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In-Vehicle Network - High Speed CAN communication faults
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Allan_T
 


Member Since: 10 Sep 2012
Location: Northampton
Posts: 1034

United Kingdom 2007 Discovery 3 TDV6 GS Auto Java BlackDiscovery 3
In-Vehicle Network - High Speed CAN communication faults





Measuring resistance between pins 6 & 14 on the DLC, CAN High and CAN Low. The CAN bus is terminated at either end with 120 Ohm resistors in parallel, the expected reading would be 60 Ohms.

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Channel 1 connected to CAN High and set to a 5V scale with 500 μs timebase and no trigger. Channel 2 connected to CAN Low with a 5V scale. CAN recessive state is 2.5V. The high & low signals will mirror each other with dominant values of 3.5V and 1.5V

Click image to enlarge






Click image to enlarge


Click image to enlarge


Now to identify which module is affecting the loop.
 GAP IID Pro Multi Vehicle Defender L316 2007-2015 - Discovery 3 - Discovery 4 - Discovery Sport L550 - Freelander 2 - Range Rover Evoque L538 - Range Rover L322 - Range Rover L405 - Range Rover Sport L320 - Range Rover Sport L494
Electrical Fault Diagnostics
 
 
Post #168640530th Jul 2016 9:23 pm
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andyhibs
 


Member Since: 06 May 2021
Location: Luton
Posts: 1

United Kingdom 2005 Discovery 3 3.0 TDV6 Base 5 Seat Auto Adriatic BlueDiscovery 3

Hi
Is there a way I can contact you regarding diagnostics of a L494 in Northampton?
  
Post #22285656th May 2021 11:13 am
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1771

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

This may help as I made it up whilst fault finding

Larger pdf version in my gallery under 190010 or this link
https://www.disco3.co.uk/gallery/albums/us...ions~4.pdf
  
Post #222948311th May 2021 8:04 am
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