Volkswagen Golf / Golf GTI / Jetta. Manual — part 148

01-171

Work step 14: Evaporative
Emissions (EVAP) Canister
system solenoid valve 1 diagnosis
(Tank ventilation system)

Basic setting

Input display group number XXX

Indicated on display:

Note:

The engine must not be loaded
during this diagnosis, if this occurs
the diagnosis will be interrupted and
will not start again until the engine is
revved-up.

- Press buttons -0-, -7- and -0- for

"Display group number 70" and
confirm entry with -Q- button.

System in basic setting 70

1

2

3

4

Indicated on display: (1 to 4

display zones)

If the diagnosis is initiated by the
Motronic Engine Control Module
(ECM) -J220- the display in display
zone 4 jumps from "Test OFF" to
"Test ON".

Note:

This process can take approx. 30
seconds.

- Leave engine running at idle until

display zone 4 displays:

Specification: TBV OK..

Readiness code

01-172

Note:

TBV stands for Evaporative Emission (EVAP)

Canister Purge RegulatorValve -N80-.

If "TBV n. OK." appears in display zone 4:

- Press

button.

- Check DTC memory, repair Diagnostic Trouble

Codes (DTCs) if necessary and then erase DTC
memory

Page 01-23

, DTC memory, checking

and erasing.

- Read readiness code

Page 01-146

. If the

DTC memory has been erased or the Motronic
Engine Control Module (ECM) -J220- was
disconnected from battery (B+) positive, the
readiness code must be generated again

Page 01-149

.

If no DTC is stored:

- Press buttons -0- and -6- for the function "End

output" and confirm entry with the -Q- button.

- Switch off ignition.

- Check breather lines to EVAP canister (may be

kinked).

Readiness code

01-173

- Check EVAP canister system for

leaks:

Repair Manual, 2.8 Liter VR6 4V

Engine Mechanical, Engine Code(s):
BDF; Repair Group 20

If "TBV OK." appears in display zone
4:

- Press -C- button.

Work step 15: Secondary air
system diagnosis

Basic setting

Input display group number XXX

Indicated on display:

Note:

The engine must not be loaded
during this diagnosis, if this occurs
the diagnosis will be aborted and will
not start again until the engine is
revved-up.

- Press buttons -0, -7- and -7- for

"Display group number 77" and
confirm entry with -Q- button.

System in basic setting 77

1

2

3

4

Indicated on display: (1 to 4

display zones)

If the diagnosis is initiated by the
Motronic Engine Control Module
(ECM) -J220- the display in display
zone 4 jumps from "Test OFF" to
"Test ON".

Note:

This process can take approx. 40
seconds.

Readiness code

01-174

- Leave engine running at idle until display zone 4

displays:

Specification: "Syst. OK."

If "Syst.n.OK." appears in display zone 4:

- Press

button.

- Check DTC memory, repair Diagnostic Trouble

Codes (DTCs) if necessary and then erase DTC
memory

Page 01-23

, DTC memory, checking

and erasing.

- Read readiness code

Page 01-146

. If the

DTC memory has been erased or the Motronic
Engine Control Module (ECM) -J220- was
disconnected from battery (B+) positive, the
readiness code must be generated again

Page 01-149

.

If no DTC is stored:

- Press buttons -0- and -6- for function "End

output" and confirm entry with -Q- button.

- Switch off ignition.

- Check combi-valve:

Repair Manual, 2.8 Liter VR6 4V Engine

Mechanical, Engine Code(s): BDF; Repair Group
26

Readiness code