VAG 1551 Scan Tool, Connection and Use
Scan Tool VAG 1551,connecting/reading DTC Memory/erasing DTC Memory/ending output
Notes:
^ The DTC Memory can only be erased after the reading sequence is completed.
^ The main program of the ABS Control Module - J104 is deactivated during OBD, so the systems are not operative
Reading DTC Memory:
^ Observe test requirements.
V.A.G. 1551 Scan Tool Connections:
Connect Scan Tool VAG 1551 to Data Link Connectors (DLC's) in relay carrier on left side of plenum chamber using harness VAG 1551/1
- Connect black connector to black DLC.
Note:
If no display appears, check voltage supply for black DLC. Refer to Data Link Connectors, Checking Wiring
V.A.G. 1551 Scan Tool Display:
Framed text appears on display;
* appears alternately
- Connect white connector to white DLC.
Note:
The blue plug is not required.
- Switch on ignition.
Notes:
^ The HELP button on VAG 1551 can be used to call up additional operating instructions.
^ The -> button is used to advance to the next step in the program.
^ The printer can be switched on by pressing the Print button (indicator light comes on in button)
^ Press button 1 for "Rapid data transfer" mode
Display appears as shown:
Rapid data transfer HELP
Enter address word XX
- Press buttons 0 and 3.
(03 enters address word "Brake electronics").
Display appears as shown:
Rapid data transfer Q
03 - Brake Electronics
- Confirm input with button Q
Control Module identification appears on display.
Display appears as shown:
4A0 907 379 D Brake Electronics
Notes:
^ The "D"suffix in the Control Module identification indicates an ABS Control Module with wheel speed outputs (e.g. vehicles with automatic transmission); the absence of a suffix indicates no wheel speed outputs.
^ Also check parts list for identification of appropriate ABS Control Module - J104.
If Display appears as shown:
Control Module does not answer!
OR
K-wire not switching to Ground/positive
HELP
OR
No signal from Control Module
- Press HELP button to print out a list of possible causes.
- Check wiring connection of Data Link Connectors, Refer to Data Link Connectors, Checking Wiring.
- Check power supply and Ground connection to Control Module - J104 using wiring diagram
- After correcting possible malfunctions enter address word 03 for brake electronics once again and verify with Q button.
If Display appears as shown:
Fault in communication buildup
- Refer to Data Link Connectors, Checking Wiring, to correct possible malfunctions.
- Press -> button.
Display appears as shown:
Rapid data transfer HELP
Select function XX
- Press button 0 and 2. This selects the function "Read DTC Memory"
Display appears as shown:
Rapid data transfer Q
02 - Read DTC Memory
- Acknowledge input with Q button
Display appears as shown:
X malfunctions recognized! ->
Display indicates the number of stored malfunctions or message "No malfunction recognized".
- Press -> button.
The DTCs stored in the memory are now displayed and printed out one after the other.
- Refer to Diagnostic Trouble Code Tables to Determine possible malfunctions.
- Press -> button after last DTC has been displayed and printed out.
Notes:
^ If a malfunction has been recognized: select function 06 to end output, switch off ignition and repair malfunction. Then read DTC Memory again and erase.
^ If a malfunction is present in the system that is not identified by the OBD routine: perform troubleshooting with ABS tester VAG 1710.
Erasing DTC Memory and ending output
Display appears as shown:
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 5. This selects the function "Erase DTC Memory"
Display appears as shown:
Rapid data transfer Q
05 - Erase DTC Memory
- Acknowledge input with button Q.
If Display appears as shown:
Attention!
DTC Memory was not read
There has been an interuption in reading the DTC memory.
Notes:
^ Keep to the specified sequence exactly: i.e. read DTC Memory before erasing.
^ The DTC Memory cannot be erased if, for instance, the ignition is switched off after reading the memory and before erasing, or if the vehicle is moved at a speed above 20 km/h.
After reading the memory display appears as shown:
Rapid data transfer Q
DTC Memory is erased
- Press -> button.
Display appears as shown:
Rapid data transfer HELP
Select function XX
- Press buttons 0 and 6
(06 ends output).
Display appears as shown:
Rapid data transfer Q
06 - end output
- Confirm input with Q button
Display appears as shown:
Rapid data transfer HELP
Output ended
- Switch off ignition.
- Disconnect connectors for Scan Tool V.A.G. 1551.
- Switch on ignition (ABS Warning Light - K47 must go out after a short time).
- Perform road test: increase speed above 30 km/h at least once (ABS Warning Light - K47 must not come on again).