Volkswagen Golf / Golf GTI / Golf Variant. Manual - part 82

ST – Generic Scan Tool

1

General Information

(Edition 04.2015)
Included in the contents of this Generic Scan Tool (GST) manual

is a summary table of the vehicle specific OBD II Emission Rela‐

ted DTCs. The DTC table contains DTC Malfunction Criteria,

Threshold Values, Secondary Parameters, Enabling Conditions,

Monitoring Time Length, Frequency of Checks, and MIL Illumi‐

nation information which can be used to accurately monitor and

diagnose emissions related faults and perform functions required

to run Modes 01 through 0A (if applicable) with a hand held scan

tool.
This manual also contains the step by step procedures to accu‐

rately diagnose and repair a component or system once a DTC

has been set. References to repair procedures and wiring dia‐

grams can be found within the diagnostic test procedures.
♦

⇒ “1.1 Safety Precautions”, page 2

♦

⇒ “1.2 Clean Working Conditions”, page 3

♦

⇒ “1.3 High Voltage System General Warnings”, page 4

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

1. General Information     

1

1.1

Safety Precautions

Check for Technical Bulletins that may supersede any information

included in this manual.

WARNING

Failure to follow these instructions may result in personal injury

or possible death.
Check  the  Technical  Bulletins  for  information,  cautions  and

warnings that may supersede or supplement any information

included in this manual.
When performing the drive cycle operation, pay strict attention

to driving conditions and observe and obey all posted speed

limits.
Test equipment must always be secured to the rear seat and

operated by a second person. If test and measuring equipment

is operated from the passenger seat, the person seated could

be injured in the event of an accident involving deployment of

the passenger-side airbag.
The fuel system is under pressure! Before opening the fuel

system, place rags around the connection area. Then release

pressure by carefully loosening the connection.
The engine section of the fuel system, after the high pressure

pump, is under extremely high pressure! When working on en‐

gine or fuel injection system, fuel pressure must be relieved to

residual pressure before opening high pressure components.

Refer to the Service Manual for the proper procedure.
If the battery has not been disconnected, the fuel pump fuse

must be removed before opening the fuel supply system as the

fuel pump may be activated by the driver's door contact switch.
Testing of the EVAP and ORVR systems can result in the es‐

cape of explosive fuel vapor. Do not smoke while testing the

EVAP system, and make sure the area you are working in is

well ventilated.
Observe the following for all procedures, especially in the en‐

gine compartment due to lack of room:

♦ Route lines of all types (e.g. for fuel, hydraulic, EVAP can‐

ister system, coolant and refrigerant, brake fluid, vacuum)

and electrical wiring so that the original path is followed.

♦ Watch for sufficient clearance to all moving or hot com‐

ponents.

♦ Do not touch or disconnect the Ignition Coils, ignition

wires, connecting parts or adapter cables when the igni‐

tion is on or the engine is running or turning at starting

RPM.

♦ Only disconnect and reconnect wires for injection and ig‐

nition system, including test leads, when the ignition is

turned off.

When removing and installing components from full or partially

full fuel tanks, observe the following:

♦ The fuel tank must only be partially full. How much fuel can

remain in the fuel tank may be read in the respective work

description. Empty the fuel tank if necessary.

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

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     Rep. Gr. ST - Generic Scan Tool

♦ Before starting work, switch on the exhaust extraction sys‐

tem and place an extraction hose close to the installation

opening of the fuel tank to extract escaping fuel fumes. If

no exhaust extraction system is available, a radial fan (as

long as motor is not in air flow) with a displacement greater

than 15 m

3

/h can be used.

♦ Prevent fuel from contacting the skin! Wear fuel-resistant

gloves!

When servicing the engine control module (ECM), it may be

necessary to use a heat gun. The heat gun, shear bolts, and

parts of the protective housing will become extremely hot. Use

extreme caution when working with or handling these parts to

avoid personal injury.
Observe operating instructions when working with a heat gun.

To prevent damage (burning) to the wiring and harness con‐

nections, insulation and the electronic components, perform

outlined work steps exactly!
The cooling system is under pressure. To avoid scalding, use

caution when opening the cooling system and servicing cooling

system components!

Caution

The battery must only be disconnected and connected with the

ignition  switched  off.  Otherwise,  the  engine  control  module

(ECM) can be damaged.
The use of nails, paper clips, or another unauthorized materials

to  back-probe  harness  connectors  is  strictly  prohibited  and

may cause damage to the harness connectors, terminal ends

or to a component. Use only the manufacturers test lead kit or

an equivalent aftermarket test lead kit for back-probing all har‐

ness connectors.
Do not use sealants containing silicone. Particles of silicone

drawn into the engine, will not be burned in the engine and will

damage the oxygen sensors.
Secure all hose connections with the correct hose clips (the

same as original equipment).
If engine is to be cranked without starting (for example; as part

of a compression test), remove the fuses for the voltage supply

of ignition coils and the fuel injectors.
An electrostatic charge can lead to functional problems of elec‐

trical  components  of  the  engine,  transmission  and  selector

lever mechanism. Touch a grounded object, e.g. a water pipe

or a hoist, before working on electrical components.
Do not make direct contact with harness connector terminals.
Use only gold-plated terminals when servicing any component

with gold-plated harness connector terminals.

1.2

Clean Working Conditions

Even minor contaminations can lead to malfunctions in the fuel

injection system. When working on the fuel supply/injection sys‐

tem, pay careful attention to the following rules of cleanliness:
♦ Thoroughly clean all connections and the surrounding area

before disconnecting.

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1. General Information     

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♦ Place removed parts on a clean surface and cover. Use lint-

free cloths.

♦ Carefully cover opened components or seal, if repairs are not

performed immediately.

♦ When the system is open, do not work with compressed air.

Do not move vehicle unless absolutely necessary.

♦ Install clean components: Remove the parts being replaced

immediately prior to installation of the new parts. Do not use

parts that have been stored unpacked (e.g. in tool boxes etc.).

♦ Electrical connectors that have been disconnected: Protect

from dirt and moisture. Make sure connections are clean and

dry when reconnecting.

1.3

High Voltage System General Warnings

Before performing any work on the high voltage system, always

check with the importer if there are any questions regarding the

terms “technician trained in electrical systems”, “high voltage

technician”, “high voltage expert”, “high voltage systems”, or “hy‐

brid systems”. Qualifications necessary for most of these terms

are also provided below 

⇒ page 9

 .

Before beginning work on the high voltage system, a high voltage

technician 

⇒ page 9

 , must de-energize the high voltage sys‐

tem. Refer to appropriate repair manual for high voltage system

de-energizing.
For a list of work procedures requiring the high voltage system to

be de-energized, refer to the tables listed below in: Working on

the High Voltage System, Conventional Work Near High Voltage

Components, and General Work 

⇒ page 6

 .

GTI 2014 ➤

Generic Scan Tool - Edition 04.2015

4

     Rep. Gr. ST - Generic Scan Tool