JPH09257660A - Trouble shooting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively identify the present function by illuminating the keys of a key operating input unit by backlight, switching the key function in response to the selected input to the key for setting a plurality of functions, and altering the illuminating state of the key. SOLUTION: An indicator part 31 having a liquid crystal display 30 and a plurality of LEDs is provided at a front left side of a select monitor A, a keyboard 32 is provided at the front right side, and a memory cassette 60 is provided at the left side. When a shift key 49 for switching the functional mode of the key is pressed, the input is detected, the backlight illumination of the directional keys 45 to 48 is switched, for example, from green of normal mode to red. Thus, the switching of the functions of the keys 45 to 48 from the cursor vertical movement of the normal mode to numerical value input function can be easily recognized, thereby making it possible to prevent the erroneous operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure diagnosing apparatus for reading data in an electronic control unit mounted on a vehicle and diagnosing a failure of a control system of the vehicle including the electronic control unit.

[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,
Data in the electronic control unit of the vehicle can be read and displayed on the display by a simple key operation from the keyboard, so that the maintenance personnel can easily check the control system of the vehicle.

In such a portable fault diagnostic device, the man-machine interface such as a keyboard or a display is emphasized, and as a technique relating to the backlight of the display, for example, Japanese Patent Laid-Open No. 1-2378.
No. 10 publication discloses that when there is no key input for a certain period of time,
A technique for turning off the backlight of a display device is disclosed.

[0005]

In the portable fault diagnosis device as described above, since the number of keys is limited due to the limitation of the size of the keyboard, different functions are assigned to the same key, and the key function is assigned. If you try to select and operate, it will be difficult to distinguish the current function mode of the key.

For this reason, it is conceivable to display the function mode on the screen or turn on the light when the function mode of the key is switched by providing a lamp or the like on the main body, but the data display range of the screen is narrow. However, there is a problem in that the visibility is poor and an erroneous operation is caused.

The present invention has been made in view of the above circumstances, and it is possible to reliably identify the current function mode of a key to which a plurality of functions are assigned without reducing the display area of the diagnostic information. The purpose is to provide a device.

[0008]

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, reads data in the electronic control device by a key operation of a key operation input unit, and performs a failure diagnosis of a control system of a vehicle including the electronic control device, As shown in the basic configuration diagram of FIG. 1, a key input means for illuminating each key of the key operation input section with a backlight, and a selection input for a key of the key operation input section in which a plurality of functions are set in advance. Key function switching means for switching the key function according to the key function, and key lighting control means for changing the lighting state of the corresponding key by the key lighting means when the key function is switched by the key function switching means. Characterize.

According to a second aspect of the present invention, in the first aspect of the invention, the illumination state of the corresponding key is changed according to the illumination color or the brightness.

That is, according to the first aspect of the invention, when the key function is switched in response to the selection input of a key having a plurality of functions set in advance, the illumination state of the backlight of the corresponding key is changed to Make changes easy to identify. In this case, the illumination state of the backlight can be changed according to the illumination color or brightness as described in claim 2.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 11 show an embodiment of the present invention, FIGS. 2 and 3 are flowcharts of a menu processing routine, FIG. 4 is an explanatory diagram of a select monitor menu screen, and FIG. 5 is an explanatory diagram of a vehicle failure diagnosis menu screen. , Fig. 6
Is an explanatory diagram of a data display / memory menu screen, FIG. 7 is an explanatory diagram of a graph display setting menu screen, FIG. 8 is an explanatory diagram of an engine speed graph display screen, and FIG. 9 is an in-vehicle electronic control device and a failure diagnosis device. FIG. 10 is a circuit diagram of a key illumination drive circuit, and FIG. 11 is an external view of a failure diagnosis device connected to an on-vehicle electronic control device.

In FIG. 11, reference numeral A is connected to an electronic control unit C mounted on a vehicle B such as an automobile, and various data including input / output data in the electronic control unit C is read out by bidirectional communication to perform the electronic control. It is a portable failure diagnosis device (hereinafter, referred to as a select monitor) that performs a failure diagnosis on a control system of a vehicle B including a device C. The select monitor A has a general-purpose interface that can be connected to various in-vehicle electronic control devices C regardless of the vehicle type and the completed vehicle maker, and has a voltage diagnosis function in addition to a base function for failure diagnosis.
It has abundant expansion functions such as measurement function for measuring resistance, pulse signal, etc., wire communication, wireless communication, computer communication function such as optical communication, data memory expansion function, etc. Various processes are selected according to the structure menu method.

Therefore, the select monitor A is provided with a display 30 including a liquid crystal display with a backlight and an indicator portion 31 including a plurality of light emitting diodes on the left side of the front surface, and a key on the right side of the front surface. A keyboard 32 as an operation input unit is arranged, and a memory cassette 60 described later is attached to the left side portion.

The function of the keys of the keyboard 32 can be changed according to the purpose. As shown in FIG. 4, "↑", "↓", "→", "←" are displayed on the key tops of the individual keys. The direction keys 45, 46, 47, 48 displaying the symbol "" are arranged in the center, and the shift key 49 displaying the character "S" and the character "C" are arranged at the four upper and lower corners of the direction key. The displayed selection key 50, the yes key 51 with the letter "Y" displayed, and the no key 5 with the letter "N" displayed
2 are provided, and "F1", and
The key layout is such that the function keys 53, 54, 55, 56 displaying the letters "F2", "F3", "F4" are arranged. The device has a structure in which the illumination light from the light emitting device is transmitted and the illumination is performed by the backlight.

The electronic control unit C mounted on the vehicle B
In the case of reading the data in the inside and performing the failure diagnosis, as shown in FIG. 11, the diagnostic connector 33 provided in the select monitor A is connected to the external connector 2a of the electronic control unit C via the diagnostic cable 34. By turning on the power switch (not shown) on the side of the select monitor A and selecting a desired item from the menu displayed on the display 30 with the keyboard 32,
Fault 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 power train 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. 9, the ECU 2 includes a CPU 3 which is a main arithmetic unit, a ROM 4 in which fixed data such as an engine control program and various maps are stored.
RAM 5 in which data after processing output signals of various sensors and switches and data processed by calculation are stored, input interface 6 for inputting signals from various sensors and switches, and control signals for various actuators are output. The output interface 7 is configured with a microcomputer, which is connected to each other via a bus line, as a core, a constant voltage circuit 8 that supplies a constant voltage to each unit, and a drive circuit that drives actuators by signals from the output interface 7. 9 and other peripheral circuits are built in.

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.

The drive circuit 9 applies a high voltage to the canister controller 19 for controlling the canister purge amount, the throttle actuator 20 for controlling the throttle opening, the idle control actuator 21 for controlling the idle speed, and the spark 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 through 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 installed in a dealer's service factory or the like, and inside is provided with a main control unit 35 including a microcomputer, a power supply circuit 36 for supplying a constant voltage to each unit, and the like. The main controller 35 includes a cassette connector 37.
A detachable memory cassette 60 is connected via the so as to be exchangeable from the outside.

In the power supply circuit 36, the battery VB of the vehicle B is connected via a cigarette lighter cable, or a 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 in-vehicle electronic control device C, lighting (or blinking) of the light emitting diode 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 the data and the ROM 61 provided in the memory cassette 60 are connected to each other via a bus line. Keyboard 32 keyboard Key illumination drive circuit 44a for driving the a scaling light emitting element is provided.

In the present embodiment, the backlight light emitting element of the keyboard 32 is a green light emitting diode LE.
DG and a red light emitting diode LEDR are used, and one set of a green light emitting diode and a red light emitting diode L is provided for each key.
EDG, LEDR are incorporated, and the key lighting drive circuit 44
It is driven by a.

Each set of light emitting diodes LEDG, LEDR
The anode side is connected to the constant voltage power supply Vcc from the power supply circuit 36, and the cathode side is connected to the collectors of the emitter-grounded NPN type transistors TRG and TRR via resistors RCG and RCR, respectively.
The base side of each transistor TRG, TRR is
It is connected to the latch RC via resistors RBG and RBR.

In FIG. 10, two latches RC are used and six sets of light emitting diode LEDs corresponding to six keys are provided.
The six transistors TRG and TRR for driving G and LEDR are controlled by one latch RC, and each latch RC is connected to the bus line of the microcomputer constituting the main control section 35. . When the green light emitting diode LEDG and the red light emitting diode LEDR are selectively turned on and the key function is changed, the corresponding key is illuminated from, for example, the green light emitting diode LEDG. The light emitting diode LEDR of red color is switched to.

On the other hand, the diagnostic interface 43 is used.
Is an FPGA (Field Programmab) that can reprogram logic functions onboard by giving design information.
This FPGA is mainly composed of
Enables an I / O interface that can be connected to various in-vehicle electronic control devices C, regardless of the vehicle type and the vehicle manufacturer, and
The hardware of the serial communication interface adapted to the communication protocols of various in-vehicle electronic control devices C can be realized.

Further, the memory cassette 60 allows the select monitor A to be used universally for the diagnosis item, the vehicle type, and the various communication protocols, and the on-vehicle electronic control unit C is used. The diagnostic processing program corresponding to the above, and design data including logic information for reprogramming the FPGA so as to be compatible with the communication protocol of the in-vehicle electronic control unit C are stored.

At the time of failure diagnosis, in order to reprogram the diagnostic processing program corresponding to the on-vehicle electronic control unit C (ECU 2 whose engine is the control target in this embodiment) and the FPGA of the diagnostic interface 43. The memory cassette 60 storing the design data and the like is loaded, the design data of the FPGA stored in the ROM 61 is transferred to the diagnostic interface 43 together with the initialization of the select monitor A, the FPGA is reprogrammed, and the onboard electronic device is reprogrammed. The I / O connection and serial communication with the control device C are made possible.

As described above, the fault diagnosis by the select monitor A is basically a hierarchical menu system, and the fault diagnosis can be easily performed by selecting the menu without requiring advanced knowledge and experience. It is possible, but in this case, the select monitor A uses the keyboard 3
Since the number of the 2 keys is small (12 in this embodiment), a plurality of functions are assigned to the same key, and the key operation is performed while selecting the function mode of the key to proceed with the diagnostic work.

Therefore, in the select monitor A, the illumination state of the backlight is changed corresponding to the change of the key function mode by the functions of the key illumination means, the key function switching means, and the key illumination control means according to the present invention. By so doing, it is possible to easily identify the current function mode of the key while avoiding narrowing the display area of the diagnostic information by displaying the function mode of the key on the display 30.

The process relating to the key illumination of the select monitor A will be described below with reference to the flowcharts of FIGS.

First, when the select monitor A having the memory cassette 60 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 turned on. The controlling CPU 40 is reset, and the processing shown in FIGS. 2 and 3 starts.

In this process, first, in step S101, flags are cleared, a function mode is set for each key of the keyboard 32, and a latch for setting the backlight illumination color of the key to a greenish color corresponding to this function mode. Data set to RC (transistor TRG of key lighting drive circuit 44a
Is turned on to turn off the transistor TRR, that is, data for turning on the light emitting diode LEDG and turning off the light emitting diode LEDR) is initialized, and in step S102, the initial menu screen is displayed from the memory table of the menu screen data. The screen data of a certain select monitor menu is transferred to the video RAM, and the select monitor menu is displayed on the display 30, as shown in FIG.

In FIG. 4, the select monitor menu is a top-level menu consisting of a menu of seven items including extended functions, and the contents registered in the F1-F4 function keys 53-56 are displayed at the bottom of the screen. Is displayed.

The function keys 53 of F1 to F4
In the initial settings, for example, a command for returning to the initial screen, a command for returning to a menu in the next higher layer, a command for resetting, and a command for terminating are assigned to items 56 to 56, respectively. Even when the screen is being processed, it is possible to easily shift to the screen in the desired state by pressing the corresponding function key.

While looking at this menu screen, the worker can use the direction keys 45, 46 ("↑",
Use the “↓” key) to move the cursor up and down, move the cursor to the desired menu item and highlight it, and press the Yes key 51 to confirm the selection and display the next hierarchical menu.

That is, after the select monitor menu is displayed in step S102, the flow advances to step S103 to wait for key input. If there is a key input, the flow advances to step S104 to refer to the key code table and convert the key input into a code. The key to be converted is coded, and it is checked in step S105 from the key code whether the input key is the shift key 49 or not.

If the input is not from the shift key 49 in step S105, the process proceeds to step S106 to check whether the input is from the selection key 50. If the input is not from the selection key 50, the direction key 45 is input in step S107. , 46,
It is checked whether the input is from either 47 or 48. If the input is from any of the direction keys 45, 46, 47 and 48, the key function switching flag Fl is determined in step S108.
See ag.

When the key function switching flag Flag is set to 1, as described later, a mode in which the function mode of the key is initial (hereinafter referred to as a normal mode)
Is changed, and the initial value is Flag = 0. Therefore, when the routine is not performed for the first time or when the key function is not changed, the process proceeds from step S108 to step S109 to perform the key function processing, and then step S1.
Return to 03.

The key function processing in the normal mode in step S109 is performed by pressing the direction key 45 while the menu screen is displayed.
When the ("↑" key) is pressed, the cursor is moved up one line, and when the direction key 46 ("↓" key) is pressed, the cursor is moved down one line.
When the direction keys 47, 48 (“→”, “←” keys) are pressed, the key input is invalidated and step S1 is performed.
Return to 03.

Then, the above steps S109 to S1.
Returning to 03, when there is the next key input, the key input is similarly coded in step S104, and the shift key 49, the selection key 50, and any of the direction keys 45, 46, 47, 48 are pressed. If not, steps S105, S106, 107
After that, the process proceeds to step S112, and it is determined whether or not the input is from the yes key 51.

As a result, if the input is not from the Yes key 51, the process returns from Step S112 to Step S103, and if the input is from the Yes key 51, the above Step S1.
The process proceeds from step 12 to step S113, the process of the confirmed item is executed, and the process returns to step S103. This process is a process for shifting to the menu item on the cursor line while the menu screen in the normal mode is displayed, and as shown in FIG. 4, the cursor is the second "2. Vehicle system failure diagnosis" on the select monitor menu screen. When the Yes key 51 is pressed, the display data of the vehicle failure diagnosis menu is selected from the memory table, transferred to the video RAM, and output to the display 30.

Then, the vehicle failure diagnosis menu on the next layer of the select monitor menu is displayed on the display 30 (see FIG. 5), and steps S103 to S104, S105,
When the input from the Yes key 51 is made in step S112 through S106 and 107, that is, as shown in FIG. 5, the Yes key 51 is pressed while the cursor is placed on the item "1. Data display / memory" in the vehicle failure diagnosis menu. When is pressed, in step S113, the display data of the data display / memory menu is selected from the memory table and the data display / memory menu shown in FIG. 6 is displayed on the display 30. In the initial state of the menu screen display, the cursor is set to the top menu item.

Similarly, in the data display / memory menu, as shown in FIG. 6, when the cursor is moved to the fifth menu item "5. Graph display (1 ch)" and the Yes key 51 is pressed, the graph is displayed. When the engine speed graph is selected from the display setting menu displayed on the display 30, each item of the engine speed graph setting is displayed on the screen as shown in FIG. 7A.

When the shift key 49 is pressed, the function mode of the key is switched. In the present embodiment, different functions are assigned to the direction keys 45, 46, 47, 48, and the input of the shift key 49 changes the function mode of the direction keys 45, 46, 47, 48.
That is, when the shift key 49 is pressed, this shift key 4
Input from 9 is detected in step S105 through steps S103 to S104, and steps S105 to S114.
And the value of the key function switching flag Flag is Flag =
If 0, in step S115, the direction keys 45, 46, 4
The output data to the latch RC is changed so that the light emitting diodes LEDG for backlights 7, 8 are turned off and the light emitting diodes LEDR are turned on.
Set the key function switching flag Flag with 16 (Fla
g ← 1) Return to step S103.

As a result, the direction keys 45, 46, 47,
The backlight illumination of 48 is switched from the green color of the normal mode to the red color, and it is possible to easily recognize that the function mode of the key has been changed in the subsequent key operation, and prevent erroneous operation. You can

It should be noted that in this embodiment, as the key function is changed,
Although the illumination color of the backlight of the corresponding key is switched from green to red, the backlight of the corresponding key may be switched to another system color, for example, from blue to yellow. The backlight may blink. Further, the illuminance of the backlight of the corresponding key may be increased, or only the corresponding key may be turned on and the backlights of other keys may be turned off.

Then, on the engine speed graph setting screen of FIG. 7A, "minimum intake speed--
The cursor reversing the item "-rpm" is shown in Fig. 7.
As shown in (b), the shape is changed so that the least significant digit portion of the numerical value input before the display of "rpm" is highlighted, and the direction keys 45, 46, 4 are pressed in the screen display state prompting for this numerical value input.
When 7, 48 are operated, steps S103, S104, S105, S106,
After S107, the process proceeds from step S107 to check whether or not the directional key is input, to step S108.

As described above, the key function switching flag Flag is referred to in step S108, but when the key function mode is changed and Flag = 1, the process proceeds from step S108 to step S110, and the key function switching process is performed to execute the step. S1
After performing various processes in 11, the process returns to step S103.

In the processing accompanying the switching of the key function from step S110 to step S111, the function of the direction key 45 is changed from the cursor upward movement in the normal mode to 0 → 1 → 2 → 3 →
4 → 5 → 6 → 7 → 8 → 9 It becomes a function to increase the numerical value, and the function of the direction key 46 is 9 → 8 → 7 → 6 → 5 → 4 → 3 → 2 → from the cursor down movement in the normal mode. It has the function of decreasing the value from 1 to 0. Further, as shown in FIG. 7 (c), the digit keys can be used to move the digits for digit input, and the numeric keys 0 to 9 can be rotated by operating the arrow keys 45, 46, 47, 48. You can enter numbers in all digits.

Then, the minimum fetching rotational speed is set by inputting a numerical value by operating the direction keys 45 and 46 and shifting the digit by operating the direction keys 47 and 48, and when the selection key 50 is pressed, steps S103, S104 and S105 are executed. After that, the process proceeds from step S106 for checking whether or not the selection key is input, to step S117, and the value of the key function switching flag Flag is referred to in step S117.

In the above-mentioned step S117, when the flag = 0 in the normal mode, the processing corresponding to the operation input is executed in the step S118 and the process returns to the step S103. When the flag = 1 and the key function mode is changed, the step is executed. After proceeding to S119 and storing the set input value such as the minimum fetching rotational speed set by the operation of the direction keys 45, 46, 47, 48 in the memory, the output data to the latch RC in the normal mode is stored in step S120. The value is returned to the value and the key function switching flag Flag is cleared in step S121 (Flag ←
0), and returns to step S103.

As a result, the direction keys 45, 46, 47,
The backlight light emitting diode LEDR of 48 is turned off, the light emitting diode LEDG is turned on, and the backlight illumination of the direction keys 45, 46, 47, 48 is switched from the red color to the green color of the normal mode.

In this case, the set input value can be stored in the memory and the key function mode can be returned to the normal mode by operating the shift key 49 in addition to the selection key 50. When Flag = 1 in step S114, that is, Shift key 4
When the shift key 49 is pressed again after the function of the direction keys 45, 46, 47, 48 is changed by the input of 9, the process proceeds from step S114 to step S119, and the output data to the latch RC is changed to the direction key. 45, 46, 47,
The data for turning on the light emitting diode LEDR for the backlight of 48 is returned to the data for turning on the light emitting diode LEDG, and the illumination for the backlight of the direction keys 45, 46, 47, 48 is switched from the red color to the green color of the normal mode. Then, in step S116, the key function switching flag Flag is cleared (Flag ← 0) and the process returns to step S103.

Then, the direction keys 45, 46, 47, 48
When the function mode of the is returned to the normal mode, the direction key 46
By doing so, the cursor can be moved downward from the item of the minimum fetch rotational speed on the display screen of the engine rotational speed graph setting of FIG. 7A, and the key function mode is changed again by operating the shift key 49 to Acquisition speed-
A numerical value can be entered in the "--rpm" item and the set input value can be confirmed by the selection key 50 or the shift key 49. Further, the same procedure is repeated to perform "time axis full scale --- sec". , "Sampling period ---- ms" can be entered by entering a numerical value to confirm the set value.

As described above, when the engine speed graph setting is completed and the Yes key 51 is pressed, the input from the Yes key 51 is detected in Step S112 from Step S103 through Steps S104, S105, S106, 107, and is confirmed in Step S113. The processing of the item is executed. The process here is a process of starting data communication with the ECU 2, reading engine speed data for a predetermined period of time, processing the read data, and graphing the data. As a result of the process, as shown in FIG. The engine speed graph is displayed on the display 30.

After that, when another menu item is to be executed, the function key 56 of F4, for example, is pressed to end the display of the engine speed graph, and the target item is selected by the same operation. In addition, the function key 54 of F2 is pressed to return to the vehicle failure diagnosis menu of the previous hierarchy, and F1 is pressed to return to the initial select monitor menu.
By pressing the function key 53 of and the same operation, the target menu item can be selected and the diagnosis can be continued.

[0060]

As described above, according to the present invention, when the key function of a key having a plurality of functions set in advance is switched according to the selection input, the illumination state of the backlight of the corresponding key is changed. , It is possible to reliably identify the current function mode of the key and prevent erroneous operation. Moreover, since there is no need to display the function mode of the key on the display screen, the display area for diagnostic information is narrowed. Never.

[Brief description of drawings]

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

FIG. 2 is a flowchart of a menu processing routine (No. 1)

FIG. 3 is a flowchart of a menu processing routine (No. 2)

FIG. 4 is an explanatory diagram of a select monitor menu screen.

FIG. 5 is an explanatory diagram of a vehicle failure diagnosis menu screen.

[Figure 6] Illustration of the data display / memory menu screen

FIG. 7 is an explanatory diagram of a graph display setting menu screen.

FIG. 8 is an explanatory view of a display screen of an engine speed graph,

FIG. 9 is a circuit block diagram of an on-vehicle electronic control device and a failure diagnosis device.

FIG. 10 is a circuit diagram of a key lighting drive circuit.

FIG. 11 is an external view of a failure diagnosis device connected to an in-vehicle electronic control device.

[Explanation of symbols]

A ... Failure diagnosis device (key illumination means, key function switching means, key illumination control means) C ... Electronic control device 32 ... Keyboard (key operation input section)

Claims (2)

[Claims] 1. A failure diagnosis of a control system of a vehicle including the electronic control device is performed by connecting to an electronic control device mounted on the vehicle and reading data in the electronic control device by a key operation of a key operation input unit. In the failure diagnosis device, a key illumination means for illuminating each key of the key operation input section with a backlight, and a key function of the key operation input section for which a plurality of functions are set in advance are provided with a key function according to a selection input. A failure diagnosis device comprising: a key function switching means for switching; and a key illumination control means for changing the illumination state of the corresponding key by the key illumination means when the key function is switched by the key function switching means. . 2. The failure diagnosis device according to claim 1, wherein the key illumination control means changes the illumination state of the corresponding key according to illumination color or brightness.