Each control unit transmits/receives data but selectively reads required data only." property="og:description">
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OBDII Code List

U1000 2004 NISSAN MAXIMA - CAN Communication Line - Signal Malfunction

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

Usually the problem is poor harness ground connection.

There is a service bulletin for the following Nissan models with U1000 code:

2004 Nissan Maxima

Nissan Factory Service Bulletin Code U1000

The service bulletin suggests cleaning engine and body harness ground connection to repair problem.
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 2004 NISSAN MAXIMA 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 2004 Nissan Maxima - CAN Communication Line - Signal Malfunction - itimaster.ru

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U1000 2004 NISSAN MAXIMA 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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