Jetta L4-1.8L Turbo (AWD) (2000)
-
Fuse No. 43 must be OK.
Functional check
-
Connect VAG 1551 scan tool ((V.A.G 1552). Start engine and select the engine control module with the "Address word" 01. Connecting scan tool
and selecting engine control module:
Indicated on display:
Rapid data transfer
HELP
Select function XX
-
Press keys 0 and 8 for the "Read measured value block" function and confirm entry with Q key.
Indicated on display:
Read measured value block
Input display group number XXX
-
Press keys 0, 7 and 0 for "Display group number 70" and confirm entry with Q key.
Indicated on display: (1 to 4 = Display zones)
Read measured value block 70
->
1
2
3
4
-
Press key 4 for the "Basic setting" function ("Tank venting valve diagnosis" will be initiated)
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.
Indicated on display: (1 to 4 = Display zones)
System In basic setting 70
->
1
2
3
4
When the diagnosis is initiated by the engine control module, 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 (Evaporative Emission (EVAP) canister purge regulator valve).
If "TBV not OK" appears in display zone 4:
-
Initiate the Output Diagnostic Test Mode and activate the Evaporative Emission (EVAP) canister purge regulator valve (N80):
-
Check DTC memory:
-
Read out readiness code:
-
If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated
again.
If the specification "TBV OK" is obtained: