U1000 2007 NISSAN PATHFINDER - CAN Communication Line - Signal Malfunction
- Controller Area Network (CAN) communication harness is open or shorted
- Faulty Engine Control Module (ECM)
- Poor harness ground connection.
Tech notesUsually the problem is poor harness ground connection.
There is a service bulletin for U1000 code:
Nissan Factory Service Bulletin Code U1000
The service bulletin suggests cleaning engine and body harness ground connection to repair problem.
When is the code detected?When ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) for 2 seconds or more.
- Engine Light ON (or Service Engine Soon Warning Light)
U1000 2007 Nissan Pathfinder DescriptionCAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
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