Volkswagen Golf / Golf GTI / Jetta. Manual — part 99

26-34

Test sequence

- Test drive vehicle.

Observe the valid safety precautions when road

testing

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During the road test the following operating

conditions must be fulfilled:

The coolant temperature must exceed 85

C.

When the temperature is reached, the

operating conditions

Idling

Part throttle

Enrichment

Wide open throttle

Overrun

must be attained several times.

- Then:

Continue running engine at idling speed.

Secondary air system

26-35

- Connect V.A.G 1551 Scan Tool (or V.A.G 1552).

Start engine and select "Address word" 01 of
engine control module:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s) BDF, Repair Group
01

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press keys 0 and 4 for function "Initiate 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:

Coolant temperature is above 85 C -Display

zone 2-

- Change to display group 77 as follows:

- Press C key.

Secondary air system

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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 keys 0, 7 and 7 for "Display

group number 77" and confirm
entry with Q key.

System in basic setting 77

1

2

3

4

Indicated on display: (1...4

display

zones)

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

Note:

This process can take approx. 40
seconds.

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

- Leave engine running at idling

speed until display zone 4
displays specification "Syst. OK."..

- Press

key.

Secondary air system

26-37

- Press keys 0 and 6 for function "End output" and

confirm entry with Q key.

- Switch ignition off.

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

- Press

key.

- Check DTC memory:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s) BDF, Repair Group
01

- Read readiness code:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s) BDF, Repair Group
01

- Generate readiness code again if DTC memory

has been erased or engine control module
disconnected from permanent positive supply:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s) BDF, Repair Group
01

If no DTC is stored in DTC memory:

- Press keys 0 and 6 for function "End output" and

confirm entry with Q key.

- Switch ignition off.

- Check combi-valve

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Secondary air system