Regulation No. 141-00

Name:Regulation No. 141-00
Description:Tyre Pressure Monitoring Systems (TPMS).
Official Title:Uniform Provisions Concerning the Approval of Vehicles with Regard to their Tyre Pressure Monitoring Systems (TPMS).
Country:ECE - United Nations
Date of Issue:2017-01-30
Amendment Level:Original
Number of Pages:16
Vehicle Types:Car, Light Truck
Subject Categories:Controls and Displays, Electrical and Electronic, Steering, Wheels and Tyres
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Keywords:

vehicle, approval, pressure, tyre, regulation, test, type, paragraph, system, tpms, monitoring, malfunction, annex, warning, time, position, means, tell-tale, tyres, granted, manufacturer, signal, ignition, production, tests, extension, requirements, vehicles, number, drive, maximum, accordance, contracting, procedure, run, authority, regard, agreement, technical, cumulative, speed, information, locking, axle, conditions, parties, inflation, mass, ece, mark

Text Extract:

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E/ECE/324
) Rev.2/Add.140
E/ECE/TRANS/505 )
January 30, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 141-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
VEHICLES WITH REGARD TO THEIR
TYRE PRESSURE MONITORING SYSTEMS (TPMS)
Incorporating:
00 series of amendments Date of Entry into Force: 22.01.17

REGULATION
1. Scope
REGULATION NO. 141-00
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF VEHICLES
WITH REGARD TO THEIR TYRE PRESSURE MONITORING SYSTEMS (TPMS)
2. Definitions
3. Application for Approval
4. Approval
5. Specifications and Tests
6. Supplementary Information
CONTENTS
7. Modifications and Extension of Approval of the Vehicle Type
8. Conformity of Production
12. Penalties for Non-conformity of Production
13. Production Definitively Discontinued
14. Names and Addresses of Technical Services Responsible for Conducting Approval Tests,
and of Type Approval Authorities
ANNEXES
Annex 1
Annex 2
Annex 3
Communication
Arrangements of Approval Marks
Test Requirements for Tyre Pressure Monitoring Systems (TPMS)

2.8. "Cold tyre inflation pressure" means the tyre pressure at ambient temperature, in the
absence of any pressure build-up due to tyre usage;
2.9. "Recommended cold inflation pressure (P )" means the pressure recommended for each
tyre position by the vehicle manufacturer, for the intended service conditions (e.g. speed and
load) of the given vehicle, as defined on the vehicle placard and/or the vehicle owner's
manual;
2.10.
"In service operating pressure (P
)" means the inflation pressure for each tyre position
elevated from the cold pressure (P
) by temperature effects during vehicle usage;
2.11. "Test Pressure (P )" means the actual pressure of the tyre(s) selected for each tyre
position after deflation during the test procedure.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to its tyre pressure monitoring
system shall be submitted by the vehicle manufacturer or by his duly accredited
representative;
3.2. It shall be accompanied, in triplicate, by a description of the vehicle type with regard to the
items specified in Annex 1 to this Regulation:
3.3. A vehicle representative of the vehicle type to be approved shall be submitted to the Type
Approval Authority or the Technical Service responsible for conducting the approval tests.
3.4. The Type Approval Authority shall verify the existence of satisfactory arrangements for
ensuring effective control of the conformity of production before type approval is granted.
4. APPROVAL
4.1. If the vehicle submitted for approval pursuant to this Regulation meets all the requirements of
Paragraph 5. below, approval of that vehicle type shall be granted.
4.2. An approval number shall be assigned to each type approved. Its first two digits (at present
00 for the regulation in its original form) shall indicate the series of amendments incorporating
the most recent major technical amendments made to the regulation at the time of issue of
the approval. The same Contracting Party may not assign the same number to another type
of vehicle.
4.3. Notice of approval or of extension or of refusal of approval of a vehicle type pursuant to this
Regulation shall be communicated to the Contracting Parties to the Agreement which apply
this Regulation by means of a form conforming to the model in Annex 1 to this Regulation.

5.2. Tyre Pressure Detection for Incident-Related Pressure Loss
5.2.1. The TPMS shall illuminate the warning signal described in Paragraph 5.5. within not more
than 10min of cumulative driving time after the in service operating pressure in one of the
vehicle's tyres has been reduced by 20% or it is at a minimum pressure of 150kPa, whatever
is higher.
5.3. Detection for a tyre pressure level significantly below the recommended pressure for optimum
performance including fuel consumption and safety.
5.3.1. The TPMS shall illuminate the warning signal described in Paragraph 5.5. within not more
than 60min of cumulative driving time after the in-service operating pressure in any of the
vehicle's tyres, up to a total of four tyres, has been reduced by twenty per cent or it is at a
minimum pressure of 150kPa, whatever is higher.
5.4. Malfunction Detection
5.4.1. The TPMS shall illuminate the warning signal described in Paragraph 5.5. not more than
10min after the occurrence of a malfunction that affects the generation or transmission of
control or response signals in the vehicle's tyre pressure monitoring system.
5.5. Warning Indication
5.5.1. The warning indication shall be by means of an optical warning signal conforming to
Regulation No. 121.
5.5.2. The warning signal shall be activated when the ignition (start) switch is in the "on" (run)
position (bulb check). This requirement does not apply to tell-tales shown in a common space.
5.5.3. The warning signal must be visible even by daylight; the satisfactory condition of the signal
must be easily verifiable by the driver from the driver's seat.
5.5.4. The malfunction indication may be the same warning signal as the one used to indicate
under-inflation. If the warning signal described in Paragraph 5.5.1. is used to indicate both
under-inflation and a malfunction of the TPMS, the following shall apply: with the ignition
(start) switch in the "on" (run) position the warning signal shall flash to indicate a malfunction.
After a short period of time the warning signal shall remain continuously illuminated as long as
the malfunction exists and the ignition (start) switch is in the "on" (run) position. The flashing
and illumination sequence shall be repeated each time the ignition (start) switch is in the "on"
(run) position until the malfunction has been corrected.
5.5.5. The tell-tale of the warning described in Paragraph 5.5.1. may be used in a flashing mode in
order to provide information about the reset status of the tyre pressure monitoring system in
accordance with the owner's manual of the vehicle.

9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a vehicle type pursuant to this Regulation may be
withdrawn if the requirements laid down in Paragraph 8 are not complied with.
9.2. If a Contracting Party to the Agreement, which applies this Regulation, withdraws an approval
it has previously granted, it shall forthwith so notify the other Contracting Parties applying this
Regulation, by means of a copy of the approval form bearing at the end, in large letters, the
signed and dated annotation "APPROVAL WITHDRAWN".
10. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of vehicle approved in
accordance with this Regulation, he shall so inform the authority which granted the approval.
Upon receiving the relevant communication that authority shall inform thereof the other
Contracting Parties to the Agreement applying this Regulation by means of a copy of the
approval form bearing at the end, in large letters, the signed and dated annotation
"PRODUCTION DISCONTINUED".
11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Contracting Parties to the Agreement which apply this Regulation shall communicate to
the United Nations Secretariat the names and addresses of the Technical Services
responsible for conducting approval tests and of the Type Approval Authorities which grant
approval and to which forms certifying approval or extension or refusal or withdrawal of
approval, issued in other countries, are to be sent.

9. Brief description of the vehicle type: ..............................................................................................
9.1. Mass of the vehicle when tested: ....................................................................................................
Front axle: ......................................................................................................................................
Rear axle: .......................................................................................................................................
Total: ...............................................................................................................................................
9.2. Marking and wheel size(s) of standard unit equipment: .................................................................
9.3. Brief description of the tyre pressure monitoring system ...............................................................
10. Result of the tests:
"Puncture test"
"Diffusion test"
"Malfunction test"
Measured
Time to warning
(mm:ss)
11. Position of approval mark: ............................................................................................
12. Reason(s) of extension (if applicable): .........................................................................
13. Approval granted/refused/extended/withdrawn ...........................................................
14. Place: ............................................................................................................................
15. Date: .............................................................................................................................
16. Signature: .....................................................................................................................
17. The list of documents deposited with the Type Approval Authority which has granted approval
is annexed to this communication and can be obtained upon request.

ANNEX 3
TESTS FOR TYRE PRESSURE MONITORING SYSTEMS (TPMS)
1. TEST CONDITIONS
1.1. Ambient Temperature
The ambient temperature shall be between 0°C and 40°C.
1.2. Road Test Surface
The road shall have a surface affording good adhesion. The road surface shall be dry during
testing.
1.3. The tests shall be conducted in an environment free of interferences from radio wave.
1.4. Vehicle Conditions
1.4.1. Test Weight
The vehicle may be tested at any condition of load, the distribution of the mass among the
axles being that stated by the vehicle manufacturer without exceeding any of the maximum
permissible mass for each axle.
However, in the case where there is no possibility to set or reset the system, the vehicle shall
be unladen. There may be, in addition to the driver, a second person on the front seat who is
responsible for noting the results of the tests. The load condition shall not be modified during
the test.
1.4.2. Vehicle Speed
The TPMS shall be calibrated and tested:
(a)
(b)
In a speed range from 40km/h and 120km/h or the vehicle's maximum design speed if it
is less than 120km/h for the puncture test to verify the requirements of Paragraph 5.2. to
this Regulation; and
In a speed range from 40km/h and 100km for the diffusion test to verify the requirements
of Paragraph 5.3 to this Regulation and for the malfunction test to verify the requirements
of Paragraph 5.4. to this Regulation.
The whole speed range shall be covered during the test.
For vehicles equipped with cruise control, the cruise control shall not be engaged during
testing.
1.4.3. Rim Position
The vehicle rims may be positioned at any wheel position, consistent with any related
instructions or limitations from the vehicle's manufacturer.

2.4.3. Within the 5min of completing the learning phase, measure the warm pressure of the tyre(s) to
be deflated. The warm pressure shall be taken as the value P . This value will be used for
subsequent operations.
2.5. Deflation Phase
2.5.1. Procedure for the Puncture Test to Verify the Requirements of Paragraph 5.2. To this
Regulation.
Deflate one of the vehicle's tyres within 5min of measuring the warm pressure as described in
Paragraph 2.4.3. above, until it is at P -20%, or it is at a minimum pressure of 150kPa,
whichever is higher, namely P . Following a stabilisation period of between 2 and 5min the
pressure P shall be rechecked and adjusted if necessary.
2.5.2. Procedure for the Diffusion Test to Verify the Requirements of Paragraph 5.3. to this
Regulation.
Deflate all four tyres within 5min of measuring the warm pressure as described in
Paragraph 2.4.3. above, until the deflated tyres are at P – 20% plus a further deflation of
7kPa, namely P . Following a stabilisation period of between 2 and 5min the pressure P
shall be rechecked and adjusted if necessary.
2.6. Low Tyre Pressure Detection Phase
2.6.1. Procedure for the Puncture Test to Verify the Requirements of Paragraph 5.2. to this
Regulation.
2.6.1.1. Drive the vehicle along any portion of the test course (not necessarily continuously). The sum
of the total cumulative drive time shall be the lesser of 10min or the time at which the low tyre
pressure tell-tale illuminates.
2.6.2. Procedure for the Diffusion Test to Verify the Requirements of Paragraph 5.3. to this
Regulation.
2.6.2.1. Drive the vehicle along any portion of the test course. After not less than twenty (20) min and
not more than forty (40) min bring the vehicle to a complete standstill with the engine switched
off and the ignition key removed for not less than one (1) min or more than three (3) min.
Resume the test. The sum of the total cumulative drive time shall be the lesser of sixty (60) min
of cumulative driving under the conditions set out in Paragraph 1.4.2. above or the time at
which the low tyre pressure tell-tale illuminates.
2.6.3. If the low tyre pressure signal did not illuminate, discontinue the test.
2.7. If the low tyre pressure tell-tale illuminated during the procedure in Paragraph 2.6. above,
deactivate the ignition locking system to the ''Off'' or ''Lock'' position. After a 5min period,
reactivate the vehicle's ignition locking system to the ''On'' (''Run'') position. The tell-tale must
illuminate and remain illuminated as long as the ignition locking system is in the "On" ("Run")
position.
2.8. Inflate all of the vehicle's tyres to the vehicle manufacturer's recommended cold inflation
pressure. Reset the system in accordance with the instructions of the vehicle manufacturer.
Determine whether the tell-tale has extinguished. If necessary, drive the vehicle until the
tell-tale has been extinguished. If the tell-tale does not extinguish, discontinue the test.

Tyre Pressure Monitoring Systems (TPMS).