MaTestLab > ISO Standards > ISO 91412 Road Vehicles- Diagnostic Systems
By content81c70d6e36 | Last updated 9th June 2025

ISO 91412 Road Vehicles- Diagnostic Systems

ISO 91412 is a diagnostic communication protocol that is used to communicate between the vehicle's onboard computer and diagnostic equipment, such as scan tools or diagnostic testers. It was first introduced in 1994 and has since become the industry standard for vehicle diagnostics.

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    Introduction to ISO 91412

    ISO 91412 is an international standard that specifies the diagnostic communication protocol used for the communication between electronic control units (ECUs) in road vehicles. This standard provides a standardized method of communication between ECUs and diagnostic tools, which is essential for the diagnosis and repair of automotive systems. 

    This standard specifies the physical layer requirements for communication between the diagnostic equipment and the vehicle’s ECUs. This standard provides the requirements for the K-line, which is a single-wire serial communication protocol that is used for diagnostic purposes in road vehicles.

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    ISO 91412 Testing
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    ISO 91412 Test Method

    The procedure for using ISO 9141-2 involves connecting a diagnostic tool to the vehicle’s diagnostic connector, which is typically located under the dashboard. The diagnostic tool then sends commands to the vehicle’s ECUs using the K-line protocol specified in ISO 9141-2. The ECUs respond with diagnostic data, which is then displayed on the diagnostic tool for analysis. The following table outlines the testing procedure:

    StepsDescription
    1The diagnostic tool is connected to the ECU using a cable that meets the requirements of the ISO 9141-2 standard.
    2Power on the ECU and initiate communication with the diagnostic tool.
    3A start communication message is sent to the ECU.
    4The response indicates that the ECU has entered diagnostic mode.
    5A request for identification message is sent to the ECU.
    6The response contains identification information for the ECU.
    7A request for diagnostic trouble codes (DTCs) message is sent to the ECU.
    8The response contains a list of any DTCs stored in the ECU.
    9A request for data message is sent to the ECU.
    10The response contains data values for the requested parameters.
    11A stop communication message is sent to the ECU.
    12The response indicates that the ECU has exited diagnostic mode.
    13Next, one has to power off the ECU and disconnect the diagnostic tool.

    ISO 91412 Specimens

    ISO 9141-2 does not involve any physical specimens as it is a standard for communication protocols used in vehicle diagnostics.

    ISO 91412 Results

    ISO 9141-2 is an essential standard in the automotive industry as it provides a standardized method of communication between ECUs and diagnostic equipment. The K-line protocol specified in this standard is used for diagnostic purposes in road vehicles and is crucial for identifying and repairing problems with the vehicle’s systems.

    Tests related to ISO 91412

    ISO 9141-2 is a diagnostic communication protocol and is similar to other standards of the same nature. ISO 14230-4 (also known as Keyword Protocol 2000 or KWP2000) is a related standard that specifies a similar communication protocol for diagnostic communication between road vehicles and diagnostic equipment. KWP2000 is a more modern and advanced protocol than ISO 9141-2 and is used in newer vehicles. 

    FAQ's

    Where can I get the iso 91412 tested?

    You can share your iso 91412 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 91412 test to various testing techniques.

    How much do I need to pay for the iso 91412 test?

    Please contact us for a detailed quote for your iso 91412 testing needs. Cost incurred to carry out different iso 91412 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

    How many samples are required for iso 91412?

    The required number of samples or specimens should comply with the procedure given in the iso 91412 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

    How much discount can I get on the iso 91412 test?

    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.

    How many days will it take to complete the iso 91412 test?

    The turnaround time for iso 91412 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

    Where can I get the iso 91412 tested?

    You can share your iso 91412 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific iso 91412 test to various testing techniques.

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