ISO 14230-1-2012 pdf free.Road vehicles – Diagnostic communication over K-Line (DoK-Line) – Part 1: Physical layer.
This part of ISO 14230 specifies the physical layer, based on ISO 9141, on which the diagnostic services will be implemented. It is based on the physical layer described in ISO 9141 -2, but expanded to allow for road vehicles with either 12 V d.c. or 24 V d.c. voltage supply.
NOTE In this part of ISO 14230, values given in parentheses apply to 24 V d.c. systems.
2 Normative references
The following referenced documents are indispensable for the application of this document, For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7637-1, Road vehicles — Electrical disturbances from conduction and coupling — Part 1: Definitions and general considerations
ISO 7637-2, Road vehicles — Electrical disturbances from conduction and coupling — Part 2: Electrical transient conduction along supply lines only
ISO 14230-2, Road vehicles — Diagnostic communication over K-Line (00K-Line) — Part 2: Data link layer
ISO 15031-2, Road vehicles — Communication between vehicle and external equipment for emissions-related
diagnostics — Part 2: Guklance on terms, definitions, abbreviations arid acronyms
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15031 -2 and the following apply.
3.1.1 rise time
<transmitters> time taken for the voltage to change from 20 yB/i00 to 80 VB/100, where VB is the vehicle battery voltage
3.1.2 fall time
<transmitters> time taken for the voltage to change from 80 V8J100 to 20 VBI100, where V8 is the vehicle battery voltage
3.2 Abbreviated terms
CTE capacitance contribution of external test equipment and associated cables CoBw capacitance contribution of on-board wiring
4 Conventions
This part of ISO 14230 is based on the conventions discussed in the OSI Service Conventions (ISO/IEC 10731:1994) as they apply for communication services.
5 Document overview
Figure 1 ilustrates the most applicable application implementations utilizing the DoK-Line protocol.
6 Vehicle to external test equipment connection
6.1 K- and L-line configurations
Vehicle ECUs which support the protocol described in Iso 14230 shall support either a one-wire (K line only) or a two-wire (K and L) communication connection for diagnosis, test or maintenance. Vehicle battery voltage. VB. power ground and signal ground shall be provided by the ECU(s) or the vehicle to the tester.
Line K is a bidirectional line. It is used during initialization to convey address information or, in the case of fast initialization, the wake-up pattern from the external test equipment to vehicle ECUs, simultaneously with the L line. After conveying this information, the K line is used for all other diagnostic communications between tester and vehicle ECUs, in both directions. This includes the completion of the initialization sequence and all other communication services as described in ISO 14230-2.
Line L is a unidirectional line and is only used during initialization to convey address information or, in the case of fast initialization, the wake-up pattern from the external test equipment to vehicle ECUs, simultaneously with the K line. At all other times, it should idle in the logic 1 state.
Figure 2 shows the system configurations allowed, indicating the role of each of the lines K and L.ISO 14230-1 pdf download.