TMT Translator TMT3978

• Seamless Integration: Designed to work right out of the box. It automatically detects the engine data and begins translating it immediately. No manual programming is required for standard applications.
• Comprehensive Data Mapping: Translates all critical engine parameters including Engine RPM, Coolant Temperature, Oil Pressure, Battery Voltage, Fuel Rate, and Transmission Oil Temperature.
• Error Code Translation: It doesn't just send gauge data; it also translates engine fault codes (DTCs), ensuring your older diagnostic displays or ELDs still report engine health accurately.
• CAI ToolBox Compatible: Equipped with a built-in USB port. Using our free CAI ToolBox Software, you can monitor live data traffic, troubleshoot wiring issues, and perform firmware updates in the field.
• Industrial Durability: Housed in a rugged, polycarbonate enclosure designed to handle the vibration and thermal stress of an engine bay. Rated for operation from -40°C to +80°C.
• Diagnostic LEDs: Features "at-a-glance" LED indicators for Power and Data Bus activity, making it easy to verify that the translator is communicating correctly with both the engine and the dashboard.

The TMT3978 is the go-to solution for engine "repower" projects or when installing modern engines into older chassis.

• Engines: Compatible with all modern SAE J1939-compliant engines (250K or 500K baud rates), including newer models from Caterpillar, Cummins, Detroit Diesel, PACCAR, and Volvo/Mack.
• Equipment: Ideal for older trucks (pre-2007) that are being retrofitted with newer engines but still utilize their original J1708/J1587 dashboards, cab controllers, or telematics devices.
• Electrical: Designed for use in both 12V and 24V vehicle electrical systems.

• Scan the databus for a complete list of available devices and parameters - Example Scan
• TMT3978 User Manual (PDF) – Detailed wiring schematics, pinout guides, and installation instructions.
• Full Translation Parameter List – A complete list of all J1939 SPN/PGNs translated to J1708/J1587 PIDs.
• CAI ToolBox Software – Download our free utility for PC-based diagnostics and device configuration.
• Technical Support – Reach out to our Stony Plain office for expert technical assistance.