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00:00:00 – 00:24:36
The video provides an in-depth introduction to automotive electrical diagrams, focusing particularly on guiding beginners through understanding and interpreting these diagrams. The key themes include the basic knowledge required for automotive electricity, the significance of electrical diagrams in diagnosing issues, and the identification and use of essential symbols and components such as batteries, fuses, switches, and sensors. The speaker emphasizes the correct interpretation of cable connections and tracing the paths of electrical currents, grounds, and signals using color-coded markers. Through practical examples, the video illustrates troubleshooting common electrical problems in vehicles, such as a non-functioning light bulb or an issue with an injector. Critical components like the TPS sensor and the coolant temperature sensor are discussed in detail, highlighting the importance of identifying and verifying connections both in diagrams and physically within the vehicle. The speaker underscores the importance of continuous learning and understanding new electrical symbols and concepts as one advances.
00:00:00
In this part of the video, the presenter discusses automotive electrical diagrams, offering tips for beginners in automotive electricity. The key points include:
1. **Basic Knowledge Requirements**: Emphasizes the need for basic knowledge of electricity and car electrical components.
2. **Importance of Electrical Diagrams**: Highlights that these diagrams are designed to simplify electrical diagnoses.
3. **Essential Symbols and Components**: Reviews basic symbols and components frequently found in automotive electrical diagrams, such as batteries, circuit breakers, connectors, diodes, fuses, heaters, light bulbs, resistors, thermal sensors, solenoids, switches, light-emitting diodes, ground diagrams, transistors, potentiometers, speakers, and cables.
The segment aims to ease beginners into reading and understanding automotive electrical diagrams step by step by familiarizing them with these basic elements.
00:03:00
In this part of the video, the speaker discusses the importance of connecting cables properly in electrical diagrams, highlighting that some cables may appear crossed in diagrams but do not actually intersect in the physical circuit. The focus then shifts to understanding basic electrical symbols, such as those found in multimeters. The speaker provides an example of using an interior light diagram of a truck to troubleshoot a courtesy light failure. The process involves isolating the problem, identifying the malfunctioning component, and understanding how the courtesy light operates, including checking the associated cables and signals.
00:06:00
In this part of the video, the presenter explains how to trace the path of an electrical cable connected to a fuse, using three different colors of markers (red for currents, green for grounds, and yellow for signals) to mark and follow the current path. They identify a 20 amp fuse supplying direct current to a bulb requiring both current and ground to operate. The presenter then details how various switches (right door, left door, and courtesy switches) connect to the ground, which, when closed, provide continuity and complete the circuit to the bulb experiencing the issue. This method clarifies where the currents and grounds are located, ensuring proper function when switches close to provide the necessary ground.
00:09:00
In this part of the video, the speaker discusses troubleshooting an electrical issue, such as a non-functioning light bulb, by reasoning potential causes like a problem with the ground or switches. They emphasize the importance of isolating the problem using a diagram and provide an example involving a more complex electrical system, such as an injection computer. The example focuses on diagnosing a TPS sensor by identifying connections and analyzing the related wires (gray, black, and blue) in the diagram. The speaker mentions that color abbreviations in diagrams are usually in English and promises to provide a table of these abbreviations later. They demonstrate how to trace the path of the gray cable through the diagram to pin 14.
00:12:00
In this part of the video, the presenter continues identifying and tracing various cables connected to a sensor. They move from examining a gray cable to a black cable and then to a blue cable. The black cable is noted to be connected to another cable and sensor, marked at 5 volts. The presenter follows the blue cable and confirms it as the signal cable of the TPS sensor, highlighting that it is not shared with any other cable. The process includes both tracing the cables within a diagram and physically checking the cables in the connector. The presenter emphasizes the importance of basic knowledge about the sensor, which includes identifying current, ground, and signal cables. Finally, they identify the strong blue or dark blue cable as the signal cable and proceed to discuss the next important cable marked at 5 volts.
00:15:00
In this part of the video, the speaker discusses identifying and marking sensor cables in an electrical system. They explain that ground wires are typically black and will mark them with green for clarity. A specific sensor, the coolant temperature sensor, shares this ground. The current for the sensor is expected from a 5-volt reference wire, often marked with red. The speaker distinguishes between the three sensor cables: gray for current, black for ground, and blue for the signal. They proceed to verify these connections physically at the sensor connector. If there’s an issue with the voltage not reaching the sensor, the speaker suggests troubleshooting the cable or examining potential problems at the computer or related fuses.
00:18:00
In this part of the video, it explains that a specific fuse is active only when the car is on, and this is indicated by a light on the instrument panel. The example given is similar to a “check engine” light that turns on when starting the car and turns off after a few seconds. The segment then discusses how this fuse relates to the car’s computer and the importance of checking the currents and grounds for proper functionality. This involves following cables to understand the connections, such as a double ground connection, or analyzing actuators and solenoids which typically have two cables for current and ground. The example focuses on identifying and troubleshooting an injector issue, specifically injector number one.
00:21:00
In this part of the video, the speaker is diagnosing an electrical issue in a vehicle by tracing the wiring of the injectors. They follow the first cable and identify that it receives constant current directly from the fuse box, indicating it is on the current side. They note that the current is common to all injectors, meaning a failure in this wire would affect all injectors. They then trace the second cable and realize that it and another cable work in pairs, indicating they handle the ground side. This ground control, verified to come from the computer, is illustrated by a blue cable in the diagram. The speaker explains that each pair of injectors shares a ground control signal from the computer. If the ground cable fails, both paired injectors will fail, whereas a failure downstream will only affect a single injector. This segment highlights how understanding and isolating electrical diagrams can greatly simplify problem-solving in automotive diagnostics.
00:24:00
In this part of the video, the speaker emphasizes the importance of basic knowledge of electrical components and mentions that as one progresses, there will be a deeper understanding of components, electrical circuits, faults, and other aspects of electrical diagrams. The speaker advises being prepared for encountering new symbols and emphasizes the ongoing learning process in working with electrical diagrams. The segment concludes with a thank you to the viewers and a sign-off.