HOW TO diagnose diesel starting problems

FrenchMike · 1st April 2012, 08:04

For people who can’t access a T4 or in case of intermittent issue.
( This supposes a healthy battery , a running starter , plenum drains clear and chamber dried).

The main sensors can be read using a low cost multimeter.
The measured values tell what is to be ruled out and so saving time and money.

-CAMSHAFT signal (acts only at starting)
This rectangular waveform varies from 0 to +batt can be ‘estimated’ as a DC voltage.

Camshaft info test.jpg

-CRANKSHAFT Info check :
simply notice if the tachometer needle move slightly while cranking attempt.

-LOW PRESSURE gasoil line (includes intank +inline pumps +fuel filter and sensor.)

BP test.jpg

In case of low value,Pumps have to be suspected firstly.

-HIGH PRESSURE fuel common rail line (includes High pressure pump , regulator ,injectors and sensor)

HP test.jpg

In case of low values,an injector leakback test is recommanded.

Check the HP pump regulator gaskets as well.

-MAF signal normal values

MAF test.jpg

-To pick easily through the wire insulator try to make this little tool:

pickup (2).jpg

Hoping it helps..

Mike

COLVERT · 1st April 2012, 10:02

Thanks Mike.

Copied to my 'HOW TO' book.

Colvert.

HarryM1BYT · 1st April 2012, 10:29

Thanks Mike - I wonder if that could be made more comprehensive with the Easystart tips and injector leakback testing information?

Basically I was thinking how very useful it could be, if everything for the diesel were in one single document.

Have you also done some similar checks on the MAP sensor and the temperature sensor (might only have been fitted to the later diesels, its just before the EGR)?

FrenchMike · 1st April 2012, 11:29

Quote:

Originally Posted by HarryM1BYT

Thanks Mike - I wonder if that could be made more comprehensive with the Easystart tips and injector leakback testing information?

Basically I was thinking how very useful it could be, if everything for the diesel were in one single document.

Have you also done some similar checks on the MAP sensor and the temperature sensor (might only have been fitted to the later diesels, its just before the EGR)?

Harry,

I only considered the 'electric' side ; effecively one can add a link to
the hydraulic side ;Easystart,injectors leackback etc..
About the MAP sensor , rarely an issue has been reported and ...the access is more difficult .

On mine (2002), i haven't EGR temperature sensor fitted...

Mike

Dragrad · 26th August 2012, 23:44

OP copied to the How To forum

http://www.the75andztclub.co.uk/foru...d.php?t=198234

FrenchMike · 27th August 2012, 06:26

Quote:

Originally Posted by Dragrad

OP copied to the How To forum

http://www.the75andztclub.co.uk/foru...d.php?t=123081

Thanks for all of us Andrew;

but what happended to the pictures ?

Dragrad · 27th August 2012, 13:59

Quote:

Originally Posted by FrenchMike

Thanks for all of us Andrew;

but what happended to the pictures ?

They are all there from what I can see

twaters63 · 27th August 2012, 14:05

Not sure but the pics are not showing for me either they are on the original thread Dragrad?

Dragrad · 27th August 2012, 14:14

OK I've re-hosted the pics, I can see them, just hope I got them on the right order

FrenchMike · 27th August 2012, 14:40

Quote:

Originally Posted by Dragrad

OK I've re-hosted the pics, I can see them, just jope I got them on the right order

The order is good but the first (camshaft sensor test) is missing

1st April 2012, 08:04	#1
FrenchMike This is my second home Rover 75 Saloon Join Date: Aug 2007 Location: Avignon Posts: 4,466 Thanks: 94 Thanked 661 Times in 554 Posts	HOW TO diagnose diesel starting problems For people who can’t access a T4 or in case of intermittent issue. ( This supposes a healthy battery , a running starter , plenum drains clear and chamber dried). The main sensors can be read using a low cost multimeter. The measured values tell what is to be ruled out and so saving time and money. -CAMSHAFT signal (acts only at starting) This rectangular waveform varies from 0 to +batt can be ‘estimated’ as a DC voltage. Camshaft info test.jpg -CRANKSHAFT Info check : simply notice if the tachometer needle move slightly while cranking attempt. -LOW PRESSURE gasoil line (includes intank +inline pumps +fuel filter and sensor.) BP test.jpg In case of low value,Pumps have to be suspected firstly. -HIGH PRESSURE fuel common rail line (includes High pressure pump , regulator ,injectors and sensor) HP test.jpg In case of low values,an injector leakback test is recommanded. Check the HP pump regulator gaskets as well. -MAF signal normal values MAF test.jpg -To pick easily through the wire insulator try to make this little tool: pickup (2).jpg Hoping it helps.. Mike Last edited by FrenchMike; 8th February 2016 at 13:22.. Reason: Pics enlarged

1st April 2012, 10:29	#3
HarryM1BYT This is my second home 75 Contemporary SE Mk II 2004 Man. Sal. CDTi 135ps, FBH on red diesel, WinCE6 DD Join Date: May 2010 Location: Leeds Posts: 17,273 Thanks: 2,160 Thanked 2,061 Times in 1,586 Posts	Thanks Mike - I wonder if that could be made more comprehensive with the Easystart tips and injector leakback testing information? Basically I was thinking how very useful it could be, if everything for the diesel were in one single document. Have you also done some similar checks on the MAP sensor and the temperature sensor (might only have been fitted to the later diesels, its just before the EGR)? __________________ Harry How To's and items I offer for free, or just to cover the cost of my expenses... http://www.the75andztclub.co.uk/foru...40#post1764540 Fix a poor handbrake; DIY ABS diagnostic unit; Loan of the spanner needed to change the CDT belts; free OBD diagnostics +MAF; Correct Bosch MAF cheap; DVB-T install in an ex-hi-line system; DD install with a HK amp; FBH servicing. I've taken a vow of poverty. To annoy me, send money. Last edited by HarryM1BYT; 1st April 2012 at 10:32..

26th August 2012, 23:44	#5
Dragrad This is my second home *None DROWNED** Join Date: Aug 2007 Location: Cardigan Posts: 33,339 Thanks: 1,257 Thanked 1,664 Times in 1,081 Posts	OP copied to the How To forum http://www.the75andztclub.co.uk/foru...d.php?t=198234 __________________ Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER... Last edited by Dragrad; 1st November 2015 at 23:15.. Reason: link amended

27th August 2012, 14:05	#8
twaters63 Avid contributor Rover 75 Saloon Join Date: Aug 2011 Location: Seaham Posts: 173 Thanks: 0 Thanked 1 Time in 1 Post	Not sure but the pics are not showing for me either they are on the original thread Dragrad? __________________ [SIGPIC][/SIGPIC] Mods: XPower Upgrade;Ambient lighting;Bonnet Cable Mod;Walnut Dash;Illuminated Visors;Radioguy DD with DVB-T and Reversing Camera; Just starting FBH

27th August 2012, 14:14	#9
Dragrad This is my second home *None DROWNED** Join Date: Aug 2007 Location: Cardigan Posts: 33,339 Thanks: 1,257 Thanked 1,664 Times in 1,081 Posts	OK I've re-hosted the pics, I can see them, just hope I got them on the right order __________________ Andrew Ich Dien Problem solving is... lateral thinking SEARCH FIRST ...ASK LATER... Last edited by Dragrad; 27th August 2012 at 22:12..

1st April 2012, 10:02	#2
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Thanks Mike. Copied to my 'HOW TO' book. Colvert.