |
| Mode 5: Output of oxygen sensor signals | Switch ignition ON or let engine run at idle |
| Mode 6: Transmit measured values | Switch ignition ON or let engine run at idle |
| Mode 7: Check DTC Memory | Switch ignition ON or let engine run at idle |
| Mode 8: Check tank leak test | Switch ignition ON or let engine run at idle |
| Mode 9: Read out vehicle information | Switch ignition ON or let engine run at idle |
AVAILABLE FUNCTIONS - VAG 1551, ADDRESS WORD 33
Mode 1 to 9 can be selected under address word 33.
- Individual measured values can be read out under mode 1. Mode 1 is not recommended for authorized Audi service centers, since the data can be obtained much more accurately under address word 01 function 04 or function 08.
- Mode 2 displays operating conditions, for which malfunctions are recognized.
- With mode 3 the DTC memory will be checked and with mode 4 the DTC memory will be erased.
- Mode 5 displays the static dimensions of the oxygen sensors, which are legally required. Since these dimensions are not directly relevant to oxygen sensor diagnostics, mode 5 is insignificant for the authorized Audi center.
- With mode 6 all measured values can be checked from components and systems that are not constantly monitored.
- Using mode 7, DTCs can be checked for which the Malfunction Indicator Light (MIL) is not yet lit (MIL is not on, no DTCs under mode 3).
- Under mode 8 the tank leak test will be checked.
| Address words and functions on VAS 5051 scan tool | Ignition ON, engine not running | Engine idling | Vehicle being driven | |
|---|---|---|---|---|
| Address words | ||||
| 00 | Check all fault memories | Yes | Yes | Yes |
| 01 | Engine Electronics | Yes | Yes | Yes |
| Functions | ||||
| 02 | Check fault memory | Yes | Yes | Yes |
| 03 | Final control diagnosis | Yes | No | No |
| 04 | Basic settings | Yes | Yes | Yes |
| 05 | Erase fault Memory | Yes | Yes | Yes |
| 06 | End Output | Yes | Yes | Yes |
| 07 | Code Control Block | Yes | No | No |
| 08 | Read Data Block | Yes | Yes | Yes |
| 09 | Read single measured value | Yes | Yes | Yes |
| 10 | Adaptation | Yes | No | No |
| 11 | Log-in procedure | Yes | No | No |
| 15 | Readiness code | Yes | Yes | Yes |
AVAILABLE FUNCTIONS - VAS 5051
| Mode under Address word 33 | |
|---|---|
| Mode 1: Obtain data | Switch ignition ON or let engine run at idle |
| Mode 2: Obtain operating conditions | Switch ignition ON or let engine run at idle |
| Mode 3: Check fault Memory | Switch ignition ON or let engine run at idle |
| Mode 4: Reset/delete diagnosis data | Switch ignition ON or let engine run at idle |
| Mode 5: Obtain lambda test results | Switch ignition ON or let engine run at idle |
| Mode 6: Test results - non-continuously monitored components | Switch ignition ON or let engine run at idle |
| Mode 7: Test results - continuously monitored components | Switch ignition ON or let engine run at idle |
| Mode 8: Tank leak test | Switch ignition ON or let engine run at idle |
AVAILABLE FUNCTIONS - VAS 5051, ADDRESS WORD 33