JP2003260991A - Failure diagnostic device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a failure diagnostic device for a vehicle capable of discriminating and displaying an on-vehicle system in a short time and shortening a failure diagnostic work. <P>SOLUTION: A control is performed by connecting an electronic control device of each on-vehicle system A, B... to a communication line, outputting control data to the communication line and performing data communication with each other. The discrimination of the on-vehicle electronic control device is completed in an extremely short time by connecting the failure diagnostic device for the vehicle to the communication line, simultaneously reading message ID outputted to the communication line by the electronic control device in step 11, collating the data with a data base in step 12, etc., and discriminating the on-vehicle electronic control device. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle failure diagnosis device capable of specifying an electronic control device mounted on a vehicle and making a failure diagnosis thereof.

[0002]

2. Description of the Related Art A vehicle failure diagnosis device is widely used in vehicle dealers, service factories, etc., and performs a failure diagnosis of an electronic control unit for controlling a system such as an engine and an automatic transmission mounted on the vehicle. Sometimes used. This failure diagnosis is performed by connecting the vehicle failure diagnosis device to a connection line to which a plurality of electronic control devices are connected and establishing a communication link between them. By using this communication link, the self-diagnosis information, various control data, and the like stored in the storage unit of each electronic control device can be acquired, recorded, and displayed on the vehicle failure diagnosis device side.

Since the number of on-vehicle electronic control devices mounted per vehicle is increasing with the improvement of vehicle performance in recent years, for example, between electronic control devices of each system such as an engine and an automatic transmission. There is an increasing number of cases in which data and failure information are exchanged and shared, used for own system control, or executed for total vehicle control. To achieve this purpose, in-vehicle communication means such as CAN protocol has been used to exchange data between vehicle-mounted electronic control devices. Along with this, even in the vehicle failure diagnosis device, the same communication means as the in-vehicle communication means can be supported so that a communication link with the electronic control device can be realized.

In such a vehicle failure diagnosis device, at the time of failure diagnosis, the connector on the vehicle failure diagnosis device side is connected to the vehicle-side diagnosis connector to execute the failure diagnosis on each on-vehicle electronic control unit. . In that case, prior to the failure diagnosis itself, it is first necessary to identify which system the electronic control unit installed in the vehicle is for an engine or an automatic transmission (AT).

Therefore, when the above-mentioned connection is completed, the vehicle failure diagnosis device outputs a reply request signal to each electronic control device of all the systems which may be mounted on the vehicle, and each electronic control device is outputted. To output a reply signal from. Among the output partners, the vehicle failure diagnosis device does not have these systems for the electronic control device system that did not return a reply signal to the vehicle failure diagnosis device within a predetermined time. On the other hand, the electronic control devices that have returned replies are identified as those systems installed in the vehicle.

On the basis of these identification results, the vehicle failure diagnosing device displays the system name of the electronic control unit, such as engine, A, on the display, which is its display unit.
Since the names such as T are displayed, it becomes possible for the operator to appropriately select from the displayed electronic control devices and perform the failure diagnosis.

In the above-described conventional vehicle failure diagnosis device, the on-vehicle electronic control device is identified according to the flow shown in FIG. As described above, prior to the failure diagnosis, the vehicle failure diagnosis device is connected to the vehicle-side diagnosis connector, and then the ignition switch is turned on, and then the start button of the vehicle failure diagnosis device is pressed. To do. The vehicle failure diagnosis device thereby starts the identification of the electronic control unit and the failure diagnosis.

First, in step 21, each vehicle electronic control unit transmits a reply request signal from the vehicle failure diagnosis device to the system A on a communication line for exchanging data.
Go to step 22. In step 22, it is determined whether or not 1 second has elapsed from the transmission of the reply request signal to the system A.

The reason for setting 1 second here is as follows. In the electronic control device of each system, since the control of each system and in-vehicle communication are set to have a higher priority than the reply request from the vehicle failure diagnosis device,
These controls and in-vehicle communication are executed with priority over the reply request. As a result, it may take several hundred msec (milliseconds) to receive a reply. Therefore, the vehicle failure diagnosis device is supposed to stand by for 1 sec. If 1 sec has not elapsed, the process proceeds to step 23, but if 1 sec has elapsed, the process proceeds to step 25.

In step 23, it is determined whether or not there is a reply from the electronic control unit of system A. If there is a reply, go to step 24, and if there is no reply, step 22
Return to. In step 24, since there is a reply from the electronic control unit of the system A, it is judged that the vehicle is equipped with the system A, and "System A" is displayed on the display screen of the vehicle failure diagnosis device. , Go to step 26.

On the other hand, the situation where no reply is received continues for 1 sec.
When c has passed, it is determined in step 25 that the vehicle is not equipped with the system A, and the process proceeds to step 26 without displaying anything on the display screen. At step 26, since the identification of the system A is completed, the system B, which is the next identification target, is moved to the system B.
A reply request signal to the vehicle is transmitted to the communication line on the vehicle side. Hereinafter, as in the case of the system A, it is determined whether the system B is installed in the vehicle. Although not particularly shown, the systems after the system C are sequentially determined and identified in the same manner.

[0012]

In such a conventional fault diagnosing device, when a reply request signal is first transmitted to each electronic control device and there is no reply, the maximum value is returned for each electronic control device. Wait about 1 second. That is,
More specifically, in the vehicle failure diagnosis device, when a reply request signal is transmitted and no reply is received, after waiting for a reply for about 300 msec from the time of transmission, the electronic control device that has not received a reply is again Send a reply request signal.
In this way, if no reply is received even after repeating the transmission of the reply request signal three times, it is determined that the electronic control device that has not received a reply is an electronic control device that is not mounted on the vehicle. .

Therefore, in order to confirm that one electronic control unit is not mounted on the vehicle, 300 msec is required.
× 3 = 900 msec (about 1 sec) or more is required. The time of 300 msec is a value defined by the standard as the time to wait for a reply when the failure diagnosis device transmits a reply request signal and there is no reply.

There are, for example, 30 types of electronic control devices that may be installed in various vehicles subject to failure diagnosis, and 5 types of electronic control devices are installed in the vehicle subject to failure diagnosis this time. Therefore, in order to identify the on-vehicle electronic control unit, there is no response other than the time required for the response from the five types of electronic control units mounted on the vehicle.
Seeds (hence 1 sec / piece x 25 pieces = 25se
c) has to wait, and it will take at least 25 seconds.

Therefore, it takes time to identify the presence / absence of all the systems, and as a result, the vehicle failure diagnosis device is connected to the vehicle side and then mounted on the display unit. The operator has to wait for a long time until the displayed system name is displayed, resulting in deterioration of the efficiency of the failure diagnosis work. It should be noted that the increase in the time required for this identification becomes more remarkable as the number of systems (and hence the number of electronic control units) increases in the situation where the number of systems mounted on a vehicle increases recently. Therefore, it is an object of the present invention to provide a vehicle failure diagnosis device capable of identifying a vehicle-mounted system in a shorter time and shortening the failure diagnosis work.

[0016]

According to a first aspect of the present invention, a control line is connected to each other, and control data is output to the communication line to perform data communication with each other via the communication line to control each controlled object. A failure diagnosis device for a vehicle, which is connected to a plurality of vehicle-mounted electronic control devices that execute the above-mentioned method via a communication line to perform a failure diagnosis of the plurality of electronic control devices, each electronic control device outputting to a communication line. Based on the specific data included in the control data for specifying the electronic control device that has output the control data, the electronic control device is provided with identification means for identifying the electronic control device mounted on the vehicle, and the identification means is mounted on the vehicle. The failure of the electronic control unit that was identified as "1" was diagnosed.

According to a second aspect of the present invention, when a plurality of electronic control devices cannot receive the control data output from other electronic control devices, the electronic control device outputs the control data that cannot be received. The communication means includes storage means for storing communication failure device identification data to be specified, and the identification means identifies the communication failure device identification information recorded in the storage means of the electronic control device identified as being mounted on the vehicle based on the identification data. The data is read, and the electronic control unit with communication failure mounted on the vehicle is identified based on the read communication failure device identification data.

The third aspect of the present invention further comprises notifying means for notifying information for specifying the electronic control device identified as being mounted on the vehicle by the identifying means. Further, the invention of claim 4 is based on the information specifying the electronic device which is identified as being mounted in the vehicle on the basis of the specifying data by the notifying unit, and the communication failure device specifying data read from the storage unit. The information for specifying the electronic control device is notified in a different form.

[0019]

According to the first aspect of the present invention, the vehicle failure diagnosis device identifies the electronic control device mounted on the vehicle based on the specific data included in the control data output by each electronic device. Since the means is provided, it is not necessary to identify whether or not the electronic control device is installed in the vehicle for all electronic control devices that may be installed in the vehicle, and the electronic control device installed in the vehicle is identified. The working time can be shortened and the working efficiency of the worker is improved.

According to the second aspect of the invention, when the plurality of electronic control devices cannot receive the control data respectively, the communication failure device specifying data for specifying the electronic control device outputting the control data which cannot be received is electronically controlled. The communication failure device identification data stored in the storage means of the device and stored in the storage means of the electronic control device, which is identified by the identification means as being mounted on the vehicle based on the specific data, is read out. Since the electronic control device mounted on the vehicle is identified based on the read communication failure device identification data, even if there is an electronic control device that is mounted on the vehicle but cannot receive the specific data due to communication failure, It can be identified that it is installed in the vehicle.

According to the third aspect of the present invention, since the notifying means for notifying the information for identifying the electronic control device identified as being mounted on the vehicle is provided, the operator who performs the failure diagnosis is mounted on the vehicle. It is possible to easily recognize the electronic control device that is present.

In the invention of claim 4, the notifying means notifies the information for specifying the electronic control unit based on the specific data and the information for specifying the electronic control unit based on the communication failure device specifying data in different forms. Therefore, regardless of whether there is a communication failure, all the electronic control devices installed in the vehicle can be surely recognized by the operator who performs the failure diagnosis, and it is easy to identify which electronic control device has the communication failure. You can also recognize.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. FIG. 1 is a block diagram showing the configuration of the embodiment. The vehicle 1 to be subjected to vehicle diagnosis includes five electronic control units ECU-A, ECU-B, ECU-C, and ECU-.
Equipped with D and ECU-E. These control each system such that the electronic control unit ECU-A is for engine control, the electronic control unit ECU-B is for AT control, the electronic control unit ECU-C is for chassis control, and the like. Further, each electronic control device can exchange data via the communication line 2 inside the vehicle, and can connect the vehicle failure diagnosis device 4 outside the vehicle via the communication line 2 on the vehicle side and the diagnostic connector 3. is there. Vehicle failure diagnosis device 4
Can display information for diagnosis on the screen of the display 5.

FIG. 2 shows the relationship between the electronic control devices on the transmitting side and the receiving side and the message IDs exchanged between them when exchanging data (messages) between the electronic control devices in the vehicle. The message ID is transmitted in the form of being included in the data (message), and constitutes specific data for specifying the electronic control device that has output the data (message) to the communication line 2. In the figure, the names of the electronic control devices on the data transmission side are shown in the leftmost columns arranged in the vertical direction.
The names of the electronic control units on the data receiving side are shown in the columns arranged in the uppermost horizontal direction.

First, the transmission side will be described. The electronic control unit ECU-A sends a message having a message ID of A1 and a message having a message ID of A2 onto the communication line 2 at predetermined time intervals, for example, every 20 msec. Send. Further, the electronic control unit ECU-
B transmits a message having a message ID of B1 and a message having a message ID of B2 on the communication line 2 every predetermined time, for example, every 30 msec.

Similarly, the electronic control unit ECU-C is
With the message ID C2, the message with the message ID C2, the electronic control unit ECU-D with the message ID D1, and the electronic control unit ECU-E with the message E1.
The message having the message ID is transmitted at a predetermined time corresponding to each message.

On the other hand, on the receiving side, the electronic control unit ECU-
A is a message I of B1, C1, C2, D1, and E1.
It is programmed to only work with messages with D and uses these captured data for its own control. Further, the electronic control unit ECU-B has A1, A
Only the messages having the message IDs of 2, C1, D1, and E1 are fetched and used for own control. Similarly, the electronic control unit ECU-C sends only messages having message IDs A1, B1, and E1, and the electronic control unit ECU-D sends messages having message IDs A1, B1, B2, C1, and E1. Also, the electronic control unit ECU-E has A1, A2, B1, B2, C1, C2,
The message IDs having the respective message IDs of D1 are respectively fetched and used for their own control.

The vehicle failure diagnosis device 4 has an internal structure shown in FIG.
It has the database shown in. That is, the vehicle failure diagnosis device 4 corresponds to all systems A, B, C, D, E, F, ... Which may be installed in various vehicles, as shown in FIG. For A, A1, A
Message IDs such as 2, A3, A4, ..., and for system B, B1, B2, B3, B4, ...
., Message IDs such as C1, C2, C3, C4, ... for system C, and D1, D2, D3, etc. for system D
Message IDs such as D4, ..., Message IDs such as E1, E2, E3, E4, ... for system E, and F1, F for system F.
It has a database in which message IDs such as 2, F3, F4, ... Are constructed.

Therefore, by comparing the message ID read from the communication line 2 by the vehicle failure diagnosis device 4 with its own database, it becomes possible to identify the on-vehicle electronic control device. This identification is executed according to a program in the vehicle failure diagnosis device 4.

Next, the operation of the vehicle failure diagnosis device will be described. First, the vehicle failure diagnostic device 4 is connected to the diagnostic connector 3 on the vehicle 1 side. After connection, the ignition switch (not shown) is turned on, and then the start button of the vehicle failure diagnosis device 4 is pressed. As a result, the vehicle failure diagnosis device 4 is activated.

The vehicle failure diagnosis device 4 identifies the on-vehicle electronic control device based on the flowchart of FIG.
First, in step 11, after pressing the start button, 2se
Message ID on communication line 2 in vehicle 1 during c
Are monitored to store their detected message IDs. Then, in step 12, among the message IDs stored in step 11, A1, A2, A3, ...
-Determine whether or not exists, and if they exist, go to step 13, and if they do not exist, step 14
Go to. In step 13, A1, A2, A3, ...
Since it is confirmed that any one of the above is present, it is determined that the system A is installed in this vehicle, "SYSTEM A" is displayed on the screen of the display 5, and the process proceeds to step 14.

In step 14, among the message IDs stored in step 11, B1, B2, B3, ...
Is present, the process proceeds to step 15 if they exist and to step 16 if they do not exist. In step 15, B1, B2, B3, ...
Since it has been confirmed that any one of the above is present, it is determined that the system B is installed in this vehicle, and “System B” is displayed on the screen of the display 5. Although omitted from this point onward, similarly perform the step of determining whether or not a predetermined ID of the message IDs exists and displaying that the corresponding system exists, if any, for all systems. To do.

FIG. 5 shows a screen display example of the identified final result on the display 5. That is, five system names such as system A "," system B "," system C "," system D ", and" system E "are displayed on the screen. This makes it possible for a worker who performs a failure diagnosis to recognize that one system is installed.

The transmission interval of the message including the above-mentioned message ID output from the electronic control unit on the vehicle side is predetermined at a predetermined interval according to the message ID, and is usually about 1 sec at the longest. That is, since the message sent from the electronic control unit is used to control the electronic control unit that receives the message, it is usually at least 1 sec.
The output is set to be output once during c. Therefore, the vehicle failure diagnosis device 4 can monitor all the messages at least once by monitoring the messages on the vehicle side for 2 seconds as in step 11.

Normally, as described above, 1 sec.
During this period, all electronic control units send messages, so if you monitor for 1 second, you will be able to receive messages from all in-vehicle electronic control units.
There is a possibility that the in-vehicle electronic control device may be erroneously determined due to poor reception due to noise or the like. For this reason, in this embodiment, by setting the time to be 2 seconds, it is possible to monitor twice so that the reliability is greatly improved. Further, since steps 12 to 15 are software processing inside the vehicle failure diagnosis device 4, they can be processed at the msec level. As a result, in the present embodiment, the identification of the on-vehicle electronic control device and its system name are completed in about 2 sec. Display is enabled.

When a communication failure occurs in a certain electronic control unit due to a disconnection of a communication line or the like, the system of the electronic control unit is installed in the vehicle only by the first identification method described above. There is a risk that it will be determined that it is not. Therefore, in the present embodiment, the fact that a communication failure has occurred can be determined and displayed on the display.

For example, even though the electronic control unit ECU-B is mounted, as a result of identifying the vehicle-mounted electronic control unit by the above-mentioned method, it is possible that the communication failure occurs due to the disconnection of the communication line or the like. A case where it is determined that the control device ECU-B is not mounted on the vehicle will be described as an example. As shown in FIG. 2, the electronic control unit of each system has a predetermined message ID.
Are programmed to capture messages with. For example, the electronic control unit ECU-A has B1, C
It is set to capture a message having each message ID of 1, C2, D1, and E1.

If the message having the message ID cannot be received for a certain period of time, for example, 1 sec, the receiving electronic control unit
It is configured to store the code of the self-diagnosis result (communication failure identification data) in its own memory (storage means) not shown in the figure, assuming that the communication with the electronic control device transmitting the message is defective. That is, the electronic control unit ECU-
If the message ID of B1 cannot be received, A is programmed in advance so as to store communication failure identification data, which means “communication failure from electronic control unit ECU-B”, in the memory of the electronic control unit ECU-A. Has been done.

Based on the above, the vehicle failure diagnosis device 4 executes the first identification method according to the flow of FIG. 4 described above, and then further executes the second on-vehicle electronic control device according to the flowchart shown in FIG. Identify. That is,
Each system (in this case, system A, system C, system D, excluding system B) determined to be mounted in the vehicle by the first identification method is determined by this method.
The four electronic systems of the system E) are sequentially communicated with the electronic control unit.

In this communication, first, in step 31, a system A self-diagnosis result request signal is transmitted to the system A. In step 32, it is determined whether or not 1 second has elapsed from the transmission of the system A self-diagnosis result request signal. If 1 second has not elapsed, go to step 33. If 1 second has elapsed, step 3
Go to 4. In step 33, it is judged whether or not the self-diagnosis result is returned from the electronic control unit of the system A. If there is a reply, the process proceeds to step 34, and if there is no reply, the process returns to step 32.

In step 34, the electronic control unit E
Based on the self-diagnosis result returned from CU-A, it is determined whether or not there is “communication failure from electronic control unit ECU-B”. If it is determined that there is a communication failure, the process proceeds to step 35, "System B (communication failure)" is displayed on the screen of the display 5, and the system B is mounted on the vehicle, but communication failure occurs. Make it visible to operators of fault diagnosis.

On the contrary to the above, if it is determined in step 34 that there is no communication failure from the electronic control unit ECU-B, the process proceeds to step 36. In step 36, it is determined from the self-diagnosis result returned from the electronic control unit ECU-A whether or not there is "communication failure from the electronic control unit ECU-C". If it is determined that there is communication failure, step 37
Proceed to step 5 and display "System C (communication failure)" on the screen of the display 5 so that the operator of the failure diagnosis can recognize that communication failure has occurred even though the system C is installed in the vehicle. To

On the contrary, when it is judged at step 36 that there is no communication failure from the electronic control unit ECU-C, the routine proceeds to step 38. In step 38, it is judged from the self-diagnosis result returned from the electronic control unit ECU-A whether or not there is "communication failure from the electronic control unit ECU-D". If it is determined that there is communication failure, step 39
Proceed to step 5 and display "System D (communication failure)" on the screen of the display 5 so that the operator of the failure diagnosis can recognize that communication failure occurs even though the system D is installed in the vehicle. To

If it is determined in step 38 that there is no communication failure from the electronic control unit ECU-D, step 40
Go to. In step 40, the "electronic control unit ECU-" is selected from the self-diagnosis result returned from the electronic control unit ECU-A.
It is determined whether or not there is a communication failure from E. If it is determined that there is a communication failure, the process proceeds to step 41, "SYSTEM E (communication failure)" is displayed on the screen of the display 5, and the system E It is made possible for the operator of the failure diagnosis to recognize that a communication failure has occurred although the vehicle is mounted on the vehicle.

On the contrary, when it is determined in step 40 that there is no communication failure from the electronic control unit ECU-E, the communication based on the communication failure specifying data stored in the memory of the electronic control unit ECU-A is performed. The in-vehicle electronic control unit ECU identified after the defective in-vehicle electronic control unit has been identified
In order to identify the vehicle-mounted electronic control unit having the communication failure by the communication failure specifying data stored in the memory C, the process proceeds to step 42.

At step 42, a self-diagnosis result request signal is transmitted to the electronic control unit ECU-C of the system C, and the electronic control units sequentially having communication failure are transmitted in the same manner as in the case of the electronic control unit ECU-A. It is determined whether or not there is a communication failure specifying data stored in the memory in the electronic control unit ECU-C. If there is a communication failure electronic control unit, the system name and the communication failure are found. To the effect is displayed on the screen of the display 5. The identification work similar to the above is sequentially performed for each of the electronic control devices of the system D and the system E.

FIG. 7 shows a display example of the above diagnosis result. On the screen of the display 5, "system A", "system C", "system D", "system E", "system B"
"(Communication failure)" is displayed, and the fact that the five systems A to E are installed in the vehicle and that the system B is in a communication failure state can be recognized by the operator who performs the failure diagnosis. .

The time required to execute the second identification method is as follows. The vehicle failure diagnosis device 4 includes vehicle-mounted electronic control units ECU-A, ECU-C,
The self-diagnosis result request is transmitted to the ECU-D and the ECU-E, and the self-diagnosis result stored in the memory is received from each electronic control unit. In this process,
First, the time required to transmit a signal of a self-diagnosis result request message to the electronic control unit ECU-A is set at a communication speed of 50.
If 0 kbps, about 100 bi per message
Since it is equivalent to t, it is about 0.2 msec. The subsequent processing time in the electronic control unit ECU-A takes a maximum of 1 sec because the vehicle failure diagnosis device 4 waits for reception of the self-diagnosis result for a maximum of 1 sec.

It takes about 0.2 msec to receive the self-diagnosis result message from the electronic control unit ECU-A, and the waiting time before the signal of the self-diagnosis result request message is transmitted to the electronic control unit ECU-C. , 60msec
Therefore, as a whole, (0.2 + 1000 + 0.
2 + 60) × 3 + (0.2 + 1000 + 0.2) = 41
It becomes 81.6 msec. Therefore, at worst, 5se
Electronic control units ECU-A, ECU-C, ECU within c
The self-diagnosis result can be read from each memory of -D and ECU-E. As a result, after the first identification method is executed, the second identification method is executed to determine whether or not there is a communication failure in the on-vehicle electronic control device and their communication, and even if these results are displayed on the display 5. It will only take about 7 seconds.

As described above, in the vehicle failure diagnosis apparatus according to the present embodiment, first, the message signal having the message ID output from each electronic control unit is read on the communication line 2 on the vehicle side, Since the vehicle-mounted electronic control device is identified by the first identification method in which the message ID is compared with the database of the relationship between the electronic control device on the sending side and the receiving side and the message ID, the electronic control device on the vehicle is identified. The time required for identifying and displaying the corresponding system name on the screen of the display 5 can be shortened as compared with the conventional vehicle failure diagnosis device that requires a long waiting time. As a result, the efficiency of the diagnostic work is improved.

Further, by the second identification method of reading the information of the self-diagnosis result stored in the memory in the electronic control device identified by the first identification method, all the on-vehicle electronic devices are irrespective of the presence or absence of communication failure. It is possible to identify the control device, detect the presence or absence of communication failure, and display the different forms on the display 5. The time required for this identification and display can be greatly shortened as compared with the conventional vehicle failure diagnosis device, and the efficiency of the failure diagnosis work can be improved.

As a result, it is determined that the system does not exist even though the system is mounted on the vehicle due to a communication failure due to a broken communication line and the system name is not displayed on the display screen. Also, there is no fear of causing confusion of workers and deterioration of efficiency of failure diagnosis work.

The present invention is not limited to the above embodiment, but can be implemented in various modes. For example, if the electronic control unit ECU-B is mounted on the vehicle and communication is poor, the electronic control units ECU-A, ECU-C, ECU-D,
When each ECU-E sends a self-diagnosis result of "communication failure from electronic control unit ECU-B",
Instead of collectively displaying the same contents as one as shown in FIG. 7, all four diagnostic results may be displayed as “system B (communication failure)”.

Alternatively, "system B (communication failure: system A judgment)", "system B (communication failure: system C)"
Judgment) "," System B (communication failure: System D judgment) "," System B (communication failure: System E judgment) "
For example, four types of system names for which communication failure is determined may be displayed together.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of data exchange between electronic control devices.

FIG. 3 is a diagram showing an example of a database in a vehicle failure diagnosis device for identifying an electronic control device.

FIG. 4 is a first flowchart for identifying an electronic control unit.

FIG. 5 is a diagram showing a display example of an identification result on a display.

FIG. 6 is a second flowchart for electronic control unit identification.

FIG. 7 is a diagram showing a display example of an identification result on a display.

FIG. 8 is a flowchart for identifying an electronic control device in a conventional example.

[Explanation of symbols]

1 vehicle 2 communication lines 3 Diagnostic connector 4 Vehicle failure diagnosis device ECU-A, ECU-B, ECU-C Electronic control device ECU-D, ECU-E Electronic control device

Claims (4)

[Claims] 1. A plurality of electronic devices mounted on a vehicle, each of which is connected by a communication line, and outputs control data to the communication line to perform data communication with each other via the communication line to control respective controlled objects. A failure diagnosis device for a vehicle, which is connected to a control device through the communication line and performs a failure diagnosis of the plurality of electronic control devices, the electronic control device including the control data output to the communication line, respectively. The electronic control device mounted on the vehicle based on the specific data identifying the electronic control device that has output the control data, and the electronic device is mounted on the vehicle by the identifying means. A failure diagnosis device for a vehicle, which performs a failure diagnosis of the identified electronic control device. 2. The plurality of electronic control devices each have a communication failure that specifies an electronic control device that outputs the control data that could not be received when the control data that was output from another electronic control device could not be received. The communication means includes storage means for storing device identification data, and the identification means stores the communication failure device identification data recorded in the storage means of the electronic control device identified as being installed in the vehicle based on the identification data. The fault diagnosis device for a vehicle according to claim 1, wherein the faulty communication control device for a vehicle is identified based on the read communication failure device identification data. 3. The informing means for informing the information for identifying the electronic control device which is identified as being mounted on the vehicle by the identifying means, according to claim 1 or 2. Vehicle failure diagnostic device. 4. The notifying unit electronically based on information specifying the electronic device identified as being mounted on a vehicle based on the specifying data, and communication failure device specifying data read from the storage unit. The vehicle failure diagnosis device according to claim 3, wherein the information specifying the control device is notified in a different form.