GB/T 19910-2022 English PDF (GBT19910-2022)

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GB/T 19910-2022: Technical requirements for repair of automotive engine electronic control system
GB/T 19910-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.50
CCS R 16
Replacing GB/T 19910-2005
Technical requirements for repair of automotive engine
electronic control system
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Abbreviations ... 6
5 General requirements ... 6
6 Operation procedures ... 7
7 Pre-maintenance inspection... 8
8 Technical requirements for operation ... 8
9 Completion inspection ... 12
10 Warranty period ... 13
Appendix A (Informative) Pre-maintenance inspection record ... 14
Appendix B (Informative) Repair construction sheet ... 16
Appendix C (Informative) Repair operation and process inspection record ... 18
Appendix D (Informative) Repair completed inspection record ... 22
Technical requirements for repair of automotive engine
electronic control system
1 Scope
This document specifies the general requirements, operation procedures, pre-
maintenance inspection, technical requirements for operation, completion inspection,
and warranty period for repair of automotive engine electronic control system.
This document applies to the repair of automotive engine electronic control systems; it
can be used as a reference for the repair of engine electronic control systems of other
types of vehicles.
2 Normative references
The following documents are normatively referenced in this document and are
indispensable for its application. For dated references, only the version corresponding
to that date is applicable to this document; for undated references, the latest version
(including all amendments) is applicable to this document.
GB/T 5624, Motor vehicle maintenance and repair terms
JT/T 816, Motor vehicle maintenance service specification
QC/T 29106, Technical specification of automobile wire harness
3 Terms and definitions
Terms and definitions determined by GB/T 5624 and the following ones are applicable
to this document.
3.1 Engine electronic control system
System that analyzes and processes various parameters in the engine operation, and
controls the engine working condition precisely according to the information of each
sensor.
3.2 Over-the-air upgrade
Technology of wirelessly downloading and updating the automobile software that needs
to be upgraded or modifying the corresponding automobile settings through the mobile
network terminal equipment.
3.3 Freeze data
Instantaneous operation data of the engine, when the fault indicator light is on, which
is recorded by the electronic control unit (ECU).
3.4 Signal wave form
A graph of signal parameters over time.
3.5 On vehicle status
The status in which components are not removed from the vehicle.
3.6 Off vehicle status
The status in which components are removed from the vehicle.
4 Abbreviations
The following abbreviations apply to this document.
ECU: electronic control unit
KOEO: key on engine off
KOER: key on engine run
OBD: on board diagnostics
OTA: over-the-air technology
5 General requirements
5.1 When repairing the engine electronic control system, the technical requirements of
the maintenance and repair manual of the vehicle under repair shall be followed.
5.2 When repairing, repair technicians shall take anti-static measures, and at the same
time do a good job in the safety protection of personnel and vehicles.
5.3 Before repairing the engine electronic control system, self-calibration of the testing
instruments and equipment shall be carried out.
5.4 When removing the battery negative cable, first read and record the fault code
information and personalized settings of the to-be-repaired vehicle.
5.5 When disconnecting the ECU wire connector, turn off the ignition switch first, and
then disconnect the battery negative cable.
7 Pre-maintenance inspection
The pre-maintenance inspection shall meet the requirements of JT/T 816. The vehicle
shall be subject to the pre-maintenance inspection based on the vehicle failure
description, a “pre-maintenance inspection record” (see Appendix A) shall be filled in,
and a “repair construction sheet” (see Appendix B) shall be issued.
8 Technical requirements for operation
8.1 Engine inspection
8.1.1 The connection of the battery shall be firm; the voltage of the battery shall meet
the technical requirements of the vehicle.
8.1.2 The engine oil shall be free from emulsification and deterioration; the oil level
shall meet the technical requirements of the vehicle.
8.1.3 The liquid level of coolant, brake fluid, power steering fluid, etc. shall be between
the highest scale and the lowest scale. Where the liquid level does not meet the
requirements, find out the reason and adjust the liquid level to the specified height.
8.1.4 Vacuum pipelines and fuel pipelines shall be connected correctly and reliably
without spillage or leakage.
8.1.5 Lines shall be free from interference, aging or damage; wire connectors shall be
connected reliably without loosening.
8.1.6 The appearance of sensors, actuators, ECU, etc. shall be intact, without obvious
damage; the installation shall be firm.
8.1.7 Fill the engine inspection results and repair handling suggestion into the “Repair
operation and process inspection record” (see Appendix C).
8.2 Engine basic inspection
8.2.1 Test engine cylinder pressure, fuel pressure, intake pipe vacuum degree, exhaust
back pressure, etc. All parameters shall meet the requirements of the maintenance and
repair manual of the vehicle under repair. If the test results are abnormal, the fault
location shall be determined according to the test results and repair shall be carried out
accordingly.
8.2.2 Check the ignition or injection timing, which shall meet the requirements of the
maintenance and repair manual of the vehicle under repair; otherwise, it shall be
repaired.
8.2.3 Fill each inspection data and repair handling suggestion of the basic inspection of
the engine in the “Repair operation and process inspection record” (see Appendix C).
8.3 Fault verification
8.3.1 The fault shall be tested and verified under the vehicle failure status stated by the
requesting party. If necessary, the fault shall be tested and verified with the company of
the requesting party.
8.3.2 During the process of testing and verifying the fault, the fault phenomenon shall
be observed and confirmed; the tested and verified faults shall be filled in the “Repair
operation and process inspection record” (see Appendix C).
8.4 ECU inspection and confirmation
8.4.1 Use the fault detector to establish a communication connection with the engine
electronic control unit. If communication is unavailable, troubleshoot the
communication failure according to the maintenance and repair manual of the vehicle
under repair.
8.4.2 Use the fault detector to read the software version of the ECU. If there is a new
version upgrade, the ECU software version shall be subject to over-the-air upgrade.
8.4.3 After the over-the-air upgrade of the ECU software version, a test run shall be
carried out to verify and confirm the troubleshooting of the vehicle under repair, and
the over-the-air upgrade status of the ECU software version shall be filled in the “Repair
operatio...