Automotive Diagnostics

Warning on ECU Diagnostic Pitfalls: Is the 0x27 Key Algorithm the ‘Bricking’ Culprit? Discover the Efficiency Doubling Secrets of 0x28 Communication Control, Lessons Learned by Engineers!

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Warning on ECU Diagnostic Pitfalls: Is the 0x27 Key Algorithm the 'Bricking' Culprit? Discover the Efficiency Doubling Secrets of 0x28 Communication Control, Lessons Learned by Engineers!

In automotive electronic diagnostics, secure access (0x27) and communication control (0x28) are two key technologies. The former protects ECU data security, while the latter optimizes communication efficiency. Mastering these is essential for becoming a diagnostic expert! 1. Secure Access (SID 0x27): The ECU’s ‘Password Lock’ Mechanism The ECU stores critical vehicle data (such as program … Read more

Methods for Rapid Diagnosis of ECU Functionality

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Methods for Rapid Diagnosis of ECU Functionality

There are input and output circuits on the ECU hardware, while the software consists of programs and data. The assessment of ECU functionality should focus on these three aspects. Given the numerous pins and functions utilized by the ECU, it is advisable to create a project list and measure each item one by one. Measurement … Read more

Guide to Diagnosing and Repairing ECU Control Anomalies

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Guide to Diagnosing and Repairing ECU Control Anomalies

1. Core Fault Analysis of ECU Anomalies 1. Program Corruption: The “Amnesia” of Digital Neurons Typical Triggers: Unofficial ECU tuning (e.g., aggressive first/second-order program flashing leading to checksum failure) CAN bus signal conflicts (devices occupying diagnostic protocol IDs, such as permanent devices on the OBD interface) OTA upgrade interruptions (voltage fluctuations causing packet loss rate … Read more

Measurement Methods for LIN Bus Using Oscilloscope and Multimeter

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Measurement Methods for LIN Bus Using Oscilloscope and Multimeter

1. Self-Diagnosis of LIN BusWhen performing self-diagnosis on the LIN data bus system, the address code of the LIN master control module must be used. The self-diagnostic data is transmitted from the LIN slave control module to the LIN master control module via the LIN bus. All self-diagnostic functions can be completed on the LIN … Read more

A Handy Trick for Locating Breakpoints in Wires Using a Multimeter

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A Handy Trick for Locating Breakpoints in Wires Using a Multimeter

Electrical Engineering Learning Network: www.dgdqw.com Follow the official WeChat account of the Electrical Engineering Learning Network “Electrical Engineering and Electronics” to gain more experience and knowledge. The multimeter is the primary troubleshooting tool for electricians. Once accustomed to it, even when a fault occurs that could be diagnosed without a multimeter, one may feel uneasy … Read more

Comprehensive Diagnostic Instruments

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Comprehensive Diagnostic Instruments

……….. Comprehensive instruments are diagnostic devices that integrate multiple testing functions into one, making it more convenient for on-site fault diagnosis with multi-parameter detection. Currently, there are mainly six combinations of testing functions for such instruments: ① combination of pressure and flow; ② combination of pressure, flow, and temperature; ③ combination of pressure, flow, and … Read more

Introduction to Pico Automotive Oscilloscope Functions

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Introduction to Pico Automotive Oscilloscope Functions

May 2020 Introduction to the Equipment The pico automotive oscilloscope perfectly combines hardware and software, making it one of the most advanced automotive fault diagnostic devices available today. As shown in Figure 1, it mainly consists of the oscilloscope host (such as pico scope 4425, pico scope 4823, etc.), diagnostic software (pico scope 6 automotive … Read more

Common Sensor Waveform Analysis: Everything You Need in One Article!

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Common Sensor Waveform Analysis: Everything You Need in One Article!

(Warm reminder: The article is quite long, totaling 3300 words; it is recommended to bookmark it for later reading.) During automobile maintenance, oscilloscopes are extremely useful, especially when performing non-disassembly diagnostics, troubleshooting analysis, and bus diagnostics, making them indispensable. When combined with other diagnostic tools (such as diagnostic computers, test lamps, multimeters, etc.), they can … Read more

Learn Circuit Repair From Scratch – ECU Power Communication Jumper and Car Diagnostic Port Definition

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Learn Circuit Repair From Scratch - ECU Power Communication Jumper and Car Diagnostic Port Definition

Master Truck Repair ★ Learn Circuit Repair Series Course ★ 01 Lecture 1 – Detailed Practical Explanation 02 Lecture 2 – Computer Boards, Pins, Circuit Diagrams 03 Lecture 3 – ECU Power Communication Jumper and Car Diagnostic Port Definition 04 Lecture 4 – ECU Main Relay and Power Supply Module Explanation 05 Lecture 5 – … Read more

ECU Repair: A Lifesaver!

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2017, Happy New Year! This Issue Guide: Many mechanics often ask me why the motor won’t start and there’s no response when trying to start the car. When I encounter such issues, I honestly feel reluctant, especially when there are no fault codes. This kind of problem is systemic and involves various aspects of the … Read more