JBtuned Flex Fuel Sensor Harness for Hondata S300 V3 / KPro4

Product Description

The JBtuned Flex Fuel Sensor Harness for Hondata S300 V3 / KPro4 provides the wiring needed to connect a compatible Continental ethanol-content sensor directly to supported Hondata engine-management hardware.

Each harness is built specifically for the selected Hondata version so the sensor signal is configured correctly for either S300 V3 or KPro4.

This harness is designed for use with the Genuine Continental 13577429 Flex Fuel / Ethanol Content Sensor.

Quick Specifications

• Product Type: Flex fuel / ethanol-content sensor wiring harness
• Sensor Application: Continental 13577429 ethanol-content sensor
• ECU Options: Hondata S300 V3 or Hondata KPro4
• Harness Length: Approximately 8 feet
• Wire: Tefzel Mil-Spec wire
• Sensor Connector: New connector, terminals, and seals
• S300 V3 Version: Integrated 2.4 kΩ pull-up resistor
• KPro4 Version: No external pull-up resistor required
• Optional Sensor Fittings: -6AN sensor fittings available

Choose the Correct Hondata Version

The S300 V3 and KPro4 versions of this harness are electrically different. Select the version that matches the Hondata hardware installed in your vehicle.

Hondata S300 V3

Hondata S300 V3 can read the frequency signal from a compatible ethanol-content sensor directly through Analog Input 0.

Hondata requires a 2.4 kΩ pull-up resistor between the sensor output and Vcc when the sensor is connected directly to S300 V3.

The JBtuned S300 V3 harness has this required resistor built into the harness, eliminating the need for the installer to add the resistor separately.

This version requires S300 V3. It is not intended for earlier S300 hardware versions.

Hondata KPro4

Hondata KPro4 includes a dedicated ethanol-content sensor input and has the required 2.4 kΩ pull-up resistor built into the KPro hardware.

Because the resistor is already present in KPro4, the JBtuned KPro4 harness does not add another pull-up resistor to the circuit.

Hondata currently specifies native flex-fuel operation for KPro4 using a PRB or PRA calibration. Verify the calibration and ECU configuration being used before installation.

This version requires KPro4. It is not intended for earlier KPro hardware versions.

Designed for the Continental 13577429 Sensor

The harness uses the correct sensor-side connection for the Continental 13577429 Flex Fuel / Ethanol Content Sensor used throughout compatible JBtuned flex-fuel systems.

The sensor produces a frequency-based signal representing the ethanol content of the fuel. Compatible Hondata hardware interprets that signal and makes the ethanol-content value available to the ECU's flex-fuel strategy.

The harness provides the electrical connection. The sensor, ECU configuration, and calibration each perform separate functions within the complete flex-fuel system.

Built-In S300 V3 Pull-Up Resistor

One of the main differences between the two harness versions is the pull-up resistor required by the sensor signal circuit.

For S300 V3, Hondata requires a 2.4 kΩ resistor between sensor Vcc and the sensor output signal. JBtuned builds this resistor into the S300 V3 harness so the customer does not need to source, wire, and protect the resistor separately.

For KPro4, Hondata has already incorporated the pull-up resistor into the ethanol input on the KPro board, so the KPro4 harness is built without an additional resistor.

8 Feet of Tefzel Mil-Spec Wire

The harness is built with approximately 8 feet of Tefzel Mil-Spec wire, providing enough length for the sensor to be mounted away from the ECU while allowing the wiring to be routed cleanly through the vehicle.

Tefzel wire is well suited for automotive wiring because of its durable insulation and resistance to the heat, moisture, oils, fuels, and chemicals commonly encountered in vehicle environments.

New Connector, Terminals & Seals

Each harness is assembled with new sensor-side connector components, terminals, and seals rather than reusing cut or salvaged wiring.

This provides a clean connection at the Continental sensor and allows the harness to be incorporated into the vehicle's wiring without relying on an old donor pigtail.

Basic Sensor Wiring

The Continental ethanol-content sensor uses three electrical circuits:

• Vcc / Red: Switched +12V power
• Ground / Black: Sensor / ECU ground
• Output / White: Ethanol-content signal to the compatible Hondata input

For S300 V3, the sensor signal is connected to the appropriate Analog Input 0 circuit. For KPro4, use the Hondata ethanol-content input according to the applicable KManager wiring and configuration instructions.

Always verify the current Hondata wiring documentation for your ECU hardware and calibration before making electrical connections.

No External Ethanol Analyzer Required for Supported S300 V3 / KPro4 Setups

One of the benefits of supported S300 V3 and KPro4 configurations is that the compatible Continental sensor can be read directly by the Hondata hardware.

An external frequency-to-voltage ethanol-content analyzer is not required when the sensor is connected using Hondata's supported direct frequency-input configuration.

This harness is specifically designed around that direct sensor-to-Hondata arrangement.

Not a Universal FlashPro Harness

This product is specifically for Hondata S300 V3 and KPro4.

Hondata FlashPro flex-fuel configurations vary by vehicle and may require an ethanol-content analyzer with a 0-5V output or Hondata CANFlex rather than the direct sensor-frequency connection used by S300 V3 and KPro4.

If your vehicle uses FlashPro, verify the requirements for your exact vehicle and ECU before ordering this harness.

Building a Complete Flex Fuel Sensor Setup?

The wiring harness is one part of the complete sensor installation. JBtuned also offers the related fuel-system components needed to install and support the Continental sensor:

• Genuine Continental 13577429 Flex Fuel / Ethanol Content Sensor
• e85Freaks Continental Flex Fuel Sensor Quick-Connect Fittings to -6AN
• JBtuned Flex Fuel Sensor Mounting Bracket
• e85Freaks 350 Series PTFE Fuel Hose

Optional -6AN Sensor Fittings

If you also need the fuel-system connections for the Continental sensor, the -6AN Flex Fuel Sensor Fittings can be added when ordering the harness.

Two fittings are required to provide -6AN connections on both sides of one sensor.

The fittings are also available separately for customers who already have the sensor and harness.

A Wiring Harness Does Not Make the Vehicle Flex Fuel by Itself

This harness allows a compatible ethanol-content sensor to communicate with supported Hondata hardware, but the wiring alone does not create a complete flex-fuel system.

A functioning sensor-based flex-fuel setup also requires:

• A compatible ethanol-content sensor
• Appropriate fuel-system plumbing
• Supported ECU hardware and software
• Correct ECU input configuration
• A properly configured flex-fuel calibration
• Professional tuning appropriate for the vehicle and fuel system

The sensor measures ethanol content, the harness carries the signal, and the ECU calibration determines how that information is used.

What Is Included?

• One JBtuned flex fuel sensor wiring harness for the selected Hondata version
• Continental sensor-side connector, terminals, and seals
• Approximately 8 feet of Tefzel wire
• Integrated 2.4 kΩ pull-up resistor on the S300 V3 version only

Flex fuel sensor, -6AN sensor fittings, mounting bracket, fuel plumbing, ECU hardware, and tuning are not included unless selected separately.

Installation Notes

Route the harness away from exhaust components, sharp edges, moving parts, and other sources of heat or abrasion.

Secure the wiring at appropriate intervals and protect any areas where the harness passes through sheet metal or other potentially damaging surfaces.

After installation, confirm that the sensor is receiving power and that the ethanol-content signal is being read correctly by the Hondata software before enabling or tuning flex-fuel compensation.