4-Cylinder CNG/LPG Multipoint Sequential ECU with OBD-II
This ECU controls sequential gas injection for compatible four-cylinder petrol engines. It uses the original petrol injector signals as an input for gas injection control. Select the CNG or LPG configuration according to the installed regulator, injectors and sensors.
OBD-II functionality depends on the ECU version and vehicle protocol. Confirm supported communication protocols, available fuel-trim data and calibration functions before ordering. An OBD connection does not automatically mean that every diagnostic or automatic correction function is supported.
Passenger cars, taxis and light commercial vehicles require engine-specific compatibility checks. Provide the engine code and original injection type. Do not assume compatibility with direct-injection engines or every four-cylinder vehicle.
Technical Parameters
The specifications below describe the listed ECU application. Confirm the exact model, hardware version and software version against the quotation and technical sheet.
| Product Type | CNG/LPG multipoint sequential gas injection ECU |
|---|---|
| Cylinder Application | 4-cylinder application; confirm the exact engine and ECU version |
| Nominal Supply | 12 V DC |
| Listed Operating Voltage | 10–16 V DC |
| Listed Operating Temperature | −40°C to +110°C; confirm operating conditions and model-specific test documentation |
| Gas Fuel Application | CNG or LPG with matched components and calibration |
| Calibration | Dedicated PC software; confirm software version and interface requirements |
| OBD-II Functions | Confirm supported protocols, accessible data and correction functions for the supplied version |
| Warranty | 1 year, subject to the agreed warranty terms |
Voltage and temperature ratings do not describe every environmental condition. Request separate information on enclosure protection, mounting requirements and electrical protection where these affect your installation.
Which OBD-II Functions Are Supported?
Communication, diagnostics and automatic correction are separate functions. Confirm each function individually for the selected ECU and vehicle. Do not treat a general OBD-II description as a complete feature list.
Communication protocol: Confirm whether the supplied version supports the required CAN or K-line implementation.
Fuel-trim monitoring: Confirm access to short-term fuel trim and long-term fuel trim, commonly called STFT and LTFT.
Automatic correction: Confirm whether OBD-based gas correction is available, how it is enabled and its operating limits.
Fault-code functions: Confirm whether reading or clearing vehicle diagnostic trouble codes is supported. Do not assume these functions are included.
Gas-system diagnostics: Request the supported sensor, injector and controller fault list.
OBD support does not guarantee that the engine warning lamp will remain off. Faults require diagnosis of the vehicle, component selection, wiring and calibration. Clearing a fault code does not repair its cause.
Calibration should use the instructions for the exact ECU version. Read our injector rail and ECU calibration guide for related background information.
Will This ECU Match Your Engine and Components?
Compatibility requires more than a matching cylinder count. Confirm the original injection system, petrol injector signals, gas injector characteristics and sensor specifications.
Engine identification: Provide the vehicle make, model, year and engine code.
Original injection: Identify port fuel injection or direct injection. Request separate confirmation for GDI or TGDI engines.
Gas injectors: Confirm the injector model, coil resistance in Ω and ECU driver compatibility.
Sensors: Confirm pressure, temperature and MAP sensor models, ranges and signal characteristics.
Wiring: Check connector types, pin assignments, grounding and power-supply requirements.
Fuel configuration: Specify CNG or LPG and the installed regulator model.
Direct-injection applications need explicit engine-code support. Consult our GDI conversion guide before selecting a controller.
The ECU is one part of the gas conversion system. Review the conversion kit component guide when checking the complete configuration.
What Is Included in the ECU Price?
The quotation must distinguish an ECU unit from an ECU kit. Confirm supplied accessories and software access before comparing prices.
ECU model, hardware version and software version
Wiring harness and connector configuration
Pressure, temperature or MAP sensors
Changeover switch and related accessories
PC calibration interface or communication cable
Calibration software, license conditions and supported PC environment
Wiring diagram, installation instructions and technical support scope
Reducers and injector rails should be listed separately. Do not assume they are included in an ECU-only price. Confirm the quantities and models in the itemized offer.
Which Tests and Documents Should Buyers Request?
Test records should identify the model and acceptance criteria. A general statement such as “fully tested” does not establish the test method or result.
Power-supply testing: Test conditions and functional results across the specified operating-voltage range.
Input and output testing: Checks for injector control, sensor inputs and applicable switching outputs.
Communication testing: Supported protocols, software version and tested communication functions.
Temperature testing: Test profile, duration, operating state and acceptance criteria supporting the listed temperature range.
Electrical immunity and EMC: Applicable test standard, report reference and covered model, where claimed or required.
Traceability: Serial or batch reference, inspection date and inspection result.
ECU specifications alone do not establish vehicle emissions compliance. Applicable requirements depend on the vehicle, complete conversion configuration and destination market. Review our certification information and request documents covering the ordered model.
Frequently Asked Questions
Does this ECU support three-cylinder engines?
This page specifies a four-cylinder application. Request confirmation for the exact hardware and software version if you need three-cylinder support. Do not assume that all versions provide the same cylinder options.
Can it control both CNG and LPG systems?
CNG and LPG applications require matched hardware and calibration. Specify the intended fuel, regulator, injectors and sensors. ECU fuel selection does not make fuel-specific pressure components interchangeable.
Is PC software required for setup?
Dedicated calibration software is required for programmable setup. Confirm the software version, communication interface and supplied documentation. Installation and calibration should be performed by qualified personnel.
Will OBD-II automatically correct every running problem?
No. OBD functionality does not replace diagnosis. Engine condition, wiring faults, pressure problems, injector mismatch and incorrect calibration must be checked separately.
Can I order a replacement ECU only?
A replacement must match the existing installation. Send the current ECU label, connector photographs, wiring information and software details before ordering. A similar connector does not establish interchangeability.
Can I request OEM customization?
Customization requirements need technical review. Specify the requested branding, connector, housing or software changes. Confirm feasibility, minimum order quantity, validation requirements and lead time in the quotation.
Request a 4-Cylinder CNG/LPG ECU Quotation
Send application details for a compatibility review. Include the engine code, original injection type, required fuel, injector model, sensor models and required OBD functions.
Confirm the supply scope before ordering. State whether you need an ECU only, an ECU kit with accessories or a matched conversion component package. Include the destination country and quantity.
Contact SCYUNCHENG for a four-cylinder CNG/LPG ECU quotation
