JPH09250970A - Fault diagnostic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the safety by preventing the fault due to the execution of diagnosis items required for security by an improper operator. SOLUTION: When a cursor is matched to the item of '8. Special operation' of a vehicle fault diagnosis menu and a 'Y' key is pressed, a message for requesting a password input is displayed on a display, a password input queue. At this time, when the password is input, whether the password matches the password already registered or not is checked. In the case of matching, the message of the matching of the password is displayed on the display, then the menu of the operation required for security is displayed, the item of the object is selected to the executable state. Thus, even if the item required for the security is selected, the operation of the menu cannot be conducted except the parties concerned for registering the password or the person entrusted for the operation by teaching the password to prevent the careless operation required for the security.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosis device for reading out data in an electronic control unit mounted on a vehicle and performing a failure diagnosis.

[0002]

2. Description of the Related Art Recently, a control system for a vehicle such as an automobile is complicatedly electronically controlled, and at the time of failure diagnosis, a failure diagnosis apparatus capable of easily reading data from an electronic control apparatus mounted on the vehicle. Equipment is essential.

Examples of this type of failure diagnosis device include:
There is a portable failure diagnostic device which attaches importance to versatility disclosed in Japanese Patent Publication No. 7-76737 by the present applicant,
A memory cartridge having a built-in storage medium that stores a diagnostic program corresponding to the vehicle type or year is made replaceable with the main body of the failure diagnosing device, and data communication with the electronic control device of the vehicle enables the electronic control device to be installed in the electronic control device. By reading the data of, the maintenance staff can easily check the control system of the vehicle.

[0004]

SUMMARY OF THE INVENTION The above-described failure diagnosis apparatus is intended to facilitate vehicle failure diagnosis without requiring advanced knowledge and abundant experience. Among them, there are items that require security, such as a key lock release operation of a vehicle having an infrared interface key lock system, a vehicle ID writing operation, or a failure diagnosis of a throttle system or a vehicle speed detection system.

Originally, these security-requiring operations are to be performed only by those who have sufficient knowledge and experience and have appropriate qualifications, and those who are not qualified inadvertently perform the operations using the above-mentioned failure diagnosis device. Unexpected trouble may occur.

The present invention has been made in view of the above circumstances, and provides a failure diagnosis device capable of preventing the occurrence of a malfunction by an improper operator performing a diagnostic item requiring security and ensuring safety. It is intended to be provided.

[0007]

According to the first aspect of the present invention,
In a failure diagnosis device that is connected to an electronic control device mounted on a vehicle and reads data in the electronic control device for failure diagnosis, as shown in the basic configuration diagram of FIG. Password discriminating means for discriminating whether or not it coincides with pre-registered data, and when the password discriminating means discriminates that the input data of the password coincides with pre-registered data, execution of a preset processing item And an execution permitting means for permitting the execution.

According to a second aspect of the present invention, there is provided a failure diagnosing apparatus which is connected to an electronic control unit mounted on a vehicle and reads out data in the electronic control unit to perform a failure diagnosis.
As shown in the basic configuration diagram of (b), an item selecting unit that selects an item to be executed in accordance with an operation input from a plurality of processing items, and an item selected by the item selecting unit requires a password. Password required item discrimination means for discriminating whether or not, password discrimination means for discriminating whether or not the input data of the password matches the data registered in advance, and the input data of the password is registered in advance by the password discrimination means. When it is determined that the data matches the specified data,
And an execution permitting unit that permits execution of the item requiring the password.

According to a third aspect of the present invention, there is provided a failure diagnosing device which is connected to an electronic control device mounted on a vehicle and reads data in the electronic control device to perform a failure diagnosis.
As shown in the basic configuration diagram of (c), the password input permission means for permitting the password input by the preset specific operation input and the data by the password input permitted by the password input permission means are registered in advance. When the password discriminating means for discriminating whether or not it matches a certain data and the data inputted by the password for the password discriminating means coincides with the data registered in advance, the preset processing item can be executed by the operation input. It is characterized in that it is provided with an execution permission means for setting the status.

That is, according to the first aspect of the invention, it is determined whether or not the input data of the password matches the data registered in advance, and only when it is determined that they match.
Permit execution of preset processing items.

According to the second aspect of the invention, it is determined whether or not the item to be executed selected from the plurality of process items in response to the operation input is an item requiring a password. Then, when a password is required, it is determined whether the input data of the password matches the data registered in advance,
Only when it is determined that they match, the execution of the item requiring the password is permitted.

According to the third aspect of the present invention, the password input is permitted by a preset specific operation input, and it is determined whether or not the data input by the password matches the data registered in advance. Then, when it is determined that the data input by the password matches the data registered in advance, the preset process item is set to the executable state by the operation input.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 13 relate to the first embodiment of the present invention, FIGS. 2 and 3 are main part flowcharts of a menu processing routine, FIG. 4 is a flowchart of a throttle system failure diagnosis routine, and FIG. 5 is a select monitor menu screen. , FIG. 6 is an explanatory view of a vehicle failure diagnosis menu screen, FIG. 7 is an explanatory view of a screen for requesting a password input, and FIG. 8 is an explanatory view of a screen for displaying a password match,
FIG. 9 is an explanatory view of a screen prompting confirmation of engine stop, FIG.
Is an explanatory view of the screen that shows that the diagnostic result is normal,
11 is an explanatory view of a screen displaying that the diagnosis result is abnormal, FIG. 12 is a circuit block diagram of the vehicle-mounted electronic control device and the failure diagnosis device, and FIG. 13 is a diagram of the failure diagnosis device connected to the vehicle-mounted electronic control device. It is an external view.

In FIG. 13, reference numeral A is a portable failure diagnosing device (hereinafter referred to as a select monitor) which is connected to an electronic control unit C mounted on a vehicle B such as an automobile to carry out a failure diagnosis. This select monitor A has a general-purpose interface that can be connected to various in-vehicle electronic control units, regardless of the vehicle model or the vehicle manufacturer, and also measures the voltage, resistance, pulse signal, etc. in addition to the base function for failure diagnosis. It has abundant expansion functions such as measurement function for wired communication, wired communication, wireless communication, optical communication, etc. to computer, and expansion function of data memory. It is designed to select a process.

Therefore, the select monitor A has, on the front surface thereof, a display 30 composed of a liquid crystal display with a backlight, an indicator section 31 composed of a plurality of LEDs, etc., and "S" arranged vertically and horizontally on diagonal lines.
"C", "Y", "N" keys, "←", "→", "↑", "↓" keys for moving the cursor vertically and horizontally, and F1 to F1 in the lower row. A keyboard 32 whose function can be changed according to the application based on the function key of F4 is provided, and a memory cassette 50 described later is attached to the side portion.

The electronic control unit C mounted on the vehicle B
When diagnosing the failure of, the diagnostic connector 33 provided on the select monitor A is connected to the external connector 2a of the electronic control unit C via the diagnostic cable 34 as shown in the drawing, and the power switch ( By turning on (not shown) and selecting a desired item from the menu displayed on the display 30 with the keyboard 32, failure diagnosis of each part can be easily performed.

On the other hand, the electronic control unit C mounted on the vehicle B includes those related to powertrain control such as an engine and an automatic transmission, those related to body control such as an air conditioner and various information systems, suspensions and auto cruises. In the present embodiment, an example in which an engine control unit (ECU) 2 that controls the engine is a failure diagnosis target will be described.

As shown in FIG. 12, the ECU 2 is a ROM in which fixed data such as a CPU 3 as a main arithmetic unit, an engine control program and various maps is stored.
4, RAM5 that stores the data after processing the output signals of various sensors and switches and the data that has been processed, the input interface 6 that inputs the signals from various sensors and switches, the control signals for various actuators, etc. A constant voltage circuit 8, which supplies a constant voltage to each part, is constituted by a microcomputer whose output interface 7 for outputting is connected to each other via a bus line.
Peripheral circuits such as a drive circuit 9 for driving actuators in accordance with a signal from the output interface 7 are incorporated.

As the data input through the input interface 6, the cooling water temperature signal detected by the cooling water temperature sensor 10, the lean / rich signal of the air-fuel ratio detected by the O2 sensor 11, and the intake air amount sensor 12 are measured. Intake air amount signal, air conditioner switch 13 ON / OFF signal,
Vehicle speed signal detected by vehicle speed sensor 14, ON / OFF signal of idle switch 15, throttle opening signal detected by throttle opening sensor 16, neutral switch 1
7 is an ON / OFF signal, an engine speed signal detected by the engine speed sensor 18 and the like. Each input data of these is processed by the CPU 3 and temporarily stored in the RAM 5 to be used for calculation of the control amount. . That is, C
The PU 3 calculates various control amounts such as the fuel injection pulse width and the ignition timing based on each data stored in the RAM 5, and outputs a control signal corresponding to the control amount from the output interface 7 to the drive circuit 9 To a predetermined timing.

In the drive circuit 9, a canister controller 19 for controlling the canister purge amount, a throttle actuator 20 for controlling the throttle opening, an idle control actuator 21 for controlling the idle speed, and a high voltage is applied to the ignition plug. An ignition coil 22, an injector 23 for injecting fuel, and the like are connected and driven by a control signal from the output interface 7 to control the engine to an optimum state for each operating region.

Further, in the drive circuit 9, when an abnormality in the system is detected by the self-diagnosis function, the RO
A self-diagnosis lamp 24 for displaying a trouble code corresponding to the failed part read from M4 by, for example, appropriately lighting a plurality of lamps or blinking a predetermined number of times is connected.

It should be noted that a part of the RAM 5 is a backup RAM that retains data by being supplied with power from the battery VB via the constant voltage circuit 8 even after the system power is turned off. Learning value by control,
A trouble code or the like corresponding to the failed part detected by the self-diagnosis function is stored.

Next, the basic structure of the select monitor A excluding the extended function will be described. This select monitor A
Is a dealer's service factory or the like, and has a power supply circuit 36 for supplying a constant voltage to each unit, including a main control unit 35 including a microcomputer and the power switch therein.
Etc. are provided. Also, a removable memory cassette 50 is connected to the main controller 35 via a cassette connector 37 so as to be externally replaceable.

In the power supply circuit 36, the battery VB of the vehicle B is connected via a cigarette lighter cable, or the general AC power supply is connected via an AC / DC adapter.
Alternatively, by incorporating a battery, power can be supplied, and so-called three power sources are supported.

The main control unit 35 has a CPU 40, which is a main processing unit, a ROM 41 storing data such as a system boot program and menus displayed on the display 30 and various messages, a work RAM storing video data, a video RAM, etc. RAM 42, a diagnostic interface 43 that is a connection interface with the vehicle-mounted electronic control unit C, lighting (or blinking) of the LED of the indicator unit 31, a key operation signal from the keyboard 32, and a display signal to the display 30. The input / display interface 44 for processing and the ROM 51 provided in the memory cassette 50 are connected via a bus line.

The diagnostic interface 43 is an FPGA (Field Programmable Gate) whose on-board logic function can be reprogrammed by giving design information.
Array), and with this FPGA,
To realize hardware of an I / O interface that can be connected to various in-vehicle electronic control devices C regardless of vehicle type and completed vehicle maker, and a serial communication interface that conforms to communication protocols of various in-vehicle electronic control devices C. You can Regarding the diagnostic interface centering on the above FPGA, Japanese Patent Application No. 6-2753 filed by the present applicant.
No. 49.

In addition, the memory cassette 50 has various functions such as different diagnostic items, different vehicle types, and different communication protocols.
The select monitor A is used for general purpose, and the FPGA is reconfigured so as to be compatible with the diagnostic processing program corresponding to the in-vehicle electronic control unit C and the communication protocol of the in-vehicle electronic control unit C. Design data and the like including logic information and the like for programming are stored in the ROM 51.

At the time of failure diagnosis, in order to reprogram the diagnostic processing program corresponding to the on-vehicle electronic control unit C (the ECU 2 whose engine is the control target in this embodiment) and the FPGA of the diagnostic interface 43. The memory cassette 50 storing the design data and the like is installed, the design data of the FPGA stored in the ROM 51 is transferred to the diagnostic interface 43 together with the initialization of the select monitor A, and the FPGA is reprogrammed to be mounted on the electronic vehicle. The I / O connection and serial communication with the control device C are made possible.

The design data of the FPGA constituting the diagnostic interface 43 is not necessarily limited to that stored in the ROM 51 in the memory cassette 50. For example, the boot program of the CPU 40 may be changed to change the external computer. The FPGA design data may be loaded from.

As described above, the failure diagnosis by the select monitor A is basically a hierarchical menu system, and the failure diagnosis can be easily performed by selecting the menu without requiring advanced knowledge and experience. It is possible, but with a sufficient knowledge and experience, a proper qualification, such as unlocking the key of a vehicle that has a key lock system with an infrared interface, writing the vehicle ID, or diagnosing a failure in the throttle system or vehicle speed detection system. For tasks requiring security that only those who have
Security is ensured by providing a password protection function by the functions of the item selection means, the password required item determination means, the password determination means, and the execution permission means.

That is, in the menu of the select monitor A, there is an item that can be executed only after the password is input. Hereinafter, in the menu selection process of the select monitor A, the processing portion requiring the password will be described with reference to FIG. And it demonstrates according to the flowchart of FIG.

First, when the select monitor A equipped with the memory cassette 50 suitable for the ECU 2 of the vehicle B to be diagnosed is connected to the ECU 2 via the diagnostic cable 34 and the power switch is turned on, the system of the select monitor A is switched on. The controlling CPU 40 is reset, and the processing shown in FIGS. 2 and 3 starts.

In this process, first, in step S101, the system is initialized. In step S102, the screen data of the select monitor menu, which is the initial menu screen, is transferred from the memory table of the menu screen data to the video R.
The data is transferred to the AM and the select monitor menu is displayed on the display 30 as shown in FIG. In FIG. 5, the select monitor menu is a top-level menu consisting of a menu of 8 items including extended functions, and the contents registered in the function keys F1 to F4 are displayed at the bottom of the screen.

The function keys F1 to F4 are initially assigned, for example, a command to return to the initial screen, a command to return to a menu in the next higher hierarchy, a reset command, and an end command. Therefore, it is possible to easily move to a screen in a desired state by pressing the corresponding function key regardless of the hierarchy of the menu screen or the screen being processed.

While looking at this menu screen, the operator moves the cursor up and down by using the "↑" and "↓" keys of the keyboard 32, and when the cursor is aligned with the desired menu item and highlighted, " If you press the "Y" key,
The selection is confirmed and the next level menu is displayed. In this case, the select monitor menu has a password function item, and by moving the cursor to the line "8. Password function" and pressing the "Y" key, a menu screen for password registration, change, etc. is displayed. To be done. And
Further, when the cursor is aligned with the target item and the "Y" key is pressed, the selection is confirmed and a predetermined input screen is displayed. For example, the password is registered by the alphabet or number assigned to each key of the keyboard 32. And so on. Here, the description will proceed assuming that the password has already been registered.

After the selection monitor menu is displayed in step S102, the "↑" and "↓" keys are awaited for input. When the "↑" key or "↓" key is input, the cursor moves sequentially after the key input. And the cursor position is examined. This cursor position is
For example, the position is “1. Check all diagnostic codes” on the first line, and as shown in FIG. 5, the cursor is moved to “2. Step S1 for checking whether or not the cursor position is on the second line when the item "Fault diagnosis" is selected
When it reaches 04, the process proceeds from step S104 to step S105.

In step S105, it is checked whether or not the key code by the key input is YES, and when the key code is YES, that is, when the "Y" key is selected,
In step S106, the screen data of the vehicle failure diagnosis menu is selected from the memory table of the menu screen data, transferred to the video RAM, and the vehicle failure diagnosis menu is displayed on the display 30.

In the vehicle failure diagnosis menu, as shown in FIG. 6, in addition to items 1 to 7 that can be diagnosed by general workers, there is an eighth special work requiring security, which is sequentially performed from step S106. When the cursor is moved to the item of “8. Special work” through the step of checking the cursor position, and when it reaches step S114 which checks whether or not the position of the cursor is on the 8th line, the key code is YES from step S114. The process proceeds to step S115 to check whether or not it is.

When the "Y" key is pressed to proceed from step S115 to step S116, a message as shown in FIG.
Is displayed, and the process waits for the password input to check whether the password is input in step S117. At this time, when the worker looks at the password input request screen of FIG. 7 and inputs the password, the process exits the password input waiting loop of step S117 and proceeds to step S118, where the entered password matches the already registered password. Check whether to do.

As a result, when the input password data does not match the registration data, the process returns to step S106 for displaying the vehicle failure diagnosis menu. When the input password data matches the registration data, step S1
In step 19, the message showing that the passwords match is displayed on the display 30 as shown in FIG. 8, and the process proceeds to the next step.

That is, even if a special work requiring security in the vehicle failure diagnosis menu is selected, the work of this menu can be performed by anyone other than the person who has registered the password in advance or the person who has been given the password and given the work. This prevents users from performing careless work unnecessarily.

After that, the above steps S119 to S1
Proceed to 20, select the screen data of the special operation menu from the memory table, and display the menu such as the release of the infrared key lock system, the writing of the vehicle ID, the failure diagnosis of the throttle system, the failure diagnosis of the vehicle speed detection system, etc. . Then, through the steps similar to those described above for selecting the desired item from step S120, the process proceeds to step S125,
When the processing program of the selected item is selected, the processing program is executed in step S126.

After completion of the program in step S126, step S1 for displaying the special work menu again.
Return to 20. Here, when another work is performed from the current special work menu screen, another processing item is selected again by the same operation and the vehicle failure diagnosis menu of the previous hierarchy is returned to, for example, To return to the initial select monitor menu by pressing the F2 key, for example, press the F1 key.

Of the special work requiring security, for example, the process in step S126 when the failure diagnosis of the throttle system is selected will be described with reference to the flowchart of FIG.

When the throttle system failure diagnosis is selected and the throttle system failure diagnosis routine is executed, first, in step S201, a message prompting confirmation of engine stop is displayed as shown in FIG. 9, and step S202 Then, it is checked whether or not the "Y" key has been input. Then, confirm the engine stop according to the message on the screen and press the “Y” key to proceed from step S202 to step S204 or later. If the “Y” key is not pressed, proceed to step S202 to step S203 to input. It is checked whether or not the waiting time limit is exceeded, and as long as it is within the time limit, the process returns to step S202 and the loop is repeated. When the time limit is exceeded, a timeout occurs and the routine exits.

When the input of the "Y" key is confirmed in step S202, and the process proceeds to step S204, the command from the select monitor A to the ECU 2 via the diagnostic interface 43 to drive the throttle actuator 20 to fully close the throttle valve. To send. When the throttle actuator 20 is driven by the ECU 2 and the throttle valve is fully closed, in step S205, the select monitor A sends a command requesting the output value of the throttle opening sensor 16 to the ECU 2, and the ECU 2 responds. Throttle opening sensor value VC sent when the throttle is fully closed
Read.

Next, in step S206, the select monitor A sends a command to the ECU 2 to drive the throttle actuator 20 to open the throttle valve at a half intermediate opening between full closing and full opening. When the opening degree reaches the middle, in step S207, the selection monitor A to the ECU
2, a command requesting the output value of the throttle opening sensor 16 is transmitted, and the throttle opening sensor value VH at the time of the middle opening of the throttle returned from the ECU 2 is read.

Further, the above steps S207 to S2
In step 08, the select monitor A sends a command to the ECU 2 to drive the throttle actuator 20 to fully open the throttle valve. Then, when the throttle actuator 20 is driven by the ECU 2 and the throttle valve is fully opened, in step S209, the select monitor A
Transmits a command requesting the output value of the throttle opening sensor 16 from the ECU 2 to read the throttle opening sensor value VO when the throttle is fully opened, which is returned from the ECU 2, and proceeds to step S210.

In step S210, the throttle opening sensor output value VC when the throttle is fully closed, the throttle opening sensor output value VH when the throttle is open, and the throttle opening sensor output value VO when the throttle is fully open are within the standard. And if each is within the criteria, step S2
10, the message indicating that the throttle system is normal is displayed on the display 30, as shown in FIG. 10, and the routine exits.

On the other hand, in step S210, any one of the throttle opening sensor output value VC when the throttle is fully closed, the throttle opening sensor output value VH when the throttle is open, and the throttle opening sensor output value VO when the throttle is fully open. If it is not within the standard and is abnormal, the process proceeds from step S210 to step S212, and a message indicating that the throttle system is abnormal, for example, the throttle opening sensor output value VO when the throttle is fully open does not reach the standard. Sometimes, a message as shown in FIG. 11 is displayed on the display 30.
Is displayed on the screen to prompt the operator to readjust or check the throttle system, and exit the routine.

As described above, it is possible to prevent an unqualified person from inadvertently performing a work requiring security, prevent a trouble from occurring, and ensure safety.

14 and 15 relate to the second embodiment of the present invention, FIG. 14 is a partial flowchart of a menu processing routine, and FIG. 15 is an explanatory view of a vehicle failure diagnosis menu screen before password input.

In this embodiment, the first embodiment described above includes a processing item requiring security in the normal menu display,
While this security-required processing item is selected by password input, the password input permission means, password discrimination means, and execution permission means functions enable the selection of a processing item that requires security only when the password input data matches the registered data. The display is made selectable, and the processing item itself requiring security is hidden from the operator who does not know the password.

Therefore, in this embodiment, the configuration of the menu screen and the process of the menu processing are slightly changed from those of the first embodiment described above, and the second vehicle system from the select monitor menu on the initial menu screen shown in FIG. When the failure diagnosis is selected, the vehicle failure diagnosis menu becomes a menu screen (see FIG. 15) excluding the item of the eighth special work from the menu screen shown in FIG.

That is, in the menu processing routine, when the cursor is moved to the line "2. Vehicle system failure diagnosis" of the select monitor menu and the "Y" key is pressed, steps S105 to S301 shown in FIG. 14 are performed.
Then, the vehicle failure diagnosis menu is displayed on the display 30, and in step S302, a key input waiting loop for password input is entered.

As shown in FIG. 15, the vehicle failure diagnosis menu displayed in step S301 is a standard menu consisting of only items that can be performed by a general worker, and when performing special work requiring security, enter a password. It is necessary to perform special key operations to enable this. This key operation is preset so as to mean the password input by pressing two specific keys at the same time. For performing a special work, for example, the "S" key and the "↑" key are pressed at the same time. Then, the process proceeds from step S302 to step S303 and is interpreted as a password input request,
In step S304, the input of a password is awaited.

Here, when the operator inputs the password, the process exits the password input waiting loop of step S304 and proceeds to step S305 to check whether the input password matches the already registered password. As a result, when the input password data does not match the registration data, the process returns to step S301 which displays the standard vehicle failure diagnosis menu. When the input password data matches the registration data, step S306
Proceed to step 3 and display the extended vehicle failure diagnosis menu that adds special work items to the standard vehicle failure diagnosis menu 3
Display at 0. That is, in the present embodiment, the same menu as the vehicle failure diagnosis menu of FIG. 6 in the above-described first embodiment is not provided until the input data of the password matches the registration data.

Then, when the cursor is moved to the item "8. Special work" in the extended vehicle failure diagnosis menu and the "Y" key is pressed, the cursor position is changed to 8 from step S306.
The process goes to step S315 to check whether it is the line
Step S3 for checking whether the key code is YES from S315
After step 16, the process proceeds to step S317, and like the first embodiment described above,
The display 30 displays menus such as release of the infrared key lock system, writing of vehicle ID, throttle system failure diagnosis, and vehicle speed detection system failure diagnosis.

After step S317, similarly to the above-described first embodiment, the process proceeds from step S317 to the step of selecting the target item, and then proceeds to step S320. When the processing program of the selected item is selected, the program is executed in step S321. After the execution and the processing, the process returns to step S317 for displaying the special work menu again.

In this embodiment, the existence of the processing item requiring security can be hidden from an unsuitable worker, and a stronger protection function can be provided.

[0061]

As described above, according to the present invention, since a password protection function is provided for a diagnostic item requiring security, an improper worker may inadvertently perform a work, thereby causing a problem. Excellent effects such as prevention and safety can be obtained.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a main part flowchart of a menu processing routine according to the first embodiment of the present invention (part 1).

FIG. 3 is the same as the above, a main part flowchart of the menu processing routine (part 2)

FIG. 4 is a flow chart of a throttle system failure diagnosis routine.

[FIG. 5] Same as above, an explanatory view of a select monitor menu screen

FIG. 6 is an explanatory diagram of a vehicle failure diagnosis menu screen as above.

FIG. 7 is an explanatory diagram of a screen requesting a password input as above.

FIG. 8 is an explanatory diagram of a screen for displaying the password agreement, as above.

FIG. 9 is an explanatory diagram of a screen prompting confirmation of engine stop as above.

FIG. 10 is an explanatory diagram of a screen displaying that the diagnosis result is normal.

FIG. 11 is an explanatory diagram of a screen for displaying that the diagnosis result is abnormal as above.

FIG. 12 is a circuit block diagram of the vehicle-mounted electronic control device and the failure diagnosis device.

FIG. 13 is an external view of a failure diagnosis device connected to the vehicle-mounted electronic control device.

FIG. 14 is a partial flowchart of a menu processing routine according to the second embodiment of the present invention.

FIG. 15 is an explanatory diagram of a vehicle failure diagnosis menu screen before a password is input, same as above.

[Explanation of symbols]

A ... Failure diagnosis device (password discrimination means, execution permission means, item selection means, password required item discrimination means, password input permission means) C ... Electronic control device

Claims (3)

[Claims] 1. In a failure diagnosis device which is connected to an electronic control device mounted on a vehicle and reads data in the electronic control device for failure diagnosis, input data of a password matches data registered in advance. A password discriminating means for discriminating whether or not the password discriminating means discriminates whether or not the input data of the password coincides with the data registered in advance, and an execution permitting means for permitting the execution of the preset processing item. A failure diagnosis device characterized in that 2. A failure diagnosis device, which is connected to an electronic control device mounted on a vehicle and reads data in the electronic control device to perform a failure diagnosis, in accordance with an operation input from a plurality of processing items. Item selecting means for selecting an item to be selected, password required item determining means for determining whether or not the item selected by the above item selecting means is an item requiring a password, and the input data of the password matches the data registered in advance. A password discriminating means for discriminating whether or not to execute, and an execution permitting means for permitting execution of the item requiring the password when the password discriminating means discriminates that the input data of the password matches the data registered in advance. A failure diagnosis device characterized by being provided. 3. A failure diagnosis device, which is connected to an electronic control device mounted on a vehicle and reads data in the electronic control device to perform a failure diagnosis, permits password input by a preset specific operation input. Password input permission means, password discrimination means for discriminating whether or not the data input by the password permitted by the password input permission means coincides with the data registered in advance, and data for password input by the password discrimination means When it is judged that it matches the data registered in advance,
A failure diagnosis apparatus comprising: an execution permission unit that sets a preset processing item to an executable state by an operation input.