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Connecting VAG 1551 Scan Tool




V.A.G1551 Scan Tool, Connecting And Selecting Control Module For Engine Electronics

Special tools and equipment







- V.A.G1551 Scan Tool (ST)


NOTE:
If V.A.G1551 Scan Tool is not available, use VAG1552 Mobile Scan Tool instead, although this tool cannot produce a print-out.
All functions of the V.A.G1551/1552 scan tools can also be performed using the new VAS5051 tester. Connect VAS5051. Connecting VAS 5051 Scan Tool







- VAG 1551/3 wire

Test requirements







- Fuses no. 28, 29, 30, 32 and 34 must be OK. For vehicles with Front Wheel Drive, also fuse 31.
- Battery voltage must be at least 11.5 volts.
- Ground (GND) connections between engine and chassis must be OK.

Procedure







- Connect V.A.G1551 Scan Tool or VAG1552 mobile Scan Tool using VAG1551/3 adapter.

After Scan Tool is connected:
- Depending on desired function:
switch ignition on
or
start engine, See table "Selectable functions". Selectable Functions When Using VAG1551/1552 or VAS5051


NOTE:
- If nothing is indicated on the display, check voltage supply of diagnostic cable:
- If the displays indicated in the work procedure are not obtained on the display:
- If "Malfunction in data transfer!" is indicated due to entry error, disconnect wire at scan tool, reconnect and perform work steps again.


- Operate scan tool according to indications on display:

Indicated on display


V.A.G - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer*
2 - Blink code output*


* Two operating modes are displayed alternately

- Operate scan tool according to indications on display:
- Press button 1 to select "Rapid data transfer" operating mode 1.
- Press buttons -0- and -1- to select "Engine electronics" address word 01. Press -Q- button to confirm input.

V.A.G1551 Scan Tool display indicates control module identification, e.g.:


3B0907551G 2.8 Liter V6/5V G AT D05 ->
Coding 07551 WSC 00000


- 3B0 907 551G Part No. of control module (for current control module version, see parts catalog)
- 2.8 l Engine displacement
- V6/5V Construction style of engine (V engine, 6 cylinder, 5 valves)
- G Cruise control system activated
- HS = Manual transmission (AT = Automatic Transmission)
- V01 = program version number
- Coding XXXXX = coding of control module, coding version of Engine Control Module (ECM). Programming Control Module (ECM) -J248-, (Function 07)
- WSC XXXXX = Factory identification from V.A.G1551, with which the last coding was performed (if factory coding has not been changed, WSC 00000 will be displayed)


NOTE: If the control module version that is appropriate for this vehicle is not indicated, replace the control module.


An incorrect coding of the Engine Control Module (ECM) causes:
- Driveability problems (shifting pressure, tip-in shock etc.)
- increased fuel consumption
- increased emissions values
- The storage of non-existent malfunctions in DTC memory
- Necessary functions not being performed (oxygen sensor regulation, activation of the EVAP canister system, etc.)
- Reduction in transmission service life

If coding differs from vehicle version:
- Check control module coding, Code Engine Control Module Programming Control Module (ECM) -J248-, (Function 07)
- Press -> button.

Indicated on display


Rapid data transfer HELP
Select function XX


- See repair procedures for further steps.
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