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.
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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
.
Before beginning work on the high voltage system, a high voltage
, 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
GTI 2014 ➤
Generic Scan Tool - Edition 04.2015
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Rep. Gr. ST - Generic Scan Tool
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