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DTC - Diagnostic Trouble Codes information

U1011

Communication Codes

U1011 - NISSAN - Invalid or Missing Data for Engine Air Intake

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Harness or connectors (CAN communication line is open or shorted) - ECM

When Detected

When detecting error during the initial diagnosis of CAN controller of ECM.

Tech Notes

Nissan has release service bulletins for this problem. A common cause with Nissan vehicles is the poor harness ground connection at the engine compartment and the ground connection behind the dash. Clean and resecure harness ground connection and reset engine light.

Description

CAN (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.