By Admin
2024-12-13 03:45:56
Automotive Engine Wiring Harness Guide
The automotive engine wiring harness is the core connection network of the vehicle's electrical system, responsible for integrating data transmission and power supply between the engine control unit (ECU), sensors and actuators, ensuring efficient and stable operation of the power system.
Function of automobile engine wiring harness
Core function positioning
- Data exchange center: Real-time transmission of sensor data such as speed, temperature, oxygen content, etc. to the ECU, and synchronous feedback of control signals (such as ignition command, injection pulse width) to the execution unit.
- Power transmission channel: Power key components such as spark plugs and fuel pumps, supporting 12V/48V hybrid voltage system.
- Fault protection barrier: Suppress electromagnetic interference (EMI) through the shielding layer and reduce the signal distortion rate to <3%.
Composition of automotive engine wiring harness structure
Component type |
Materials/Specifications |
Features |
| conductor | Multi strand tinned copper wire (cross-sectional area 0.5-16mm ²) | Conductivity ≥ 58MS/m, resistance to bending fatigue>100000 times |
| Insulating sheath | PVC (economical), silicone rubber (high temperature resistant) | Tolerant to operating conditions of -40 ℃~125 ℃ |
| Connector | Waterproof terminal (IP67), gold-plated contacts | Contact resistance<5m Ω, plug and unplug life>50 times |
| Fixed parts | Nylon zip ties, corrugated tubes, wire harness brackets | Seismic grade ≥ 5G, wear-resistant design |
How long does it take to replace the car engine wiring harness
Regarding the replacement cycle of the engine harness, if the harness is not damaged, it does not actually need to be replaced. However, in order to ensure its good condition, maintenance should be carried out every 40000 kilometers of driving.
The key to maintaining the engine wiring harness is to use a harness protector, which has the functions of anti-oxidation and moisture-proof, and can effectively extend the service life of the wiring harness.
The engine wiring harness is usually wrapped with machine woven wire or adhesive plastic tape to ensure its safety and facilitate processing and maintenance. At present, machine woven thread wrapping has been phased out, and adhesive plastic tape is commonly used as the wrapping material. The connection between wire harnesses and electrical components is mainly achieved through connectors or wire ears. These connectors are made of plastic, including plugs and sockets, which can be easily connected and disassembled, effectively improving the reliability and safety of automotive circuits.
What are the symptoms of a broken car engine wiring harness
- Encountering difficulties when starting the engine: This is usually a significant sign of a problem with the engine wiring harness. As a core component of the engine electronic system, wiring harness faults often lead to poor engine start-up or frequent engine stalling.
- The warning lights on the dashboard are activated: A malfunction in the engine wiring harness may affect critical vehicle functions such as braking and airbags. At this time, the relevant warning lights on the dashboard will light up to alert the driver.
- Weakening or loss of engine power: Due to the critical role of the engine wiring harness in transmitting fuel, ignition, and sensor signals, its malfunction often leads to a decrease in engine power output, or even complete loss of power.
- Increased fuel consumption: Engine wiring problems may also interfere with the stable operation of the engine, leading to an increase in fuel consumption.
- Vehicle computer system malfunction: Engine wiring harness faults can sometimes affect the vehicle's computer system, causing a series of malfunctions that seriously affect the normal operation of the vehicle.
Through structured design (such as regional bundling) and material iteration (lightweight aluminum conductors), the new generation of engine wiring harnesses can reduce weight by 15% -20%. It also supports 800V high-voltage platforms and is suitable for the transformation needs of electrification and intelligence.
