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Old 6th September 2019, 20:32   #1
david2000
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Default rover 75 diesel wont start

hi to all
this morning I started the engine then after 30 seconds it stopped and would not start under bonnet pump is working and good pressure then I asked a friend to give me a hand he came over and he loosened the nut on the common rail and I cranked the engine diesel was coming out then he loosened the nut on the injector I cranked the engine diesel coming out then he suggested connecting another injector to the common rail I had a injector so we connected the injector and cranked the engine nothing so it looks like there is no power going to the injectors can anyone help
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Old 6th September 2019, 21:07   #2
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Dead cam sensor.

PS. Be very, very careful with the high pressure injector feed. Oil can penetrate your skin and kill you.----
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Old 6th September 2019, 21:12   #3
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Quote:
Originally Posted by david2000 View Post
hi to all
this morning I started the engine then after 30 seconds it stopped and would not start under bonnet pump is working and good pressure then I asked a friend to give me a hand he came over and he loosened the nut on the common rail and I cranked the engine diesel was coming out then he loosened the nut on the injector I cranked the engine diesel coming out then he suggested connecting another injector to the common rail I had a injector so we connected the injector and cranked the engine nothing so it looks like there is no power going to the injectors can anyone help
david
Fault codes? live data? you have a T4, so you will be aware the common rail pressure is circa 19500 KPa while cranking or 2800 P.S.I. and fuel at this pressure will inject through your skin and kill you

So what are the fault codes (if any) and what are the live data figures for the LP and HP side, regulator current etc.

Brian
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Old 6th September 2019, 22:00   #4
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hi brian
I cant give you live data the engine wont start the fault on the ecu is pre delivery pressure monitoring how can I test to see if there is power going to the injectors
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Old 6th September 2019, 22:29   #5
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Engine doesn't need to be running David, LP side must be > than 125Kpa, and the HP side >14000Kpa during cranking.

If the LP is <125KPa, the ECM inhibits injector operation to prevent HP pump damage

Brian
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Old 6th September 2019, 22:59   #6
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hello Brian
ok so I need to have the overview screen on the t4 then crank the engine and see the readings is this correct I shall try tommorow
I have one question does the camshaft sensor send a signal to the injectors via ecu
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Old 6th September 2019, 23:43   #7
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Your question.----I believe it does.

Brian will have an answer for you tomorrow.---
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Old 7th September 2019, 08:28   #8
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Quote:
Originally Posted by david2000 View Post
hello Brian
ok so I need to have the overview screen on the t4 then crank the engine and see the readings is this correct I shall try tommorow
I have one question does the camshaft sensor send a signal to the injectors via ecu
david
The ECM will reference the camshaft sensor signal only at start up and if it doesn't see it then it will not fire the injectors.

For injector timing the ECM uses the crankshaft sensor.






.

Last edited by Mike Noc; 7th September 2019 at 08:33..
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Old 7th September 2019, 10:00   #9
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Yes David, as Mike says the CMP is used solely to reference the first injection cycle then is disregarded.

The overview screen should be viewed during the cranking phase to determine the high pressure figures are correct.

I don't know if your T4 is of the variety with a kettle lead connector like this......



If it is, you should power it from the mains to prevent the possibility of signal dropout during cranking.

Brian
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O ring failure guide HERE an invaluable guide to O ring failure modes, that don't include nonsense about positioning of clips on KV6 thermostat pipework
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Old 7th September 2019, 10:46   #10
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hello Brian
I have sent you a photo of my t4 check your email and in the next half hour I will have the info you want
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