When more than one critical parameter does not have an identification number associated with it, the code will only set once. Attempt to communicate with each module on the class 2 serial data circuit. Turn ON the ignition leaving the engine OFF. When a module does not associate an identification number with at least one critical parameter within 5 seconds of starting data communication, DTC U1000 or U1255 is set. DTC U1000 and DTC U1255 Class 2 Communication Malfunction Step Action Yes No 1 Did you record any DTCs in the range of U1001-U1199 with a history status Go to Diagnostic Trouble Code (DTC) List Go to Step 2 2 1. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. These Node Alive messages are used for State of Health monitoring. When a module receives a message for a critical operating parameter, the module records the identification number of the module that sent the message. Operating information and commands are exchanged among the modules. CAN (Controller Area Network) is a serial communication line for real-time applications. Class 2 Communication Failure Conditions Infiniti: CAN Link - Signal Fault Isuzu: Link ID class 2 not found Nissan: CAN communication circuit. Saturn DTC U1000 Make: Saturn Code: U1000 Definition: Class 2 Communication Malfunction Description: Modules connected to the Class 2 circuit monitor for serial data communications during normal vehicle operation. Usually the problem with the U1000 on Nissan is a bad wiring ground.
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