Portable automobile engine fault diagnosis instrument

Abstract

The utility model relates to a diagnostic instrument, in particular to a portable automobile engine fault diagnostic instrument. The diagnostic apparatus comprises a box body, a panel is fixedly arranged on the box body, and a plurality of detection terminals are arranged on the panel; a circuit board is arranged at the bottom of the panel in the box body, a male end plug is connected to the circuit board through a wire harness, and each pin of the male end plug is connected with the corresponding detection terminal through the wire harness and the circuit board in sequence. The diagnostic instrument is simple in structure and convenient to carry, is conducted with the ECU through the detection terminal, and takes the detection terminal as a contact carrier of the universal meter; after an ECU (Electronic Control Unit) is connected through a plug, repeated and repeated detection can be carried out on the diagnosis box through the detection terminal, so that the fault of an engine is accurately detected; and in the detection process, the detection terminal is contacted for detection, and the pins of the ECU are not required to be directly contacted, so that the pins of the ECU can be effectively protected from being damaged. The problem that an ECU is prone to being damaged in an existing detection mode is solved.

Description

Technical Field

[0001] This utility model relates to a diagnostic instrument, specifically a portable automotive engine fault diagnostic instrument. Background Technology

[0002] The car engine is controlled by the ECU (Electronic Control Unit), which uses various sensors (oxygen sensor, exhaust phase sensor, crankshaft position sensor, etc.) to determine the engine's status. During long-term use, the engine is affected by vibrations from vehicle operation, which can cause the transmission of...

[0003] Sensors are prone to detachment or poor soldering, leading to engine malfunctions. While initial engine fault codes in the ECU can provide a preliminary diagnosis, further diagnosis and verification are required during repair. Current diagnostic methods involve connecting a multimeter to the ECU.

[0004] The multimeter measures the resistance, voltage, or current of each component by connecting the output and input pins, thereby comprehensively judging the fault based on the test data. Since diagnosis and verification often require multiple and repeated measurements, when using a multimeter, the probes need to be repeatedly touched to the output and input pins of the ECU.

[0005] However, if too much force is applied during the measurement process, it can damage the output and input pins of the ECU. Therefore, it is necessary to design a portable automotive engine fault diagnostic tool to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a portable automotive engine fault diagnostic instrument that can accurately detect engine faults through repeated testing and is not prone to damaging ECU pins.

[0007] The technical solution of this utility model is:

[0008] A portable automotive engine fault diagnostic tool comprises a housing, a panel, test terminals, a circuit board, a wiring harness, and a male connector. Its distinguishing feature is that a panel is fixedly mounted on the housing, and the panel has multiple test terminals; a circuit board is located at the bottom of the panel inside the housing, and the circuit board...

[0009] The wiring harness has a male connector, and each pin of the male connector is connected to the corresponding detection terminal in sequence through the wiring harness and the circuit board.

[0010] Multiple voltage detection modules are provided on the front panel of the detection terminal.

[0011] The female plug is connected to the circuit board on one side of the male plug via a wire harness. The panel on the side of the female plug is equipped with multiple signal fault setting knobs. Each pin of the signal fault setting knob is connected to the corresponding pin of the female plug or the male plug via the circuit board and the wire harness.

[0012] The panel next to the signal fault setting knob is equipped with multiple control output fault setting switches. Each pin of the control output fault setting switch is connected to the corresponding pin of the female or male plug through a circuit board and a wire harness.

[0013] Multiple signal fault setting extension terminals are provided on the panel between the signal fault setting knob and the control output fault setting switch.

[0014] The beneficial effects of this utility model are as follows:

[0015] This portable automotive engine fault diagnostic tool is simple in structure and easy to carry. It connects to the ECU via test terminals, which serve as the contact points for a multimeter. After connecting to the ECU via a plug, repeated tests can be performed on the diagnostic box using the test terminals to diagnose the engine fault.

[0016] Accurate engine fault detection; and the detection process involves contact with the test terminals, rather than direct contact with the ECU pins, effectively protecting the ECU pins from damage. By setting signal faults and output faults, faults can be reproduced, thus accurately diagnosing the fault and facilitating teaching purposes. This solves the problem of existing detection methods easily damaging the ECU. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure in the AA direction;

[0019] Figure 3 This is a schematic diagram of the overall circuit of this utility model;

[0020] Figure 4 This is a schematic diagram showing the distribution of the detection terminals of this utility model;

[0021] Figure 5 This is a schematic diagram of the pin distribution of the male connector of this utility model;

[0022] Figure 6 This is a schematic diagram of the pin distribution of the female connector of this utility model;

[0023] Figure 7 This is a circuit diagram of the new signal fault setting extension terminal;

[0024] Figure 8-11 This is a circuit diagram of the various signal fault setting knobs of this utility model;

[0025] Figure 12-14 This is a circuit diagram of the fault setting switches for each control output of this utility model.

[0026] In the diagram: 1. Box body, 2. Panel, 3. Detection terminal, 4. Circuit board, 5. Wiring harness, 6. Male plug, 7. Voltage detection module, 8. Female plug, 9. Signal fault setting knob, 10. Control output fault setting switch, 11. Signal fault setting extension terminal. Detailed Implementation

[0027] Take the engine diagnosis of the Dongfeng Fengguang New 580 model as an example.

[0028] This portable automotive engine fault diagnostic tool consists of a housing 1, a panel 2, test terminals 3, a circuit board 4, a wiring harness 5, and a male connector 6. The panel 2 is fixedly mounted on the housing 1, and multiple test terminals 3 are provided on the panel 2. The circuit board is located at the bottom of the panel 2 inside the housing 1.

[0029] 4. A male connector 6 is connected to the circuit board 4 via a wiring harness 5. Each pin of the male connector 6 is sequentially connected to the corresponding detection terminal 3 via the wiring harness 5, the circuit board 4, and the circuit board 4. The function of the detection terminal 3 is to connect the circuit board 4, the wiring harness 5, and the circuit board 6 via the detection terminal 4.

[0030] The pins of male connector 6 connect to the pins of the ECU, so measuring between each test terminal 3 is equivalent to measuring the pins of each ECU, thus enabling accurate engine fault detection. Because the detection is performed through test terminals 3, without direct contact with the ECU pins,

[0031] It is less likely to affect the ECU pins, thus effectively protecting the ECU pins from damage; at the same time, since the detection terminals 3 can be distributed, compared with the dense arrangement of ECU pins, multiple items can be detected simultaneously through the detection terminals 3, which can effectively improve detection efficiency and facilitate detection.

[0032] According to Table 1-2 below and the appendix Figure 3-5 Connect the detection terminal 3 to the male plug 6.

[0033]

[0034] Table 1 is a table of test terminal numbers.

[0035]

[0036] Table 2 is a table of male connector pin numbers.

[0037] Example: Detection terminal 3, numbered X1 / 1, is connected to pin 1 of male connector 6 via wire harness 5, numbered X1-1, and circuit board 4; and so on.

[0038] Multiple voltage detection modules 7 are installed on the front panel 2 of the detection terminal 3 to measure the voltage between the detection terminals 3, and thus the voltage between the ECU pins. The voltage detection modules 7 are 0.28-inch ultra-small digital DC voltmeters.

[0039] Digital display module, DC 0-100V battery voltmeter with adjustable three wires.

[0040] A female connector 8 is connected to the circuit board 4 on the male connector 6 via a wiring harness 5. Multiple signal fault setting knobs 9 are located on the panel 2 on the female connector 8 side. The pins of each signal fault setting knob 9 are connected sequentially to either the female connector 8 or the male connector via the circuit board 4 and the wiring harness 5.

[0041] Connect the pins corresponding to plug 6. The function of the signal fault setting knob 9 is to simulate signal faults by rotating it, creating open circuits, short circuits, signal crossovers, and loose connections between different circuits (see Table 5).

[0042] This can be used to verify faults, or to set up faults for teaching purposes.

[0043] According to Table 2-4 and Appendix Figure 3 , 5 Connect the signal fault setting knob 9 to the male plug 6 or the female plug 8, respectively.

[0044]

[0045] Table 3 shows the pin numbering table for the female connector.

[0046]

[0047] Table 4-1 Pin Numbering Table for Signal Fault Setting Knob

[0048]

[0049] Table 4-2 Pin Numbering Table for Signal Fault Setting Knob

[0050] Example: Pins 1, 3, and 8 of the signal fault setting knob 9 (numbered SR1) are connected to wire harnesses numbered OX1-10 via the circuit board, pins 4-6 are connected to wire harnesses numbered OX1-11, pin 11 is connected to wire harnesses numbered X1-10, and pin 12 is connected to wire harnesses numbered X1-11.

[0051] Pin 1 of the signal fault setting knob 9, numbered SR3, is connected to the wiring harness numbered OX1-54 via the circuit board. Pin 3 is connected to the wiring harness numbered OX2-73. Pin 11 is connected to the wiring harness numbered X1-54. Pin 4 is connected in series with a 2KΩ resistor, and pin 5 is connected in series with a 10KΩ resistor and then connected to pin 1 respectively.

[0052] And so on.

[0053]

[0054] Table 5-1 shows the fault tables for different settings of the signal fault setting knob 9, corresponding to the sensor faults.

[0055]

[0056] Table 5-2 shows the fault tables for different settings of the signal fault setting knob 9, corresponding to the corresponding sensors.

[0057] Example: When the signal fault setting knob 9, numbered SR1, is turned to position 2, an open circuit fault is formed in the PTCAN (CAN network cable);

[0058] And so on.

[0059] On the panel 2 next to the signal fault setting knob 9, there are multiple control output fault setting switches 10. Each pin of the control output fault setting switch 10 is connected sequentially to the corresponding pin of the female connector 8 or male connector 6 via the circuit board 4 and wiring harness 5. (Control output fault setting)

[0060] The function of switch 10 is to activate different circuits by toggling the control output fault setting switch 10, thereby creating a fault (see Table 7 (Table 7 includes Tables 7-1 and 7-2)). This allows for fault reproduction, verification, and diagnosis, or validation of repair results. Simultaneously, by creating a fault, [further details are needed].

[0061] For teaching purposes.

[0062] According to Tables 2, 3, and 6 (including 6-1, 6-2, 6-3, and 6-4) and the appendix Figure 3 , 5 Connect the control output fault setting switch 10 to the male plug 6 or the female plug 8, respectively.

[0063]

[0064] Table 6-1 shows the pin numbers of the control output fault setting switch 10.

[0065]

[0066] Table 6-2 shows the pin numbers of the control output fault setting switch 10.

[0067]

[0068] Table 6-3 Pin Numbering Table for Control Output Fault Setting Switch 10

[0069]

[0070] Table 6-4 Pin Numbering Table for Control Output Fault Setting Switch 10

[0071] Example: Connect pin 1 of the control output fault setting switch 10, numbered SW1, to the wiring harness numbered OX1-14 via the circuit board; connect pin 2 to the wiring harness numbered X1-14; connect pin 3 to pin 1 via a 200Ω resistor connected in series via the circuit board; and so on.

[0072]

[0073] Table 7-1 is a fault table for different gear positions of switch 10 for control output fault settings.

[0074]

[0075] Table 7-2 Fault Table for Different Positions of Switch 10 for Control Output Fault Settings

[0076] Example: When the control output fault setting switch 10, numbered SW1, is moved to position 2, an open circuit fault is formed in the control output of the starting relay pin 85; and so on.

[0077] Multiple signal fault setting extension terminals 11 are provided on the panel between the signal fault setting knob 9 and the control output fault setting switch 10. The circuit connections of the signal fault setting extension terminals 11 are shown in the appendix. Figure 3 , 5 -7 and Table 8.

[0078]

[0079] Table 8 shows the numbering of the extension terminal 11 for signal fault settings.

[0080] By connecting multiple signal faults via jumpers, the extended terminal 11 can be configured to combine signal faults, enabling more complex system-level faults (such as throttle signal crossover and CAN-H loose connection combination).

Claims

1. A portable automotive engine fault diagnostic instrument, comprising a housing (1), a panel (2), test terminals (3), a circuit board (4), a wiring harness (5), and a male connector (6), characterized in that: A panel (2) is fixed on the box (1), and multiple detection terminals (3) are provided on the panel (2); a circuit board (4) is provided at the bottom of the panel (2) inside the box (1), and a male plug (6) is connected to the circuit board (4) through a wire harness (5). Each pin of the male plug (6) is connected to the corresponding detection terminal (3) through the wire harness (5) and the circuit board (4) in sequence.

2. The portable automotive engine fault diagnostic instrument according to claim 1, characterized in that: Multiple voltage detection modules (7) are provided on the panel (2) at the front end of the detection terminal (3).

3. The portable automotive engine fault diagnostic instrument according to claim 1, characterized in that: A female plug (8) is connected to a circuit board (4) on one side of the male plug (6) via a wire harness (5). A number of signal fault setting knobs (9) are provided on the panel (2) on one side of the female plug (8). Each pin of the signal fault setting knob (9) is connected to the corresponding pin of the female plug (8) or the male plug (6) via the circuit board (4) and the wire harness (5).

4. A portable automotive engine fault diagnostic instrument according to claim 3, characterized in that: Multiple control output fault setting switches (10) are provided on the panel (2) next to the signal fault setting knob (9). Each pin of the control output fault setting switch (10) is connected to the corresponding pin of the female plug (8) or male plug (6) through the circuit board (4) and the wire harness (5).

5. A portable automotive engine fault diagnostic instrument according to claim 4, characterized in that: Multiple signal fault setting extension terminals (11) are provided on the panel between the signal fault setting knob (9) and the control output fault setting switch (10).

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