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Brand: C.OEFT
OE numbers: 257416
Product Name: Gearbox Solenoid Valve
Compatible model:/
Product status:New
Product weight:0.071KG
Packaging size: 15X7.5X6 cm
Product packaging:Neutral Packaging
Car Series: France
Car Type:for Marking Citroen
1. Multi-Working-Condition Dynamic Oil Pressure Regulation
Targeting different scenarios such as urban congestion (frequent start-stop), high-speed cruising (constant-speed transmission), and uphill heavy load (high-load output), it has a built-in multi-stage pressure compensation structure, enabling stepless oil pressure regulation within the range of 0.2-2.3MPa. For example, during low-speed shifting between 1st and 2nd gears, it outputs low oil pressure of 0.2-0.7MPa to buffer the clutch engagement impact and improve riding comfort; during rapid acceleration shifting between 3rd and 4th gears or uphill driving, it automatically increases the oil pressure to 1.6-2.3MPa to enhance transmission rigidity and prevent power slipping. At the same time, it transmits data to the TCU in real-time through the oil pressure feedback module, forming a closed-loop control, and controlling the oil pressure fluctuation error within ±0.04MPa to ensure shifting accuracy.
2. Intelligent Fault Monitoring and Self-Protection
Equipped with a current detection chip and a temperature sensor, it can real-time monitor its own working status: when abnormal current (overcurrent ≥ 2.5A or undercurrent ≤ 0.3A), working temperature exceeding 125℃, or valve core jamming caused by hydraulic oil impurities is detected, it will immediately send a fault code to the TCU, triggering a dual protection mechanism—on the one hand, it cuts off its own redundant power supply to prevent coil burnout; on the other hand, it assists the TCU in switching to "limp mode", limiting the maximum gear of the transmission (usually locked within 3rd gear) and output power to avoid fault escalation, providing guarantee for the vehicle's safe return or maintenance.
1. Strong Adaptability to All Environments, No Restrictions on Working Conditions
Optimized design for different climates and road conditions: In low-temperature environments (-45℃ to -10℃), the coil adopts a low-resistance design, which can heat up to the working temperature within 3 seconds after being energized, avoiding shifting delay caused by valve core jamming due to low temperature; in high-temperature environments (above 45℃), the valve body shell has built-in heat dissipation fins, which cooperate with the transmission cooling system to stabilize the working temperature of the solenoid valve within the optimal range of 55-110℃, reducing problems such as coil aging and seal failure caused by high temperature. At the same time, it can withstand the pH change of hydraulic oil (pH 6.0-8.8) and has excellent corrosion resistance, suitable for various complex working conditions such as urban congestion, long-distance high-speed driving, and muddy mountain roads.
2. Controllable Maintenance Cost, Outstanding Cost-Effectiveness
Compared with replacing the entire transmission valve body assembly (cost about 2,000-4,000 yuan), replacing the 257416 solenoid valve alone can reduce maintenance costs by more than 85%; its independent modular design does not require disassembling the core components of the transmission, and only needs to remove the valve body end cover for replacement. The maintenance tools are conventional sockets and wrenches, without the need for special equipment. In addition, the stability of original accessories can reduce the probability of secondary failures (secondary failure rate ≤ 2%), avoiding repeated maintenance expenses, and its comprehensive cost-effectiveness is far superior to that of auxiliary factory accessories.
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