Volkswagen Golf / Golf GTI / Jetta. Manual — part 131

01-103

Test prerequisites

The fuses must be OK.

The main fuses must be OK.

The battery voltage must be at

least 11.5 V.

Ground (GND) connection

between engine and body must
be OK.

All electrical devices, e.g. lights

and rear window heating must
be switched off.

If the vehicle is equipped with air

conditioning, it must be turned
off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

Output Diagnosis Test Mode (DTM)

01-104

Fuel Pump (FP) relay -J17- must be OK,

checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

Motronic Engine Control Module (ECM)

Power Supply Relay -J271- must be OK.,
checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

Ignition switched on, engine not running.

Note:

The Output Diagnosis Test Mode (DTM) can

only be carried out if the engine is not running
and ignition is switched on.

The Output Diagnosis Test Mode (DTM) will be

aborted if the engine is started or a rotational
impulse is recognized.

During the Output Diagnosis Test Mode (DTM)

the individual control elements will be activated
for approx. 60 seconds or until advancing to the
next final control by pressing the

button.

The Output Diagnosis Test Mode (DTM) can be

aborted by pressing the -C- button. Therefore
there is no need to continue to the end by
pressing the

button. This is especially

important because the fuel injectors can be
actuated with the

button according to the

firing order and fuel injector.

The electric fuel pump will run during the

complete Output Diagnosis Test Mode (DTM).

Output Diagnosis Test Mode (DTM)

01-105

The Output Diagnostic Test elements are

checked by hearing or by feeling.

The Output Diagnosis Test Mode (DTM) will be

aborted after 10 minutes.

Run engine briefly first if there is a requirement

to repeat Output Diagnosis Test Mode (DTM).

Work sequence

- Connect VAG 1551 scan tool ((VAG 1552).

Then switch ignition on and select Motronic
Engine Control Module (ECM) -J220- with the
"Address word" 01 (Connecting scan tool and
selecting Engine Control Module (ECM)

Page

01-12

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Operate scan tool taking into account

information on display:

- Press buttons -0- and -3- for function "Output

Diagnosis Test Mode (DTM)".

Rapid data transfer

Q

03-Output Diagnosis Test Mode

Indicated on display:

Output Diagnosis Test Mode (DTM)

01-106

1. Activating Evaporative
Emission (EVAP) Canister
Purge Regulator Valve -N80-:

- Confirm input with -Q- button.

Output Diagnosis Test Mode

Fuel Evaporative Emission (EVAP) Canister Purge Regulator Valve

Indicated on display:

The valve clicks but a
malfunction is still suspected
(valve does not open or close):

The Evaporative Emission

(EVAP) Canister Purge
Regulator Valve -N80- must
click until the next final
control element is activated
by pressing

button.

- Disconnect hose from EVAP

canister at regulator valve.

- Connect an auxiliary hose to

vacant valve connection.

- Blow into adapter hose

during Output Diagnosis Test
Mode (DTM) (in direction of
intake manifold).

- Valve must open and close

Output Diagnosis Test Mode (DTM)