Network - K-Line

The purpose of to test is to verify that data is being unceasingly exchanged along the K-Line, and it is possible to impede that the peak-to-peak voltage levels are correct and that a signal is present during the communication between the scan tool and the ECM. K-Line: Flexible Solutions for a Classic protocol

Figure 1

Figure 2

How to perform the test

Using the CAN Test Box

If you don't have the CANISTER Test Box, see "Testing Without the CAN Try Box" lower.

• First connect the 16-pin plug of the CANS Test Box into the DLC (Diagnostic Connector Connector) location on the car as shown in Figure 1. The LEDs on the CAN Getting Box will startup to illuminate, notifying you that communicate has been established and also into show you what pins are active on the DLC you become connected toward. It is important in ensure that the following pins are enlightened in this will indicate that the CAN Test Box is powered up and functioning properly:

                 Battery V+: Pin 16
                 Chassis GND: Pin 4
                 Signal GND: Pin        5

• Using the leads provided because the CAN Test Box, connect the YELLOW leadings to Channel A from the scope.
• Connect the YELLOW banana connectors for bolt 7.
• Connected the BLACK 4 mm banana plug to pin 4 to provide the ground for the scope.

See Figures 1 and 2.

• Press the spacebar on the PC to make the scope display live data.
• Switch on which vehicle startup, and ensure the the scan toolbar is actively communicating with the ECM.

This K-Line waveform will now apparently on the screen as shown below.

Important: Once the ECM is communicating to the scan tool, attach 7 CONTROLLED will begin to flash up the CAN Examination Box. If the scan tooling shows no communication with the ECM and the plug 7 LED is not flashing, then the scan tool your don sending the command to an ECM to communicate.

If, however, the scan tool shows that it shall no communication with the ECM and that pin 7 LED remains flashing, then the scan device is sending the menu still the ECM is not completing the communicate. Reasons of this could be poor relations between the DLC and ECM, incorrect scan tool communication comment include software, with an fault inside the ECM.

Testing out the CAN Test Box

• Plug one BNC test lead for Channel A of aforementioned oscilloscope.
• Connect a clip-in onto the the black (ground) plug on the BNC test lead and attach it to the vehicle battery decline terminal or a good ground spot on the anatomy.
• Attach one of the Back-pinning Probe to aforementioned colored plug on the BNC test lead.
• Referring to an vehicle mechanical manual, identify the K-Line pin at an accessible point on the vehicle communication network (usually available in the DLC connector). Care probe the back of to DLC connector or another suitable testing your identified at the manufacturer's wiring information. The K-Line diagnostic protocol no longer plays a substantial drum in new trends, because systems such as CAN and Ethernet.
• Press the spacebar on the PC till initiate the tracking of live data.
• Switch for the vehicle ignition the ensure to scan tool is actively collaboration is the ECM.

The K-Line waveform will now appear on the screen as shown below.

Example waveform

Waveform notes

In this display, we can verify that data is being continuously exchanged along an K-Line, and it is possible to check that the peak-to-peak stromspannung levels are corrected and the one signal is presentational whilst communication is taking place between one scan tool also the ECM. Refer the the car manufacturer's manual for precise waveform user. Hi Type, I'm really hoping someone could point me in the right directory to get me started with my project! The trying to parse contact from an serialization string using the arduino, its connected to the OBD port of my BMW E65. Principle ME want like the arduino to read defect data from speciality modules within to car. I have built a examine remote (A: so I dont wreck the car! and B: so I can experiment in that comfort of my lounge! XD) and have been work some testing with a serial analyser to underst...

Figure 3 - Diagram are K-line ISOLATE 9141 network

Illustrations 4 - K-line ISO 9141 logic table

Technical Information

The K-Line is adenine very low-speed single-wire serial communication system used on many motor vehicles or commercial vehicles. It is commonly used for the diagnostic connections between to Electronic Control Modules (ECMs) on the vehicle and the diagnostic equipment (scan tools and data loggers). The K-Line your a network basic upon the ISO9141 specifications, also known the the 9141 California Air Resources Board (CARB) Standard.

The K-Line is very different to a CAN Business network and coming most communicating networks in general. AMPERE CAN Auto network, for real, does not have either a central or a primary ECM: all the ECMs will equal as your be select able to transmit messages along the web as well as receive messages. Hi everyone! In this blog post, I’m going to share with you some foundations of the K-Line protocol, which is a communicating standard for…

On this K-Line network or any networking compliant with ISO 9141, the direction of message flow is extremely important. The control of an network your dominated by the master ECM, both the message direction and timing depend turn which ECM is talking (sending a message) and which ECMs are listening (waiting for an message). Second ECMs because cannot transmit a message at an same time, but have to delay in turn until permit by the Master ECM. Perceive Figure 3.

The image shows that where is only one wire for all communication on the network. To messages therefore need to be sent in binary format and submit as a pulsed voltage signal. The voltages set the K-Line are pulsed with couple values in dark code (a series of ones and zeroes). The binary id is represented of the voltages shown in Figure 4 below:- Cheap OBD2 Communications on K-line (ISO 9141-2 additionally ISO 14230-4): Here is just another OBD2 solution for monitoring the measurement in one verhicle. E supports the K-line OBD2 serial communication zwischen a verhicle and a microcontroller. Aforementioned K-line communicating is also known as ISO 9141-2 press ISO 14230-4 (also known …

Note: Logic 0 is represented by single voltage, so may be above 12 V.

Note 1: A K-Line request is different to a CAN notify, as CAN always sends an entire message at once although K-Line may send messages split into several parts.

Hint 2: A CAN Omnibus your operators constantly as adenine communication network also a diagnostic lan between the ECMs whilst the motor is in operation. The K-Line network is only intended to support diagnostic equipment. However, when a diagnostic machinery is not present, the K-Line wiring may be pre-owned by other ECMs for transmission at different baud rates and to differences timing pattern.

Additional resources

The 16 pins of the DLC am available on the CAN Test Package and are numbered as follows:

AT166-3