Checking activated charcoal filter solenoid valve 1 — VW

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-Cyl. Injection engine, (1,4 l-Engine), 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

First check the activation of the activated charcoal filter solenoid valve 1 (tank breather valve) via final control diagnosis.

=> Repair group 01; Final control diagnosis; Performing final control diagnosis
4-Cyl. Injection engine, (1,4 l-Engine), Mechanics
Final control diagnosis
Performing final control diagnosis

If activation is OK:

Perform functional check
=>page
20-51
.

Functional check

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

=> Repair group 01; General to self-diagnosis; Connecting fault reader V.A.G 1551 and selecting engine electronics control unit.
4-Cyl. Injection engine, (1,4 l-Engine), Mechanics
General to self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine electronics control unit.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Press keys 0 and 4 for the "Introduce basic setting" function 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
-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 7, 0 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)

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

Leave engine running at idling speed until display zone 4 displays the specification
TBV OK.
.

Note:

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

Press the ⇒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" appears in display zone 4:

Check breather lines to activated charcoal canister (maybe kinked).
Initiate the final control diagnosis and activate the tank breather valve (N80):

=> Repair group 01; Final control diagnosis; Performing final control diagnosis
4-Cyl. Injection engine, (1,4 l-Engine), Mechanics
Final control diagnosis
Performing final control diagnosis

Interrogate error log:

=> Repair group 01; Fault memory; Interrogating and erasing fault memory of engine control unit
4-Cyl. Injection engine, (1,4 l-Engine), Mechanics
Fault memory
Interrogating and erasing fault memory of engine control unit