Page 180 - The Central Motor Vehicles Rules, 1989

152 THE CENTRAL MOTOR VEHICLES RULES, 1989 RULE 115

Union Territory Administration, as the case may be, may, by notification in the Official
Gazette, specify the introduction of measurement of LAMBDA (dimensionless value
representing burning efficiency of an engine in terms of the air/fuel ratio in the exhaust
gases) and tighter emission norms for in-use vehicles with such periodicity as may be
warranted, after ensuring that gas analyzers capable of measuring the values, duly
approved by the testing agencies, are available in such city or area, as the case may be:
PROVIDED FURTHER that testing procedures are prescribed in TAP documents
1
No. 115 and 116 [or AIS 137, as applicable], as amended from time to time:
PROVIDED ALSO that the compliance to the limits prescribed in the above proviso
shall be included in the certificate issued by the vehicle manufacturer in Form 22 or Form
22A, as applicable for the vehicle manufactured on or after 1st October, 2004 :
2
[PROVIDED ALSO that in the case of CNG/LPG motor vehicles operating on
Bi-fuel mode, the test shall be conducted only on CNG/LPG mode:]
3
[PROVIDED ALSO that the test as specified in the Table-A shall not be carried out
if the On Board Diagnostics (OBD) Malfunction Indication Lamp (MIL) of Bharat Stage
IV and Bharat Stage VI vehicle (as applicable) is noticed to be in switched on condition
after starting of engine, and in such cases, the vehicle shall be re-submitted for the above
test after repair or servicing:
PROVIDED ALSO that the testing procedures for vehicles manufactured as per
Bharat State VI emission norms shall be as laid down in AIS 137, as amended from time
to time:
PROVIDED ALSO that in cases of Compressed Natural Gas and Liquefied
Petroleum Gas vehicles as specified at Sl. Nos. 1 and 3 of the Table A, the Lambda
requirement shall be applicable to only Bharat Stage VI Compressed Natural Gas or
Liquefied Petroleum Gas vehicles of categories M1 (with GVW not exceeding 7.5
tonnes), M2, N1, Quadricycle and two or three wheelers.]
(ii) Smoke density for all Diesel driven-vehicles shall be as follows:
4
[TABLE-B
DIESEL VEHICLES

Sl. No. Method of Test Maximum Smoke Density

Light absorption Hartidge
coefficient (1/meter) units
(1) (2) (3) (4)
1. Free acceleration test for turbo charged engine 2.45 65
and naturally aspirated engine for vehicles
manufactured as per pre-Bharat Stage-IV
norms.
2. Free acceleration test for turbo charged engine 1.62 50
and naturally aspirated engine for vehicles
manufactured as per Bharat Stage-IV norms.

1 Inserted vide GSR 410(E), dt. 14-6-2021, w.e.f. 15-6-2021.
2 Inserted vide GSR 84(E), dt. 9-2-2009, w.e.f. 9-2-2009.
3 Inserted vide GSR 881(E), dt. 26-11-2019, w.e.f. 26-11-2019.
4 Substituted, ibid.