CPC/FR Axor Gear Speed Control Unit

The Mercedes-Benz OE 350709 is a control unit of the CPC/FR family (Fahrregelung). It is a network module that acts as an interface between driver commands, chassis systems and the driveline, calculating torque requests and managing vehicle driving functions by communicating with the engine ECU and other modules on the CAN network.

Technical specifications

• Type: CPC/FR control unit
• Vehicle power supply: 24 V (industrial vehicle application)

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Functions

• Calculation of the torque requested by the driver (primarily from accelerator position) and sending the request to the engine ECU.
• Torque limitation in specific conditions (for example safety/traction logics and compliance with the set speed limit).
• Determination and distribution of the vehicle speed signal to other systems via the network.
• Management of speed regulation functions (cruise and cruise with braking) with data exchange to brake modules (retarder where present).
• Management of enable/consent signals and information to the gearbox/transmission.
• Auxiliary driving-related functions, with plausibility monitoring and emergency strategies if signals or communications are missing.

Model applications

• Mercedes-Benz Axor

Common faults

• The CPC does not communicate with the diagnostic tool and prevents communication with other control units to which it is connected
• The engine does not rev up

Final conclusions

The Mercedes OE 350709 is a CPC/FR (Fahrregelung) control unit typical of the Mercedes Truck electronic architecture, commonly found on the Axor. It is central to driving management because it calculates the torque request, distributes vehicle signals, and coordinates speed regulation functions and network enable/consent.

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