What is the issue with abnormal post-processing wiring harness?
3 Answers
The main causes of abnormal post-processing wiring harness include the following aspects: 1. Natural factors: The wiring harness has exceeded its service life, leading to aging of the wires, damage to the insulation layer, and inadequate mechanical strength, resulting in short circuits, open circuits, and grounding between circuits, which can burn out the wiring harness. Many cases of electrical equipment malfunction are caused by poor contact, often due to oxidation or deformation at the wiring harness terminals. 2. Equipment failure causing damage to the wiring harness: Malfunctions in electrical equipment can easily damage the wiring harness, with common issues including short circuits and open circuits. 3. Subjective human factors: During the assembly or repair of automotive components, metal objects may crush the wiring harness, causing the insulation layer to rupture; improper positioning of the wiring harness; incorrect connection of electrical equipment leads; reversed connection of the battery's positive and negative leads; and during the repair of problematic circuits, haphazard wiring connections or cutting of wires can affect electrical equipment and even burn out the wiring harness.
Abnormalities in the post-processing wiring harness mainly stem from connection issues. I've found that it can cause exhaust purification system failures, such as interrupted sensor signals or actuator malfunctions. Common causes include wiring harness wear and breakage, connector corrosion or looseness, or short circuits/open circuits in the wiring. Vibrations or high-temperature environments can accelerate aging, and prolonged vehicle use can lead to damaged outer insulation, triggering erroneous signals. When the ECU detects abnormalities, it will illuminate the fault light and limit power, affecting acceleration performance and increasing fuel consumption. As someone who frequently handles such repairs, I recommend first checking the wiring harness for any visible physical damage. A simple DIY approach involves using a multimeter to measure resistance and identify short circuits, but professional diagnostic tools are the most reliable. Avoid tampering haphazardly to prevent circuit damage—seek a professional auto shop for comprehensive inspection and repair to prevent excessive emissions or more costly repairs. Early detection and resolution save money and hassle.
When encountering rear wiring harness issues, my vehicle suddenly triggered warning lights and experienced power loss. Diagnosis revealed moisture corrosion at harness connectors disrupted signal transmission. This rendered the exhaust system inoperative with inaccurate urea injection, risking environmental pollution and potential fines. A friend's vehicle previously underwent major repairs due to short circuits from harness abrasion. As an ordinary owner, I've learned to: inspect harness connectors monthly to prevent dust/water damage, schedule professional signal stability tests during maintenance. For safety, drive at low speeds when faults occur (avoid highways) and seek prompt repairs to prevent secondary issues like DPF clogging or engine damage.
