Each control unit transmits/receives data but selectively reads required data only." property="og:description">
For Shop Owners

U1000 INFINITI - CAN Communication Line - Signal Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Controller Area Network (CAN) communication harness is open or shorted
  • Faulty Engine Control Module (ECM)
  • Poor harness ground connection.
What does this mean?

Tech notes

There is a factory service bulletin for the following Infiniti models:
- 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

Service bulletin suggests cleaning engine and body harness ground connection to repair the problem.
- Clean/re-tighten ECM ground connections.
- Clean/re-tighten negative battery cable body connection and battery post connection.
- If needed, clean and ensure good contact between the steering member assembly and the left side instrument stay assembly.

There is another Infiniti service bulletin with tips to diagnose the U1000 code:

What does this mean?

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.

Possible symptoms

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

U1000 INFINITI 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.

OBDII Code U1000 Infiniti - CAN Communication Line - Signal Malfunction - itimaster.ru

U1000 INFINITI Information for specific Infiniti models

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U1000 INFINITI Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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