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Home >> Chevrolet >> 2016 >> Express 2500 Base, Van Cargo Extended, 6.6L Eng VIN L >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U1865: Fuel Operated Heater Lost Communication with Engine Control Module >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2015 GMC Savana 3500, 2015 GMC Savana 2500, 2015 Chevrolet Express 3500, and 2015 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Control modules connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the control modules. The control modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module.

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