Automotive Diagnostic Services

Unified Diagnostic Services (UDS)

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Abstract


An automobile as we know it was not invented in a single day by a single inventor. It is more than an engine and a body; it is a complex machine that has undergone over a century of evolution. Over the years we have seen a constant stream of innovations and improvements in engine design. We have seen the advent of 4 wheel brakes, fuel injection and the automatic transmission.
Detecting a failure in this complex machine would be a tedious task. However, most of the vehicles today include computers (Electronic Control Unit (ECU)), which monitors several sensors, located throughout the engine, fuel and exhaust systems. When the computer system of the car detects a fault, two things are supposed to happen/monitored. First, a warning light on the dashboard is set, to inform the driver that a problem exists. Second the code is recorded in the computer’s memory (Electrically Erasable Programmable Read-Only Memory) so that it can later be retrieved by a technician for diagnosis and repair….

Funding Statement

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Rasmi Ranjan Nayak



1Introduction

An automobile as we know it was not invented in a single day by a single inventor. It is more than an engine and a body; it is a complex machine that has undergone over a century of evolution. Over the years we have seen a constant stream of innovations and improvements in engine design. We have seen the advent of 4 wheel brakes, fuel injection and the automatic transmission.

Detecting a failure in this complex machine would be a tedious task. However, most of the vehicles today include computers (Electronic Control Unit (ECU)), which monitors several sensors, located throughout the engine, fuel and exhaust systems. When the computer system of the car detects a fault, two things are supposed to happen/monitored. First, a warning light on the dashboard is set, to inform the driver that a problem exists. Second the code is recorded in the computer’s memory (ElectricallyErasableProgrammableRead-OnlyMemory) so that it can later be retrieved by a technician for diagnosis and repair.

The key to good auto repair lies in troubleshooting the problem. Problem in cars could be caused due to number of reasons. Proper troubleshooting will eliminate the potential issues that aren’t the real problem and point you in the right direction. This can be achieved through ‘Diagnostics’.

Did you notice when a problem happens in a car or a vehicle? Ok!! Let me say one situation.

There is a Check Engine Light(warning Lamp) present in our car’s dashboard, which alerts us when a problem occurs in the engine control system. Depending on the nature of the problem, the Check Engine Light may come on and go off, remain on continuously or flash. Some intermittent problems will make the Check Engine Light come on only when the fault is occurring. When the problem goes away, the Check Engine Light goes off. So, When the Check Engine Light comes on, a diagnostic trouble code (DTC) is recorded in the on-board computer memory that corresponds to the fault. Some problems can generate more than one trouble code, and some vehicles may have multiple problems that set multiple trouble codes.


2Overview of Diagnostics


2.1Diagnostics

Diagnostics, as the word suggests, is to identify the cause of a problem or a situation. Whenever the ECU finds a problem, it stores that problem as a Diagnostics Trouble Code (DTC) in the ElectricallyErasableProgrammableRead-OnlyMemory (EEPROM) for later retrieval. Diagnostic Tools are used to read data (DTC’s) from the EEPROM to analyze the cause of failure.


2.2Diagnostics Protocol

Protocol refers to a set of rules for communication. Here the communication happens between two ECUs which follow the same rule and able to exchange the information. The protocols which are used for Diagnostics purposes are known as Diagnostics Protocol.

The automotive industry has come up with Diagnostics protocols which are used for diagnostics purposes like, CAN (Control Area Network), K-Line, UDS (Unified Diagnostics Services), and KWP (Keyword Protocol) and so on. Here (in this document) we will study/know about UDS.


2.3Diagnostics Session

Diagnostic session is the basis for/of communication between the ECU and the diagnostic tool. During ‘Diagnostics’ the ECU being analyzed is in a particular session. Basically there are different types of diagnostics sessions like Default Session, Extended Diagnostic Session and ECU Programming Session.

After Ignition on, ECU will be switched to a Default Diagnostic Session and after receiving the request from Diagnostic Tool, the ECU will be switched to the Extended Diagnostic Session. Further, after receiving the ECU Programming Session start request from Diagnostic tool, it will switch to the ECU Programming Session.


2.4Automotive Diagnostic Service

Automotive diagnostic service is the way to discover, what’s wrong with the vehicle if it is not running / behaving properly. Diagnosing a vehicles problem in order to fix or repair a car can be done through a professional automobile diagnostic center. Diagnostic Service uses the read command for retrieving the information/data from ECU and the write command to write/program the data to the ECU.

Some of the services are given below as,

Ø Diagnostic Session Control

Ø ECU Reset

Ø Clear Diagnostic Information

Ø Read DTC Information

Ø Read Data By Identifier

Ø Read Memory By Address

Ø Security Access

Ø Communication Control

Ø Write Data By Identifier

Ø Input Output Control By Identifier

Ø Write Memory By Address

Ø Tester Present

Ø Control DTC Setting

For communicating with the ECU, the diagnostic tool uses either Physical addressing or Functional addressing method. Physical addressing is the kind of addressing where the Diagnostics tool communicates with a single ECU. Functional addressing is where the Diagnostics tool communicates with multiple ECUs.


3DetailedDiagnostic Services

The services supported by the UDS protocol are described in the table below:

Service Name Description
Diagnostic Session Control Used to enable different diagnostic sessions in one ECU or a group of ECUs.
ECU Reset Used by the external diagnostic tool to request an ECU reset based on content of the reset type parameter included in the ECU Reset request message.
Clear Diagnostic Information Used by the external diagnostic tool to clear diagnostic information in one or multiple ECU’s memory.
Read DTC Information Allows a diagnostic tool to read the status of ECU resident Diagnostic Trouble Code (DTC) information from any ECU, or group of ECU’s within a vehicle.
Read Data By Identifier Allows the diagnostic tool to request data record values from the ECU identified by Record data identifier.
Read Memory By Address Allows the diagnostic tool to request memory data from the ECU via provided starting address and size of memory to be read.
Security Access Provides a means to access data and/or diagnostic services, which have restricted access for security, emissions, or safety reasons.
Communication Control Switches on and off the transmission of certain ECU messages
Write Data By Identifier Allows the diagnostic tool to write information into the ECU at an internal location specified by the provided data identifier.
Input Output Control By Identifier Used by the diagnostic tool to substitute a value for an input signal, internal ECU function and/or control an output (actuator) of an electronic system.
Write Memory By Address Allows the external diagnostic tool to write information into the ECU at one or more contiguous memory locations.
Tester Present Used to indicate to an ECU or a group of ECU’s that a diagnostic tool is still connected to the vehicle.
Control DTC Setting Used by diagnostics tool to stop or resume the setting of DTCs in ECU.


3.1Diagnostic Session Control

The “Diagnostic Session Control” service shall be used to enable different diagnostic sessions in one ECU or a group of ECU’s. If no diagnostic session has been requested by the client after start communication a default session shall be automatically enabled in the server. The default session shall support at least the following services stop Communication service and tester Present service.

If a diagnostic session has been requested by the client which is already running, the server shall send a positive response message.

The Diagnostic Session Control request message shall meet the format defined in the Table below:

Data Byte No. Parameter Name Data Value
1 Diagnostic Session Control Service Id 10
2 sub Function
Default Session 01
Programming Session 02
Extended Session 03

Request Message Definition – Diagnostic Session Control

Diagnostic Session Control Responses

Once ECU receives the request message from Tester, it has to send the response message to Tester.

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Diagnostics Session Control Response Service Id 50
2 sub Function 00-FF
3 Session Parameter Record 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Diagnostics Session Control 10
3 sub function 00-FF
Sub function Not supported 12
Incorrect Message Length or Invalid Format 13
Conditions are not correct 22

Negative Response


3.2ECU Reset

The ECU Reset service is used by the external diagnostic tool to request an ECU reset based on content of the reset type parameter included in the ECU Reset request message.

Basically there are two different types of ECU resets.

Hard Reset Soft Reset

Hard Reset:

This type identifies a “hard reset” condition which simulates the power-on/start-up sequences typically performed after an ECU has been previously disconnected from its power supply (i.e Battery). This implies the memory (Volatile or Non-volatile) as well as electronic sub-components directly connected to the ECU are initialized upon request of this reset type which are also initialized during the power-up sequence.

Soft Reset:

This type identifies a “soft reset” condition, which causes the ECU to immediately restart the application program if applicable. Before restarting the application the ECU saves any data in non-volatile memory that might be lost during the startup sequence.

The ECU Reset request message shall meet the format defined in the Table below,

Data Byte No. Parameter Name Data Value
1 ECU Reset Request Service Id 11
2 sub Function
Hard Reset – Positive response required 01
Key On-Off Reset – Positive Response Required 02
Soft Reset – Positive Response Required 03

Request Message Definition – ECU Reset

ECU Reset Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 ECU Reset Response Service Id 51
2 sub Function 00-FF
3 Power Down Time 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 ECU Reset 11
3 sub Function 00-FF
Sub function Not supported 12
Incorrect Message Length or Invalid Format 13
Conditions are not correct 22

Negative Response


3.3Clear Diagnostic Information

The “Clear Diagnostic Information” service is used by the external diagnostic tool to clear diagnostic information in one or multiple ECUs’ memory.

A “Clear DTC information” request shall reset/erase all DTC information including the following:

a) DTC

b) DTC status byte

c) Other DTC related data such as first/most recent DTC, flags, counters, timers, etc. specific to DTC

Data Byte No. Parameter Name Data Value
1 Clear Diagnostic Information Request Service Id 14
2 Group Of DTC [2] = [Group Of DTC High Byte Group Of DTC Low Byte ] 00-FF
3 Emission Related Systems 000000

Request Message Definition – Clear DTC Information

Clear Diagnostic Information Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Clear Diagnostic Information Positive Response Service Id 54

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Clear Diagnostic Information Request Service Id 14
3 sub-function 00-FF
Incorrect Message Length – Invalid Format 13
Conditions Not Correct 22
Request Out Of Range 31

Negative Response


3.4Read DTC Information

This service allows a diagnostic tool to read the status of ECU resident Diagnostic Trouble Code (DTC) information from any ECU, or group of ECU’s within a vehicle.

Requesting the ECU to report Most Recent Confirmed DTC or all Supported DTCs the diagnostic tool shall use the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Read DTC Information request Service Id 19
2 sub-function 00-FF
Report Supported DTCs -Positive Response Required 0A
Report Most Recent Confirmed DTC – Positive Response Required 0E

Request Message Definition – Read DTC Information

Read DTC Information Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Read DTC Information response Service Id 59
2 Report Type 00-FF
Report Number Of DTC By Status Mask 01
Report Number Of Mirror Memory DTC By Status Mask 11
Report Number Of DTC By Severity Mask Record 07
3 DTC Status Availability Mask 00-FF
4 DTC Format Identifier 00-FF
5 DTC Count [ 2] = [DTC Count High ByteDTC Count Low Byte ] 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Read DTC Information 19
3 sub-function 00-FF
Sub Function Not Supported 12
Incorrect Message Length – Invalid Format 13
Request Out Of Range 31

Negative Response


3.5Read Data By Identifier

The “Read Data By Identifier” service allows the diagnostic tool to request data record values from the ECU identified by Record Data identifiers.

Data Byte No. Parameter Name Data Value
1 Read Data By Identifier Request Service Id 22
2 Data Identifier[2] 00-FF

Request Message Definition – Read Data By Identifier

Read Data By Identifier Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Read Data By Identifier Response Service Id 62
2 Data Identifier[2] 00-FF
4 Data Record [2] 00-FF

Positive Response

If an ECU responds positively to a “Read Data By Identifier” request, the response message Data Identifier parameter value shall be an echo of the value provided in the request message by the diagnostics tool

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Read Data By Identifier 22
3 sub-function 00-FF
Incorrect Message Length- Invalid Format 13
Conditions Not Correct 22
Request Out of Range 31
Security Access Denied 33

Negative Response


3.6Read Memory By Address

The “Read Memory By Address” services allows the diagnostics tool to request memory data from the ECU via provided starting address and size of memory to be read.

Read / Write Memory ByAddress Parameter Description
Address And Length Format Identifier This parameter is a onebyte value with eachnibble encoded separately:bit 3 – 0: Length(number of bytes) of the MemoryAddress parameterbit 7 – 4: Length(number of bytes) of theMemory Size parameter
Memory Address The parameter MemoryAddressis the starting addressof ECU’s memory wherethe data is to be writtenor from which thedata is to be read.
Memory Size The parameter MemorySize in the Read / Write MemoryBy Address request messagespecifies the numberof bytes to be read orwritten starting at theaddress specified byMemory Address inthe ECU’s memory.The number of bytesused for this size isdefined by the highnibble (bit 7 – 4) of theAddress And LengthFormat Identifier.
Data Record This parameter is usedby the Read MemoryBy Address positiveresponse messageto provide the requesteddata record values tothe diagnostic tool.The content of theData Record is notdefined in this documentand is vehiclemanufacturer specific.

Read / Write Memory By Address Request Parameters

The “Read Memory By Address” request message shall meet the format defined in table below.

Data Byte No. Parameter Name Data Value
1 Read Memory by Address Request Service ID 23
2 Address And Length Format Identifier 00-FF
3 Memory Address[2] 00-FF
4 Memory Size[2] 00-FF

Request Message Definition – Read Memory By Address

Read Memory By Address Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Read Memory By Address Response Service Id 63
2 Data Record [2] = [data number 1,data number 2] 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Read Data By Identifier 23
3 sub-function 00-FF
Incorrect Message Length- Invalid Format 13
Conditions Not Correct 22
Request Out of Range 31
Security Access Denied 33

Negative Response


3.7Security Access

The purpose of this service is to provide a means to access data and/or diagnostic services, which have restricted access for security, emissions, or safety reasons. The security concept uses a seed and key relationship.

Security Access Request Type Description

Security Access type Description
Request Seed This type specifies thatthe ECU shall transmitto the test device theso called seed valuewith a defined securitylevel for calculating anappropriate key value tounlock the ECU.
Send Key This type signalizes tothe ECU that thediagnostic tool transmitsnow the appropriate keyvalue associated with theseed requested before.

The Security Access request message shall meet the format defined in table below.

Data Byte No. Parameter Name Data Value
1 Security Access Request Service ID 27
2 sub Function = [Security Access type] 00-FF
Request Seed – Positive Response Required 01
Send Key – Positive Response Required 02
3 Security key[1] 00-FF

Request Message Definition – Security Access

Security Access Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Security Access Response Service Id 67
2 Security Access Type 00-FF
3 Security Seed [2] 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 SecurityAccess 27
3 sub-function 00-FF
Sub-Function Not Supported 12
Incorrect Message Length 13
Conditions Not Correct 22
Request Sequence Error 24
Invalid Key 35
Exceeded Number Of Attempts 36
Required Time Delay Not Expired 37

Negative Response


3.8Communication Control

The purpose of this service is to switch on and off the transmission of certain ECU messages.

Control Type description

Some possible Communication Control types are,

Control Type Description
Enable Rx And Tx This type indicates thatthe ECU shall enablereception andtransmission of messages.
Enable Rx And Disable Tx This type indicatesthat the ECU shallenable receptionof messages and disabletransmission of messages.

Communication Type description

Some possible Communication types are,

Control Type Description
Normal Communication Messages This type referencesall application-relatedcommunication
Network Management Communication Messages This type referencesall network managementrelated communication.

The ECU shall perform the requested communication type control after sending the Communication Control positive response message to the diagnostic tool if a positive response is requested (Suppress Position Response Message Indication Bit = FALSE).

In case no response is requested from the diagnostic tool (Suppress Position Response Message Indication Bit = TRUE) then the ECU shall perform the requested communication type control immediately after the successful evaluation of the request message.

The Communication Control request message shall meet the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Communication Control Request Service Id 28
2 Security Function / Sub function 00-FF
Enable Rx And Tx – Positive Response Required 01
Enable Rx And Disable Tx – Positive Response Required 11
Vehicle Manufacturer Specific – Positive Response Required 40-5F
System Supplier Specific – Positive Response Required 60-7E
3 Communication Type 00-FF
Normal Communication Messages 01
Network Management Communication Messages 02

Request Message Definition – Communication Control

Communication Control Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Communication Control Response Service Id 28
2 Control Type 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Communication Control 28
3 sub-function 00-FF
Sub-Function Not Supported 12
Incorrect Message Length 13
Conditions Not Correct 22
Request Sequence Error 31

Negative Response


3.9Write Data By Identifier

The “Write Data By Identifier” service allows the diagnostic tool to write information into the ECU at an internal location specified by the provided data identifier.

Following table defines the possible request and response parameter types,

Data Identifier This parameter identifiesthe ECU’s data record that, the diagnostic tool isrequesting to write to.
Data Record This parameter providesthe data record associatedwith the Data Identifierthat the diagnostic toolis requesting to write to.

The Write Data By Identifier request message shall meet the format defined in the Table below,

Data Byte No. Parameter Name Data Value
1 Write Data By Identifier Request Service Id 2E
2 Data Identifier[2] 00-FF
3 Data Record [2] 00-FF

Request Message Definition – Write Data By Identifier

Write Data By Identifier Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Write Data By Identifier Response Service Id 6E
2 Data Identifier[2] 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Write Data By Identifier 2E
3 sub-function 00-FF
Security Access Denied 33
Incorrect Message Length 13
Conditions Not Correct 22
Request Out Of Range 31

Negative Response


3.10Input Output Control By Identifier

The “Input Output Control By Identifier” service is used by the diagnostic tool to substitute a value for an input signal, internal ECU function and/or control an output (actuator) of an electronic system.

The “Input Output Control By Identifier” request message shall meet the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Input Output Control By Identifier Request Service Id 2F
2 Data Identifier[2] 00-FF
3 Input Output Control Type 00-FF
Return Control To ECU 00
Reset To Default 01
FreezeCurrent State 02
Short Term Adjustment 03

Request Message Definition – Input Output Control By Identifier

Input Output Control By Identifier Responses

The ECU shall send a positive response message if the requested control operation was successfully executed. After an ECU returns a positive response to this service, the diagnostic tool shall assume control over the inputs/outputs specified by the Input Output Data Identifier.

If the response message is positive, then the expected response is as given in the table below.

Data Byte No. Parameter Name Data Value
1 Input Output Control By Identifier Response Service Id 6F
2 Data Identifier[2] 00-FF
3 Input Output Control Type 00-03

Positive response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Input Output Control By Identifier 2F
3 sub-function 00-FF
Incorrect Message Length – Invalid Format 13
Conditions Not Correct 22
Request Out Of Range 31
Security Access denied 33

Negative response


3.11Write Memory By Address

The “Write Memory By Address” service allows the external diagnostic tool to write information into the ECU at one or more contiguous memory locations.

The “Write Memory By Address” request message shall meet the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Write Memory By Address Request Service Id 3D
2 Address And Length Format Identifier 00-FF
3 Memory Address[2] 00-FF
4 Memory Size[2] 00-FF
5 Data Record[2] 00-FF

Request Message Definition – Write Memory By Address

Write Memory By Address Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Write Memory By Address Response Service Id 7D
2 Address And Length Format Identifier 00-FF
3 Memory Address[2] 00-FF
4 Memory Size[2] 00-FF

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Write Memory By Address 3D
3 sub-function 00-FF
Incorrect Message Length – Invalid Format 13
Conditions Not Correct 22
Request Out Of Range 31
Security Access denied 33
General Programming Failure 72

Negative Response


3.12Tester Present

This service is used to indicate to an ECU or a group of ECU’s that a diagnostic tool is still connected to the vehicle and that certain diagnostic services and/or communication that have been previously activated are to remain active.

The “Tester Present” request message shall meet the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Tester Present Request Service Id 3E
2 sub Function XX
Positive Response Required 00
No Positive Response Required 80

Request Message Definition – Tester Present

Tester Present Responses

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Tester Present Response Service Id 7E
2 sub Function 00

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Tester Present 3E
3 sub-function 00-FF
Sub Function Not Supported 12
Incorrect Message Length – Invalid Format 13

Negative Response


3.13Control DTC Setting

The “Control DTCsetting” service is used by a diagnostictool to stop or resume the setting of DTCs in the ECU.

DTC setting type description

The below table defines the possible DTC Setting types,

DTC Setting Type Description
On This type requires theECU to enable settingof DTCs.
Off This type requires theECU to disable settingof DTCs.

The “Control DTC Setting” request message shall meet the format defined in the Table below.

Data Byte No. Parameter Name Data Value
1 Control DTC Setting Request Service Id 85
2 Sub Function 00-FF
On – Positive Response Required 01
Off – Positive Response Required 02

Request Message Definition – Control DTC Setting

Control DTC Setting Responses

If an ECU responds positively to a “Control DTC Setting” request, the DTC Setting type in the response shall match the DTC Setting sent in the request

If the response message is positive, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Control DTC Setting Positive Response Service Id C5
2 sub Function XX

Positive Response

And if the response message is negative, then response should meet the format, given in below table.

Data Byte No. Parameter Name Data Value
1 Negative Response 7F
2 Control DTC Setting 85
3 sub-function 00-FF
Sub Function Not Supported 12
Incorrect Message Length – Invalid Format 13
Conditions Not Correct 22
Request Out Of Range 31

Negative Response


4Conclusion

Due to much technological advancement, today’s cars are more complex than ever before and so the troubleshooting of car’s problem has even become more complex and tedious job. Thanks to advanced diagnostic facilities within the car which assist in pin-pointing the exact cause of trouble in a car.

5Reference

Øwww.auto-diagnostics.info

Øwww.obddiagnostics.com

232 Comments

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  1. Anonymous

    bundle of thx .. — it helped me in understanding the ISO 15765 ………. thx

    Reply

  2. Piyush patil

    Hi — Hi…Thanks a lot for putting this information, it helped me a lot.however, i need to test the Gateway for diagnostic services and for the same i need to test various AUTOSAR modules.Could you please give me a reference for the various SID, that are defined for the Diagnostic purposes.Please do write back.

    Reply

  3. Anonymous

    Hi — Hi thanks a lot for putting these details , its a lot simpler than reading the Standard…. keep up the nice work. Did u happen to do any Single ECU Diagnostics testing using Vector CANoe tool ? I am new to CAPL programming , wondering if you have ever used CDD file to write the CAPL code for automatic testing?

    Reply

    • sudhansu das

      Untitled — Hi Rashmi,Good Job.Its really very useful specially for Interview preparation.And to the above question,the answer is the ECU will stay in “Programming Session” ,Reason : The Programming session shall only be left via an ECU Reset (11 hex) service initiated bythe diagnostic tool, a Diagnostic Session Control (10 hex) service with Session Type equal toDefault session, or a session layer timeout in the ECU.(Taken from UDS 14229 Doc)Hope it clears your doubt :)Regards,Sudhansu

      Reply

    • Anonymous

      Untitled — Hi Nice work, I have one doubt.After Ignition on –> Default Diagnostic Session Request from Diagnostic Tool –>ECU will be switched to the Extended Diagnostic Session. ECU Programming Session start request from Diagnostic tool –> ECU Programming Session.if Ignition off in which state ECU will beIgnition off –>?

      Reply

    • Rasmi Ranjan Nayak

      Untitled — Thanks A Lot…….. I have not written CAPL scripting. I have used CAPL scripting written by others… I am sorry I can not help you on this… But any question regarding DIAG, you can ask me, I will try to answer.

      Reply

    • vaithi

      CAPL is a programming language very similar to C language but it is driven by procedures and actions… please stay tuned in our channel and blog for more updates on CAPL syntaxes and working as live environment…

      Please visit these and find the answer for your question,
      For your question the Clear Explanation and Exact answer pls refer this tutorial

      Tutorial address:

      Blog address :
      http://www.automotiveembeddedsystems.wordpress.com

      Reply

  5. Madhu

    Excellent writeup! RRN, could you provide some info on Routine Control by Identifier as well?

    Reply

  6. Rasmi Ranjan Nayak

    Sorry friends,
    I know the above format is not looking good.
    Because this article was previously posted in knol.com.
    As you all know knol.com is going to be closed by March/April-2012.
    So all my articles were migrated from knol.com to wordpress.com..
    Please let me know how to improve the format and all.

    Thanks for visiting my article.
    I hope this might be helpful for you.

    Thanks Again
    And All The Very Best

    Reply

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      • ram

        hii i have one dout that why there is a difference of 40 between service request and respons?

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  180. aftab

    This is simple, yet detailed write up on UDS. Helped me a lot. Thanks rasmiranjan.

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  184. Ravi

    Hi ,
    I am Ravi. I want to know the meaning of all the 8 staus bits of the DTC Status byte. Can any one explain the meaning of each bit.

    Thanks in advance.
    Ravi

    Reply

  185. Kumar

    Hello Ravi ,

    Here it goes..

    BIt 0 : testFailed (TF)
    Bit 1 : testFailedThisOperationCycle (TFTMC)
    Bit 2 : pendingDTC (PDTC)
    Bit 3 : confirmedDTC (CDTC)
    Bit 4 : testNotCompletedSinceLastClear (TNCSLC)
    BIt 5 : testFailedSinceLastClear (TFSLC)
    Bit 6 : testNotCompletedThisOperationCycle (TNCTMC)
    Bit 7 : warningIndicatorRequested (WIR)

    Hope I have answered your question.

    Regards,
    Kumar

    Reply

  186. chandan

    Thank yo so much for providing this kind of article. I am completely new to automotive concepts But i could understand a lot as it is very well written.

    Reply

  187. harish

    hi Rashmi i am ex KPITen… good article

    Reply

  188. anilkumar yp

    could u please explain briefly diagnostic sessions practically

    Reply

  189. Satish Sharma

    Kindly Explain : What is the Difference/Relation between: Diagnostic Mode, Diagnostic Service, DTC and PID.

    Reply

  190. Anonymous

    Most Valuable Information I have ever come across on Diagnostics and its usages. Good Work and Hats off to you.

    Reply

  191. Surya

    Why 7F has considered for negative response why not other than 7F? any particular meaning ??

    like wise why +40 for positive response ??

    Reply

  192. Kuldip Rajput

    Hello All,

    In the diagnostics, for positive response we are adding 40 to the service ID. why do we add specifically 40 to the service, may i know the reson behind it.
    I would be very thankful to you if any solve my query..

    Reply

  193. Shruthi

    Hi Rashmi.

    For one of test case ,i am getting the “illegal parameter value found” after exceution of the Test case .checked the HTML log file in CANOe tool,all the step are passed ,along with the Passed Testcase ,for me it is getting “Illegal Parameter value found” for Read data by Identifier service id.
    On what condition i will get this error ,and please help me to resolve this issue

    Reply

  194. Shruthi

    Hi Rashmi

    While executing the Test table in CANoe tool for one of test requirements ,getting Request Sequence Error NRC[0x24],Please explain o what scenarion this NRC will occur and how to resolve this .

    Reply

    • vaithi

      Hi Shruthi – NRC 24 is for Sequence error [for example if ISO define some sequence for services then you have to follow the same else it will give you sequence error]

      Assumption : While using security access you have to send seed then key but by mistake if you send directly key then it may throw sequence error…

      Please visit these and find the answer for your question,
      For your question the Clear Explanation and Exact answer pls refer this tutorial

      Tutorial address:

      Blog address :
      http://www.automotiveembeddedsystems.wordpress.com

      Reply

  195. Prasanna Purohit

    Hello, Can you please post article related to CANape and CAPL

    Reply

    • vaithi

      Hi Prasanna, Please visit the mentioned link you will find lot of continuous updates regarding CAN , CANape, CANoe, CANalyzer and CAPL

      Reply

  196. Gil

    Has anyone here used Database Desiger by Kpit for their ODX data? Looking for some ideas on how you buillt and set up your database. If your interested in discussing ODX data please email me. At Mechatronictechnician@gmail.com

    Reply

  197. Mech

    What is the actual difference of KWP2000, GMW, and UDS? Can Anyone elaborate on this?

    Reply

  198. hemanth

    is it necessary to give tester present signal for on-board diagnostics

    Reply

    • vaithi

      Hi Hemanth, It completely depends on tester or client – if you want the ECU should not go to idle state when you not accessing ECU then it is compulsory to use it else no need..

      Please visit these and find the answer for your question,
      For your question the Clear Explanation and Exact answer pls refer this tutorial

      Reply

  199. Subramanyam

    I have a query…How many Services can UDS have..is there any limit

    Reply

    • vaithi

      Totally 25 UDS services are there within 6 functional group.. its fixed … no one have rights to increase or decrease even ISO…

      Please visit these and find the answer for your question,
      For your question the Clear Explanation and Exact answer pls refer this tutorial

      Reply

  200. RAJAN

    Hello, May I know why there is always positive response for the request service id difference is as 40 and Negative response 7F ?

    Reply

    • vaithi

      Its logic is behind 6th bit becomes high always…..

      For your question, Clear Explanation and Exact answer pls refer this tutorial

      Reply

    • vaithi

      For your question, Clear Explanation and Exact answer pls refer this tutorial

      Reply

  203. vaithi

    For your question, Clear Explanation and Exact answer pls refer this tutorial

    Reply

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