Professional and versatile solution options for various automotive Engine connectors
- Optional plugs for in – engine – compartment sensors like crankshaft, camshaft, temperature and pressure sensors.
- Optional connection plugs for ignition coil and spark – plug circuits.
- Optional wiring harness plugs for water – temperature sensors, electric fans and thermostats.
- Optional wiring connectors for fuel injectors and fuel – pressure sensors.
- Optional connection plugs for circuits between engine control unit and actuators.
- Engine ECU subsystem: for circuit connection between engine control unit and actuators.
- Engine waterproof connectors: designed for waterproof sealing of exposed engine – compartment wiring harnesses.
- Wiring harness options: single plug + semi – finished product with wire / wire cutting, splitting, corrugated – tube wrapping and buckle – fixing according to engine models.
Your leading and trusted manufacturer of auto Engine Connector.
If you want to avoid potential wiring issues caused by the high – temperature and vibration in the engine compartment, ensuring stable and reliable vehicle electronic control signals and long – term trouble – free operation, then CV’s engine connectors are the solution for you.
At high temperatures, oil mist volatilizes from engine oil and flows to spark plugs. The mixture of oil and water indirectly triggers electrochemical corrosion, resulting in rapid corrosion and oxidation of terminal pins.
To address these issues, CV uses engineering automotive – grade PBT + glass fiber modified plastic material with a UL94 V – 0 flame – retardant rating, which can withstand a high temperature of 120°C. It is equipped with an EPDM rubber sealing ring to isolate the intrusion of engine oil and water vapor. The terminals are made of phosphor bronze base material with a gold – plated coating, and are combined with a TPA secondary locking structure to stably maintain the contact pressure. This fundamentally eliminates vibration – induced loose connections, pin oxidation, and pin withdrawal, firmly ensuring the continuous and stable transmission of the engine’s main control signals.
For the production of connector housings, CV uses constant-temperature injection molding equipment, with the interface edges finely ground and polished to ensure tight and wobble-free mating between male and female connectors; all dimensions are individually inspected before buckle assembly to secure precise sizes and avoid errors. The housings are made of special high-temperature resistant engineering materials that will not deform even in the high-temperature environment of engine compartments, and they are also treated with multi-layer protection featuring UL94 V0 flame retardancy, waterproof sealing as well as impact and abrasion resistance, which can extend the service life of vehicle wiring connectors.
Engine Connector Features
Pin Matching Accuracy:
Molded to replicate original factory specifications; terminals are stamped from high-precision phosphor bronze. Spacing, arrangement, and buckle positions are identical to original parts, with tolerances as follows:
- Plastic housing (pin hole position, buckle, terminal slot key size): ±0.03mm
- Phosphor bronze stamped terminals (pin / socket contact area): ±0.02mm
- Pin center distance (Pitch): Strictly controlled at ±0.015mm
Sealing Performance:
Dual-seal structure (housing slot + built-in rubber ring); the EPDM solid seal ring is embedded into the slot of the housing (locking force of the buckle: 50N-150N). It features waterproof and heat-resistant properties, with an protection rating of IP67/IP6K9K. Tested to operate normally when fully submerged 1 meter underwater.
The provided connectors are all in accordance with the original factory parts of TE, Yazaki, Sumitomo, JST and Furukawa.
One-Stop Matching:
Finished wiring harnesses, semi-finished wiring harnesses, and separate components (housings, terminals, rubber rings) are available. One-stop procurement covers the full range of engine connectors.
- Comes with brand new oil-resistant EPDM sealing gaskets, no separate seals needed.
- Gold-plated terminals available separately; only replace damaged pins if harness stays intact to cut repair costs.
- Equipped with corrugated tubing to shield main harness from oil immersion and extend service life.
- Same lock design as OEM parts, plug-and-play replacement without wiring modification.
Ignition Connector
Ignition coil, switch and ECU signal connectors, finished harnesses, OEM replacement housings & terminals for Japanese, German, American cars and motorcycle EFI ignition systems.
Fuel System Connector
Full EFI fuel connectors for cars & motorcycles: fuel pump, injector, fuel pressure sensor, motorcycle ECU plugs. Fits Toyota, VW, GM, Japanese & European bikes.
Sensor Connector
O2, crankshaft, camshaft, MAP, coolant temp, knock, ABS wheel speed, throttle & oil pressure sensor connectors for motorcycle EFI; 2/3/4/6-pin sealed housings available.
Engine Electronic Connector
Multi-pin engine ECU sockets, sealed plugs for ignition, fuel injection, sensors, harness couplers & DT heavy-duty vibration-resistant connectors, for Japanese, German, American cars and EFI motorcycles.
Engine Wiring Harness Connector
Multi-pin ECU sockets, harness couplers, ignition/fuel/sensor connectors & DT heavy-duty vibration-resistant connectors for all engine wiring branches.
Cooling System Connector
Sealed connectors for coolant temp sensor, electric water pump, thermostat, cooling fan & radiator thermal modules, fit fuel, hybrid & new energy vehicle thermal management parts.
Frequently Asked Questions (FAQs)
If you encounter any issues with engine connectors, feel free to contact us for solutions.
Aged sealing gaskets on engine oil pressure and temperature sensors will cause oil seepage. Engine oil slowly creeps through gaps in wiring jackets and invades ECU and main engine connectors. Oil residue on metal pins disturbs circuit signals and creates minor short circuits, triggering random multiple fault codes on vehicles. In severe cases, precision electronic parts including sensors and ECUs will burn out. This issue occurs frequently on Subaru Impreza and Outback, especially models equipped with CVT transmissions.
How to prevent engine connector damage caused by oil leakage?
- Regularly inspect sealing gaskets of oil pressure & oil temperature sensors. Replace them immediately once hardening or oil seepage is found.
- Choose connectors equipped with oil-resistant EPDM gaskets when replacing engine plugs to block oil penetration.
- Clean up oil spills on wiring connectors right away during engine bay maintenance or oil changes.
Is oil intrusion into connectors a common defect for CVT vehicles?
Yes, it is a frequent inherent issue of such models. Sensors around CVT transmissions are densely arranged. Long-term high-temperature operation accelerates seal aging and oil seepage. Engine oil easily flows along wiring into ECU and TCU connectors, making this a very common repair case in auto shops.
- Disconnect the car battery first to prevent short circuits and component burnout during cleaning.
- Fully unplug the faulty connector, then thoroughly flush the pins and inner cavity with dedicated electronic contact cleaner.
- Repeatedly plug and unplug the connector to wash away residual oil stains inside gaps, then leave it to air-dry completely.
- Clear vehicle fault codes and take a test drive to check if the fault recurs.
Note: Frequent plugging and unplugging will wear pins and latches. This method is only for temporary emergency use and cannot completely fix the root fault.
- Slight corrosion & oil contamination: Clean the pins, bind and fasten the plug tightly to ensure firm pin contact for temporary use.
- Moderate damage: Replace only the corroded metal terminals and oil-resistant waterproof sealing gaskets, keep the original vehicle wiring harness intact.
- Severe ablation & short circuit: Replace the entire brand-new engine connector assembly to eliminate risks of circuit short circuit.
- If the situation is particularly serious, please inform us immediately so that we can replace your connector for you.
Engine oil has weak electrical conductivity, which creates leakage current between adjacent pins and distorts signal transmission. When driving with alternating hot and cold temperatures, oil becomes more fluid, leading to intermittent faults. Mild symptoms include abnormal ignition and power shaking. In severe cases, the ECU or transmission control unit will burn out directly, resulting in extremely high repair costs.
Coolant, also known as antifreeze, is the circulating medium for the engine cooling system with four core functions:
1.Heat dissipation & temperature reduction: It carries away high heat generated by engine combustion to prevent cylinder scoring and engine overheating failure.
2.Freeze & expansion resistance: It won’t freeze under low temperatures, avoiding cracking of engine blocks, radiators and hoses caused by ice expansion.
3.Corrosion & scale prevention: It protects aluminum engine blocks, water pumps and radiators, and stops water scale from clogging cooling passages.
4.Cabin heating supply: The vehicle’s winter heater relies on residual heat from circulating coolant.
Coolant, also known
- Connect an external mechanical oil pressure gauge to measure the actual engine oil pressure and confirm if the oil pressure is truly lost.
- If the measured oil pressure reads zero with abnormal engine noise, it indicates mechanical faults such as oil pump failure or bearing wear. The vehicle needs to be towed for full engine disassembly and overhaul.
- If the measured oil pressure value is normal while only the dashboard triggers an alarm, unplug the oil pressure sensor connector to check for pin corrosion, broken wiring or ground short circuits. Clean or replace the complete sensor connector to fix false signal alerts.
Short circuit to ground, oxidation or broken wires on connector pins lead to two types of reading deviations:
- Abnormal connector grounding: The dashboard continuously shows zero oil pressure, and the fault warning light stays illuminated.
- Harness open circuit: The dashboard constantly displays full-scale oil pressure, with abnormal triggering of the warning lamp.
Neither of these two faults changes the actual engine oil supply pressure, and no mechanical abnormal noises will be produced.
1.Mechanical hardware failure (Critical High Risk)
Symptoms include rattling abnormal engine noise and zero oil pressure reading. This is most likely caused by oil pump failure, crankshaft bearing wear, or extremely low engine oil volume. Such hardware damage triggers both warning lights at once. Every second the engine runs without normal oil pressure will cause irreversible wear to internal components. Do NOT start or drive the vehicle any further.
- Connector electrical fault (Secondary inducing factor)
Aged pins, abnormal grounding or oil corrosion on the oil pressure sensor connector lead to distorted dashboard readings and false oil pressure fault alerts. However, damaged connectors only interfere with signal output; they cannot cause total loss of oil pressure or mechanical abnormal noise from the engine.
Advantages of Our Automotive Engine Connectors for Sensor, Ignition, Cooling and Fuel Systems
- Sensor Series Equipped with gold-plated low-impedance terminals and shielding coating, they maintain stable weak sensor signals without drift, enabling accurate collection of rotational speed, temperature and pressure data.
- Ignition Series Featuring high-voltage flame-retardant coating and thickened conductive spring pieces, they withstand ignition high voltage and high engine compartment temperatures, eliminating cylinder misfire at idle and ignition failure risks.
- Cooling Series With IP67 rating and integrated high-temperature resistant injection-molded housing, they isolate coolant and water vapor to ensure long-term reliable signals for cooling fans and water temperature sensors.
- Fuel Series Adopting high-efficiency oil-resistant and anti-corrosion sealing structure, they resist corrosion from fuel vapor and deliver precise, stable fuel injection control.
Wide Range of Applications
Suitable for electronic control points in the engine compartment of various internal combustion engines, including gasoline and diesel engines for passenger vehicles, hybrid range-extender engines, light truck engines, small internal combustion engines for construction machinery, motorcycle engines, and other internal combustion power equipment.
Premium Quality
Our engine connectors adopt high-quality glass fiber reinforced PA66 housing, renowned for outstanding high temperature resistance, oil corrosion resistance and anti-vibration durability. Custom engineered with excellent tensile strength and high-temperature creep resistance.
Exclusive Premium Manufacturing Services
CV series connectors are produced with advanced equipment including precision terminal stamping, constant-temperature injection molding and fully automatic wire crimping. We deliver high-precision detailed processing with a full set of standardized automotive-grade manufacturing procedures.
Multiple International Certifications
Our manufacturing processes comply with the IATF16949 automotive quality standard, ensuring consistent mass production quality to satisfy customers. Our products hold authoritative certifications including UL, CE, RoHS and REACH.
1.MOQ for regular replica models compatible with TE, Delphi, JST and other brands starts at 100 pieces, and mixed orders of different products are acceptable.
2.Samples of all series models can be requested separately without the 100-piece MOQ limit, ideal for pre-matching, assembly and performance testing.
3.For custom products, flexible order quantities can be negotiated for long-term partnerships; small-batch custom orders are subject to minimum quantity requirements.
We have professional sales staff and after-sales engineers to provide comprehensive guidance and solve all your problems without worries.
1.Mass orders of in-stock items: delivery within 3–7 days
2.Simple customization including logo printing and color modification: 7–12 days.
3.Mold development plus mass production: 25–43 days, subject to product structural complexity Sample delivery: within 3 days
Our connectors feature excellent waterproof performance with IP67/IP68 protection ratings, fully resistant to water splashes, rain and short-term immersion.
Custom pin arrangements ranging from 2P to 112P are supported. We can develop wire-to-wire and wire-to-board connectors. Secondary locking clips, anti-misinsertion bosses, vehicle sheet metal buckles and other mechanical structures can be customized on connector housings as requested.
Silk printing and laser engraving of customer brand logos on housings are available. The size, dimension and shape of products can be adjusted to your requirements.
Optional housing materials include PA66 with glass fiber, PBT with glass fiber and high-temperature resistant PPA. Terminals can be tin-plated or thick gold-plated. Flame-retardant customized products are available by adopting flame-resistant raw materials, and items can reach IP67 / IP68 protection ratings.
Custom silicone sealing gaskets, dust wire stoppers, dedicated pin removal tools and assembly fixtures can be supplied as matching accessories.
