Page 181 - The Central Motor Vehicles Rules, 1989

RULE 115 THE CENTRAL MOTOR VEHICLES RULES, 1989 153

3. Free acceleration test for turbo charged engine 0.7 26
and naturally aspirated engine for 4 wheelers
manufactured as per Bharat Stage VI norms
4. Free acceleration test for turbo charged engine 1.5 48]
and naturally aspirated engine for two/three
wheelers manufactured as per Bharat Stage VI

1
[The free acceleration test shall be carried out using meter type-approved under
sub-rule (3) of rule 116 as given under:—
(a) three times flushing by free acceleration to be undertaken with or without
the sampling probe in the vehicle exhaust, and average maximum rpm of
the three flushings to be recorded;
(b) thereafter, with sample probe inserted in vehicle exhaust during each free
acceleration, maximum no-load rpm reached shall be within the bandwidth
of + 500 rpm of the average value in respect of 3-wheeled vehicles and + 300
rpm of the average value for all other categories of vehicles;
(c) the free acceleration test, mentioned in (b) above, shall be repeated
minimum three times;
(d) the smoke density to be recorded shall be arithmetic mean of these three
readings;
(e) In case the smoke density recorded is not within the limits, then, the test
may be repeated with engine oil temperature measured by a probe in the
oil level dipstick tube to be at least 60˚C:
PROVIDED that the above test shall not be carried out if the On Board Diagnostic
2
(OBD) Malfunction Indicator Lamp (MIL) of [BS-IV or BS-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 FURTHER that only for Type Approval purposes, all new models
type-approved on or before the commencement of the Central Motor Vehicles (Tenth
Amendment) Rules, 2015 and complying with the requirements of free acceleration
smoke as provided in the Central Motor Vehicles (Amendment) Rules, 2012, published
vide notification number GSR 103(E), dated 23rd February, 2012, need not be re
type-approved for compliance to this sub-rule:]
3
[PROVIDED ALSO that for Type Approval purposes, all models type approved
as per the Central Motor Vehicles (11th Amendment) Rules, 2016, published in the
Official Gazette vide notification number GSR 889(E), dated the 16th September, 2016
and complying with requirements of free acceleration smoke as provided in this
sub-rule, need not be re type approved.]
4
[(iii)(a) The emission results obtained during testing as per clause (i) or clause (ii)
above, shall be electronically generated in the Form 59 from the National
Register of Motor Vehicles after verification of mobile number of the vehicle
owner, as the case may be, as laid down in AIS 137 (Part 8) as amended from
time to time.]

1 Substituted vide GSR 498(E), dt. 16-6-2015, w.e.f. 16-6-2015.
2 Substituted for “BS-IV vehicle is switched on” vide GSR 881(E), dt. 26-11-2019, w.e.f. 26-11-2019.
3 Inserted, ibid.
4 Substituted vide GSR 410(E), dt. 14-6-2021, w.e.f. 15-6-2021.