ISO 9141:1989 PDF

Name: ISO 9141:1989 — Road vehicles — Diagnostic systems — Requirements for interchange of digital information
SKU: ISO 9141:1989
Price: 25 EUR
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Road vehicles — Diagnostic systems — Requirements for interchange of digital information

Название (английский):

ISO 9141:1989

Road vehicles — Diagnostic systems — Requirements for interchange of digital information

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 21 сентября 1989 г.
Издание:: ISO IS 9141 edition 1 version 1
ICS:: 43.180

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Описание (английский):

Specifies the requirements for setting up the interchange of digital information between on-board Electronic Control Units (ECUs) of road vehicles and suitable diagnostic testers. This communication is established in order to facilitate inspection, test diagnosis and adjustment of vehicles, systems and ECUs. Does not apply when system-specific diagnostic test equipment is used.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 9141:1989 - "Road vehicles - Diagnostic systems - Requirements for interchange of digital information" defines the electrical and protocol requirements for serial diagnostic communication between on‑board Electronic Control Units (ECUs) and external diagnostic testers. The standard establishes a common method for initialization, signaling, header/key‑word negotiation and data exchange using the automotive K‑line (mandatory) and optional L‑line, enabling inspection, test diagnosis and adjustment of vehicle systems. It does not apply to system‑specific test equipment or to flashing‑code techniques.

Key topics and technical requirements

Physical/configuration rules

ECU connections: one K‑line (unidirectional or bidirectional) and optional L‑line (unidirectional from tester to ECU); bus topologies are supported but must avoid unintended initialization or collisions.
Capacitance and bus sizing: diagnostic tester/cable capacitance (CTE) and ECU/cable/bus capacitances are limited so baud rate and timing remain reliable (example values in the standard: CEcu ≈ 2 nF, CoBw ≈ 3 nF leading to practical baud rates < ~6.6 kbaud in the example).

Signal levels and timing

NRZ coding, specified logic‑level thresholds relative to vehicle battery VB (distinct transmitter/receiver margins).
Slope (rise/fall) times limited to < 10% of bit time.
Baud rate constraints: minimum 10 baud, typical limitation to 10 kbaud (subject to economic/technical revision); address transmission at 5 baud.

Initialization

Multiple methods: external (ignition/switch), grounding K/L for >2 s, or diagnostic‑tester generated initialization pulses (e.g., a 1.8 s logic "0").

Header and key words

ECU sends a header after init: a baud‑rate synchronization pattern followed by at least two key words that identify communication parameters and hardware configuration.
Key word format: 7 data bits (LSB first), parity (odd), stop bit and required idle time after transfer; key words are assigned/validated centrally (FAKRA referenced).

Diagnostic functions supported

Identification of components, output of diagnostic info, reading sensor/parameter values, executing specific actions, and changing ECU data where permitted.

Applications and users

ISO 9141:1989 is relevant to:

Vehicle OEMs and ECU manufacturers (to design interoperable diagnostic interfaces)

Diagnostic‑tester and scan‑tool vendors (to implement K/L-line protocols)

Automotive repair shops, test labs and certification bodies (for diagnostic procedures and tool compatibility)

Aftermarket telematics and service tool integrators needing standard OBD‑style serial communication

Related standards

ISO 4092:1988 - Road vehicles - Diagnostic systems - Vocabulary (referenced)

ISO/TR 7637‑0:1984 - Road vehicles - Electrical interference by conduction and coupling - General and definitions (referenced)

Keywords: ISO 9141:1989, diagnostic systems, K‑line, L‑line, ECU, on‑board diagnostics, serial communication, initialization, header, baud rate, NRZ, automotive diagnostics.

ISO 9141:1989 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 4092:1988

Road vehicles — Diagnostic systems for motor vehicles — Vocabulary

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