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I need help. Car won’t run
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

I’m doing my absolute best to keep up also but more determined than ever to get to the bottom of this once and for all. I’ve ordered that canbus test box you said about. Looking for the test probe now also. I am determined to get better at this side of fault finding. I’m pretty good with boilers but cars are a whole new level. Big Cry
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #216357426th Jul 2020 5:03 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

gstuart wrote:
Hiya den

Respect my friend and can I say that lot went over my head Big Cry

Took a screen shot if that’s ok so can try and read it a few more million times to see if it clicks Thumbs Up

Really like learning new things , hats off to u mate as always with ur expertise Bow down


It might be about to go over my head too Gary Laughing
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #216357826th Jul 2020 5:15 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

U and me both Rolling with laughter

Indeed ref boilers , including the wiring which I have no problems tracing faults in heating systems and am the same with trying to learn as much as I can on these discos

tester , it’s made by sealey , plus the box having 2 x obd connectors u can plug ur iid in at the same time , just felt it makes life a lot easier using the box

U can use ordinary multimeter test leads for the box, don’t need the banana connections

Write up for test light

https://www.sealey.co.uk/product/563717531...eter-3-48v

Bought mine here

https://www.ffx.co.uk/tools/product/Sealey...164f672872

Hope that helps
   
Post #216358026th Jul 2020 5:18 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

PROFSR G wrote:
gstuart wrote:
Hiya den

Respect my friend and can I say that lot went over my head Big Cry

Took a screen shot if that’s ok so can try and read it a few more million times to see if it clicks Thumbs Up

Really like learning new things , hats off to u mate as always with ur expertise Bow down


It might be about to go over my head too Gary Laughing


Rolling with laughter ,

Can I take a guess on this please, so by putting one lead on the negative lead at the battery and the other on the various connections of the fuel pressure sensor are u therefore testing the resistance as it goes from one test probe to the other via the ECM please

Including looking for the canbus 5Vdc signal that comes from the ECM, does that sensor work like a thermistor as in the ohms change as the internal diaphragm changes as pressure changes

Plus , looking for the signal as it goes to the sensor then back to the ECM with the earth signal sharing each side of the wires , so need to ensure wires aren’t touching each other to short


Hope u don’t get a headache with me asking daft questions, lol

Thks as always
   
Post #216358826th Jul 2020 5:27 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Discomadness wrote:
Hi prof.
Ok retested. Here’s the figures. Didn’t realise my fluke auto ranges.


12.54v
Engine warm

Voltage on
White/green 4.9v
Brown/green 0.018
Yellow/green 5.0v

Voltage off
White/green 0v
Brown/green 0v
Yellow/green 0v

Continuity ign off
White/green 1.383
Brown/green beep .000
Yellow/green .190

Continuity short
W/g-br/g 1.384
Br/g-y/g nothing .189
W/g-y/g nothing 1.422


So that's looking better but still an anomaly of slightly lower resistance. Did you try the voltage test with the engine running? You may have to pierce the cables with a probe if the engine dies with the plug off.
I'm just wondering if there is partial or intermittent contact between W/G & Y/G but check the voltage as above first. You may in the end have to pull the ECM plug and test resistance between W/G & Y/G and the FRPS plug.

The readings with plugs out using the same ohms setting should be 000 on each individual wire. If you then try crossing one probe to another wire there should be no continuity unless the tested wires are shorting!
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #216359426th Jul 2020 5:48 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Also found this ref ECM connectors , hoping that it may be of use

Interesting about if software is updated that on the 15th time the ECM needs to be replaced


Click image to enlarge


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Click image to enlarge
  

Last edited by gstuart on 26th Jul 2020 6:18 pm. Edited 1 time in total 
Post #216360526th Jul 2020 6:15 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

I’ve just tested it with engine running. I unplugged it. Car had a fit but kept running. 5v on white/green and yellow/green. 0.015v on brown/green.
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #216360626th Jul 2020 6:16 pm
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wedgev8
 


Member Since: 17 May 2019
Location: Kerpen
Posts: 181

Germany 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

For all , Here are some information about the injection system. I have read this before fault searhing.

https://www.disco3.co.uk/gallery/displayim...&pos=1
  
Post #216360726th Jul 2020 6:17 pm
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wedgev8
 


Member Since: 17 May 2019
Location: Kerpen
Posts: 181

Germany 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Discomadness wrote:
I’ve just tested it with engine running. I unplugged it. Car had a fit but kept running. 5v on white/green and yellow/green. 0.015v on brown/green.


This is correct when unplugged. Please measure while plugged in and engine running.
Yellow/green should have 5V and White/Green should have 1 to 1.5V when idling.
Brown/Green is Signal earth or Mass.
  
Post #216361126th Jul 2020 6:45 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Discomadness wrote:
I’ve just tested it with engine running. I unplugged it. Car had a fit but kept running. 5v on white/green and yellow/green. 0.015v on brown/green.


Are you certain of these figures Jarrod? The voltage should be 5.0 volts on the supply side, and something like 0.5 v on the output side!

If you use the centre pin (No'2) of the plug as earth and with the ign on probe pins 1 and 3 you should see 5v on the supply terminal and 0.5 on the output back to the ECM. If both are reading 5v there is a short from the supply side to the output side before the signals reach the rail sensor.

EDIT:

With engine running and FRPS plugged in!
 yµ (idµ - eAµ) ψ=mψ

 


Last edited by PROFSR G on 26th Jul 2020 7:23 pm. Edited 1 time in total 
Post #216362326th Jul 2020 7:11 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Engine running wire stabbed

White green 1.007
Yellow green 4.98
Brown green 0.015
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #216362626th Jul 2020 7:20 pm
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wedgev8
 


Member Since: 17 May 2019
Location: Kerpen
Posts: 181

Germany 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Perfect!
And your fault Codes and limb mode???
  
Post #216362726th Jul 2020 7:24 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

No limp mode as yet but that injector I’ve changed hasn’t trimmed in yet. They take about 100 miles or so. This one crops up though but no limp.


EDIT:
I’ve been taking some of the tape off the harness to test and found a few stab holes in cables probably from someone’s attempt to get to the bottom of this or other faults previously. The rail pressure sensor has white paint on it as a breaker would use.
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #216362926th Jul 2020 7:28 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

I can't see anything wrong with that, Y/G is the supply side so 4.98 is good. W/G is the signal back to the ECM and this will fluctuate depending on throttle position and load to a max of around 1.5 v I think.

So if the ECM is seeing a spike in the return voltage, why and where is it coming from?

I can only suggest the two wires have chaffed somewhere between the FRPS and the ECM and are perhaps
making an intermittent contact. Or, further back in the loom towards the ECM the same chaffing has occurred between the W/G and another wire. Big Cry
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #216363026th Jul 2020 7:32 pm
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Discomadness
 


Member Since: 19 Jan 2015
Location: Caerphilly
Posts: 2256

Wales 2007 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

I’m finding stab holes and scrapes/cuts to the insulation all over the loom. Big Cry
 Jarrod

Current : D3 2007 HSE - AKA the lemon
-beanie grille
-detango with led bulbs
-club body off rebuild. TWICE. 
 
Post #216363126th Jul 2020 7:39 pm
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