The Haltech Elite series ECUs offer extensive flexibility in data communication and device integration. This guide focuses on utilizing the CAN bus capabilities of the Elite, specifically converting Haltech DTM4 CAN data to OBDII for broader compatibility with diagnostic tools and applications.
Understanding Haltech CAN and OBDII
The Haltech Elite utilizes a Controller Area Network (CAN) bus system for high-speed communication between various components, including sensors, actuators, and displays. The DTM4 connector provides a dedicated interface for connecting to the CAN bus. On the other hand, OBDII (On-Board Diagnostics II) is a standardized system for vehicle diagnostics, allowing external devices to access engine and emissions-related data. Bridging the gap between these two systems allows for seamless data monitoring and troubleshooting.
Configuring the Haltech Elite for OBDII Output
The Elite ECU can be configured to output OBDII data over its CAN bus system. This functionality is accessed through the “Device” tab within the Main Setup Menu (F4 key or click on “Setup”). Within this tab, you can enable and assign CAN inputs and outputs to either the Main connectors or the Auxiliary CAN Bus Port, which uses the included 4-pin DTM4 connector.
Choosing the appropriate port depends on your specific application. The Main Connectors, located on pins B23 and B24 of the small connector, allow for a cleaner installation with the pocket cover in place, maintaining the ECU’s waterproof integrity. The Auxiliary CAN Bus Port, with its dedicated DTM4 connector, offers more flexibility for custom wiring configurations.
OBDII Data Channels Supported by Haltech Elite
The Haltech Elite supports a comprehensive range of OBDII data channels, adhering to international standards. This allows for compatibility with most standard OBDII scan tools and third-party applications on iPhone/Android devices. The following table details the specific PIDs (Parameter IDs) and their corresponding data:
Request Diagnostic Data:
| PID | Description | Prerequisite |
|---|---|---|
| 0x05 | Engine Coolant Temperature | Sensor Enabled |
| 0x06 | Short Term Fuel Trim Bank 1 | O2 Control Bank 1 |
| 0x07 | Long Term Fuel Trim Bank 1 | O2 Control Bank 1 with long term |
| … | … | … |
| 0x5C | Engine Oil Temperature | Sensor Enabled |
This extensive list allows for monitoring critical engine parameters, including temperatures, fuel trims, pressures, RPM, speed, and more. Note that certain data points require the corresponding sensors to be enabled within the Haltech software.
Additional CAN Device Integration
Beyond OBDII, the Haltech Elite’s CAN bus capabilities extend to a wider array of devices:
- Haltech CAN Supported Dashes: Enable communication with compatible Haltech dashes for real-time data visualization.
- Input/Output Expander Boxes: Expand the Elite’s I/O capabilities by connecting to Haltech I/O boxes via the CAN port or Haltech CAN Hub.
- Thermocouple Amplifier Boxes: Integrate thermocouple sensors for precise temperature monitoring. Various TCA models are supported, offering flexibility in the number of channels.
- Wideband Controller Boxes: Connect wideband O2 sensors for accurate air/fuel ratio monitoring and closed-loop control. Single and dual-channel WBCs are supported.
- Race Expansion Modules: Utilize the REM for advanced features and additional inputs/outputs.
Conclusion
The Haltech Elite’s versatile CAN bus system and DTM4 connector, coupled with its ability to output OBDII data, provide a powerful platform for comprehensive vehicle monitoring and control. By understanding the configuration options and supported devices, you can harness the full potential of the Haltech Elite for your specific application.
