Checking activated charcoal filter solenoid valve 1: Audi 1.6 (BAH)

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

V.A.G 1551 Fault reader

Note:

The vehicle system tester V.A.G 1552 can be used instead of the fault reader V.A.G 1551, however a print-out is not possible.

V.A.G 1551/3 Cable

Test conditions

The fuses must be OK.
The battery voltage must be at least 11.5 V.
All electrical consumers, e.g. lights and rear window heating must be switched off.
No faults must be stored in fault memory

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit
4-Cylinder engine (2-valve, roller rockers), Mechanics
Fault memory
Interrogating and erasing fault memory of engine control unit

Coolant temperature must be at least 80 °C, =>display group 01, display zone 2.

Checking activation

Via final control diagnosis, first check activation of activated charcoal filter solenoid valve 1 (tank breathing valve)

=> Repair group 01; Final control diagnosis; Performing final control diagnosis
4-Cylinder engine (2-valve, roller rockers), Mechanics
Final control diagnosis
Performing final control diagnosis

If activation is OK:

Carry out functional check
=> Page
20-49
.

Functional check

Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select the engine control unit with the "Address word" 01. Connecting fault reader and selecting engine control unit:

=> Repair group 01; General to self-diagnosis; Connecting fault reader V.A.G 1551 and selecting engine control unit
4-Cylinder engine (2-valve, roller rockers), Mechanics
General to self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine control unit

Rapid data transfer
HELP
Select function XXX
Indicated on display:

Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Basic setting
Input display group number XXX
Indicated on display:

Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.

System in basic setting
1
⇒
1
2
3
4
Indicated on display:
(1...4 = Display zones)

Only continue with the test when

The coolant temperature is above 80°C
in -display zone 2-

Change to display group 70 as follows:
Press C key.

Basic setting
Input display group number XXX
Indicated on display:

Press keys 0, 7 and 0 for "Display group number 70" and confirm entry with Q key.

Note:

The engine must not be loaded during this diagnosis because the diagnosis will be interrupted and will not be started again until the engine is revved-up.

System in basic setting
70
⇒
1
2
3
4
Indicated on display:
(1...4 = Display zones)

When the diagnosis is initiated by the engine control unit, the display in display zone 4 jumps from "Test OFF" to "Test ON".

Run engine at idling speed until the specification "TBV OK" is displayed in display zone 4.

Note:

TBV stands for tank breather valve (activated charcoal filter solenoid valve 1).

Press ⇒key.
Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
Switch off ignition.

If "TBV n.OK is indicated in display zone 4:

Check breather lines to activated charcoal filter for possible kinks.
Start final control diagnosis and activate tank venting valve (N80):

=> Repair group 01; Final control diagnosis; Performing final control diagnosis
4-Cylinder engine (2-valve, roller rockers), Mechanics
Final control diagnosis
Performing final control diagnosis

Interrogate fault memory:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit
4-Cylinder engine (2-valve, roller rockers), Mechanics
Fault memory
Interrogating and erasing fault memory of engine control unit