Symptoms

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

Possible Causes

- Harness or connectors (CAN communication line is open or shorted) - Faulty Engine Control Module (ECM)

When Detected

When ECM is not transmitting or receiving CAN communication signal of OBD (emission related diagnosis) for 2 seconds or more.

Tech Notes

There is a service bulletin for the following Infiniti models with U1010 code: 2002-2004 Infiniti I35 2002-2006 Infiniti Q45 2004-2006 Infiniti QX56 2003-2006 Infiniti FX 2003-2006 Infiniti G35 2003-2004 Infiniti M45 2006 Infiniti M Infiniti Service Bulletin Code U1000 Service bulletin suggest cleaning engine and body harness ground connection to repair problem. There is another Infiniti service bulletin with tips to diagnose the U1010 code: Infiniti Service Bulletin Code U1010 Diagnostic Tips and Guidelines

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.