Commission Directive 1999/52/EC of 26 May 1999 adapting to technical progress Council Directive 96/96/EC on the approximation of the laws of the Member States relating to roadworthiness tests for motor vehicles and their trailers (Text with EEA relevance)
Date: 1999-05-26
Institutions: European Commission
Subjects: approximation of laws, commercial vehicle, diesel fuel, motor vehicle, roadworthiness tests, transport regulations

L 142/26

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Official Journal of the European Communities

5. 6. 1999

COMMISSION DIRECTIVE 1999/52/EC

of 26 May 1999

adapting to technical progress Council Directive 96/96/EC on the approximation of the
laws of the Member States relating to roadworthiness tests for motor vehicles and their
trailers

(Text with EEA relevance)

THE COMMISSION OF THE EUROPEAN COMMUNITIES,

Having regard to the Treaty establishing the European Community,

Having regard to Council Directive 96/96/EC of 20 December 1996 and Article 7(2) thereof on
the approximation of the laws of the Member States relating to roadworthiness tests for motor
vehicles and their trailers (1),

(1) Whereas the first auto-oil programme (2) identified the standard of motor vehicles’ mainte-

nance as a key constituent in traffic’s effect on air quality;

(2) Whereas Section 8.2 of Annex II Directive 96/96/EC to specifies the tests to be carried out

at periodic inspections to check that vehicles are properly maintained;

(3) Whereas Section 8.2.2 of Annex II Council Directive 92/55/EEC (3) to specifies that, from
1 January 1996, diesel vehicles need to be tested for the opacity of the generated exhaust
smoke during a transient,
‘free acceleration' engine test where the engine is accelerated
against its own inertia;

(4) Whereas,

this Directive establishes a technical adaptation that will

improve the

performance of roadworthiness testing of diesel engined vehicle emissions;

(5) Whereas, further work needs to be done in the field of developing alternative test proce-
dures to check the maintenance conditions of diesel engined vehicles, particularly
concerning particulates and NOx;

(6) Whereas, the provisions of this Directive are in accordance with the opinion of the
Committee for the Adaptation to Technical Progress of the Directive on Motor Vehicle
Roadworthiness testing established under Article 8 of Directive 96/96/EC,

HAS ADOPTED THIS DIRECTIVE:

Article 1

Directive 96/96/EC is modified as follows:

Annex II, point 8.2.2 is replaced by the following:

‘8.2.2. Motor vehicles equipped with compression ignition (diesel) engines:

(a) Exhaust gas opacity to be measured during free acceleration (no load from idle up

to cut-off speed) with gear lever in neutral and clutch engaged.

(b) Vehicle preconditioning:

1. Vehicles may be tested without preconditioning although for safety reasons
checks should be made that the engine is warm and in a satisfactory mechanical
condition.

(1) OJ L 46, 17.2.1997, p. 1.
(2) Tripartite programme between the oil and motor industries and the European Commission services aimed

at developing vehicle emission and fuel quality standards for the year 2000.

(3) OJ L 225, 10.8.1992, p. 68.

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Official Journal of the European Communities

L 142/27

2. Except as specified in subparagraph (d)(5), no vehicle will be failed unless it has

been preconditioned according to the following requirements.

3. Engine shall be fully warm, for instance the engine oil temperature measured by
a probe in the oil level dipstick tube to be at least 80° C, or normal operating
temperature if lower, or the engine block temperature measured by the level of
infrared radiation to be at least an equivalent temperature. If, owing to vehicle
configuration,
the
engine’s normal operating temperature may be made by other means, for
example by the operation of the engine cooling fan.

the establishment of

this measurement

impractical,

is

4. Exhaust system shall be purged by at least three free acceleration cycles or by an

equivalent method.

(c) Test procedure:

1. Visual inspection of the relevant parts of the motor vehicle’s emission system to

check that there are no leaks.

2. Engine, and any turbocharger fitted, to be at idle before the start of each free
acceleration cycle. For heavy-duty diesels, this means waiting for at least 10
seconds after the release of the throttle.

3. To initiate each free acceleration cycle,

the throttle pedal must be fully
depressed quickly and continuously (in less than one second) but not violently,
so as to obtain maximum delivery from the injection pump.

4. During each free acceleration cycle, the engine shall reach cut-off speed or, for
vehicles with automatic transmissions, the speed specified by the manufacturer
or if this data is not available then two thirds of the cut off speed, before the
throttle is released. This could be checked, for instance, by monitoring engine
speed or by allowing a sufficient time to elapse between initial throttle depres-
sion and release, which in the case of vehicles in categories 1 and 2 of Annex I,
should be at least two seconds.

(d) Limit values:

1. The level of concentration must not exceed the level recorded on the plate

pursuant to Council Directive 72/306/EEC (2).

2. Where this information is not available or where Member States’ competent
authorities decide not to use it as a reference, the limit values of the coefficient
of absorption are as follows: maximum coefficient of absorption for:

 naturally aspirated diesel engines = 2,5 m-1,
 turbo-charged diesel engines = 3,0 m-1

or equivalent values where use is made of equipment of a type different from
that used for EC type-approval.

3. Vehicles registered or put into service for the first time before 1 January 1980

are exempted from these requirements.

4. Vehicles shall only be failed if the arithmetic means of at least the last three free
acceleration cycles are in excess of the limit value. This may be calculated by
ignoring any measurements that depart significantly from the measured mean,
or the result of any other statistical calculation that takes account of the
scattering of
the maximum
the measurements. Member States may limit
number of test cycles.

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5. 6. 1999

5. To avoid unneccessary testing, Member States may, by way of exception from
the provisions of paragraph 8.2.2(d)(4), fail vehicles which have measured values
significantly in excess of the limit values after less than three free acceleration
cycles or after the purging cycles (or equivalent) specified in subparagraph (b)(3).
Equally to avoid unneccessary testing, Member States may, by way of exception
from the provisions of paragraph 8.2.2(d)(4), pass vehicles which have measured
values significantly below the limit values after less than three free acceleration
cycles or after the purging cycles (or equivalent) specified in subpragraph (b)(3).'

Article 2

1. Member States shall bring into force the laws, regulations and administrative provisions
necessary to comply with this Directive before 1 October 2000. They shall forthwith inform the
Commission thereof.

When the Member States adopt these measures they shall contain a reference to this Directive or
shall be accompanied by such reference on the occasion of their official publication. The
methods of making such reference shall be laid down by Member States.

2. Member States shall communicate to the Commission the texts of the provisions of national
law which they adopt in the field governed by this Directive.

This Directive shall enter into force on the day following its publication in the Official Journal
of the European Communities.

Article 3

This Directive is addressed to the Member States.

Article 4

Done at Brussels, 26 May 1999.

For the Commission

Neil KINNOCK

Member of the Commission