Question about 2005 Nissan Murano

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Code u1000 computer area network. I hear the ground to the ecm is a common problem on the murano. Where is the ecm located? Does the entire dash need to come out?

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SOURCE: code u1000 on 05 nissan

not realy. frist try and disconnect the battery and hold the psotive and negative battery terminals togheter while they are both disconnected from the battery for 5 minutes then retest and see what you get.

Posted on Jul 02, 2011


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1 Answer

Code U1000

No communication between the electronic control unit and the controller area network. Code usually precedes a more specific code showing the area of communication breakdown within the vehicle. Can be an open or short. Can be ground or component related.

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You need to have the transmission check for codes and operation concerns.

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Check your Speed sensor, Idle air control valve, then check your Accelerator Cable that attaches to the back of your (gas pedal) going to your throttle body.

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2004 nissan maxium code u1000

Trouble Code: U1000

Controller Area Network Line Malfunction

Possible Causes:

CAN connector is damaged or is disconnectedCAN communication line is open, shorted to ground or to powerOne of the modules is shorted and pulling the CAN voltage low

Jan 27, 2013 | 2004 Nissan Maxima

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Main Problem: code reader scanner unable to connect to vehical computer. Vehical is also not starting has some issue with fuel delivery I believe. Motor turns over, has spark, I do not hear fuel pump going...

Well, I don't know about the "cert.GM tech", but the WIRING DIAGRAMS for your vehicle say that there are 4 ground circuits for your Powertrain Control Module (PCM) They are pins 16, 56, 57, and 60 in connector 1 at the PCM. They all have the same grounding point: G110 which is located just to the left of the starter on the transmission bell housing. Your negative battery cable grounds there also. Incidently, the grounds for the fuel pump relay and the ignition control module also originate from this point. (You will find several wires bolted to the transmission here.) Actually, it will be a special bolt in the transmission bell housing bolt with a stud made onto it and a 15mm nut will be holding all the wire terminals to the bolt.

With all that said, if I had a PCM that would not communicate with a code reader, the VERY FIRST thing I would check would be the Cigarette Lighter fuse. It is located in the fuse block in the right end of the dash. It is marked "CIGAR/DLC" and is a 15 Amp fuse. If this fuse is blown, unplug whatever you have plugged into the cigarette lighter before replacing it. It is very common for ths fuse to be blown as a result of defective phone chargers and laptop computer power supplies, etc.

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U1000 - CAN Communication Line Signal Malfunction

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

- Poor harness ground connection

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

2002-2006 Nissan Maxima
2004-2006 Nissan Titan
2004-2006 Nissan Armada
2002-2006 Nissan Sentra
2005-2006 Nissan Frontier
2002-2006 Nissan Altima
2005-2006 Nissan Xterra
2005-2006 Nissan Pathfinder
2004-2006 Nissan Quest
2003-2006 Nissan 350Z
2003-2006 Nissan Murano

The service bulletin suggest cleaning engine and body harness ground connection to repair problem.

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2 Answers

Trouble code u1000 on nissan titan

DTC (Diagnostic Trouble Code) U1000 is a problem with the CAN communication line.
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

This DTC sets under the following conditions:

The ECM (Engine Control Module) has lost communications with one or more of the onboard control units for a specified amount of time.

To diagnose this code you must scan all the other modules to see if they can communicate with the scanner. If all the modules are able to communicate with the scanner then the problem is intermittent and can be very hard to find. If you have one or more modules that fail to communicate then the problem is the data line to that (those) module(s).

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Have you done any component testing? U1000 is a data issue, cant read pulses per minute. This is usually due to a defective crank sensor but you should do component testing first so you don't replace parts on random. Other reasons for this failure can be faulty ignition switch cam positioning sensor, Blown fuse, bad ground, or ECM.

Jun 16, 2009 | 2001 Saturn SC

1 Answer

02 ultima troble codes u1000 u1001

These 2 codes indicate a communications problem within the CAN (Controller Area Network). The CAN network malfunction per Chilton lists 3 possible causes:
  • CAN connector is damaged or is disconnected
  • CAN communication line is open, shorted to ground or to power
  • One of the modules is shorted and pulling the CAN voltage low
I hope this helps narrow down your problem. Best of luck to you.

May 09, 2009 | Nissan Altima Cars & Trucks

2 Answers

Engine codes

sometimes coming data,but the every error comunication,for the scannner
rpm up and down same the lightgauge,low high,codes u 1001 1000

Jan 15, 2009 | 2002 Nissan Altima

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