Checking activated charcoal filter canister 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
5-Cyl. Injection Engine (4 Valve), Mechanics
Fault memory
Interrogating and erasing fault memory

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

Checking activation

First check activation of activated charcoal filter canister solenoid valve 1 (tank breather (vent) valve), via final control diagnosis:

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

If activation is OK:

Perform functional check
=> Page
20-50
.

Functional check

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

=> Repair group 01; General to self-diagnosis: Connecting fault reader
5-Cyl. Injection Engine (4 Valve), Mechanics
General to self-diagnosis: Connecting fault reader

Rapid data transfer
HELP
Select function XX
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 must be more than 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 (vent) 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 display zone 4 shows "TBV n. OK.":

Check breather lines to activated charcoal filter canister, they may be have kinks.