Rover 75 Diesel Not Starting - Page 2

Davy · 14th March 2016, 21:19

EP stands for emergency program where i think the ecu stops the fuel pump relay from operating to stop damage to the engine or gearbox.the best people to ask about this are either marinabrian or big russ.

Davy

marinabrian · 14th March 2016, 22:05

Quote:

Originally Posted by British icons

Hi Guys,

Thank you for all your tips, here is the latest I can say:

The new fuel Pumps will prime with 12v direct but not priming normally.

The Relay I swapped with the other 201 in the fuse box.

The R5 relay has the 2 wires for inertia which are live (Brown/L Green + Purple/L green)
The Black/Purple (ECM) wire is live but the White /Purple to the pumps have no feed...

ECU was sent away and NFF.

Under the Bonnet fuse box removed and although the wires are covered in dirt the plugs are spotless.

Conclusion for me is either both the 201 relays are no good or the ECM is not sending the signal (but the wire is live?)

Am I missing something?

Thanks again for your help

Have a look HERE failing that, send your ECM to somebody who knows how to test it properly

Brian

British icons · 15th March 2016, 09:50

Can anyone tell me if the ECM wire to the relay has power is the ECM sending the signal?
or is it permanent live and power cut for priming pumps?

Thank you

British icons · 15th March 2016, 13:07

EP is showing on the dash, does this mean it could be anything, T4 time?

Davy · 15th March 2016, 13:26

could be similar to this http://www.the75andztclub.co.uk/foru...d.php?t=119222
Check the first and last posts but then again it may be another problem. I think one of the t4 experts is required here

Davy

SD1too · 15th March 2016, 20:12

Quote:

Originally Posted by British icons

The R5 relay has the 2 wires for inertia which are live (Brown/L Green + Purple/L green)
The Black/Purple (ECM) wire is live but the White /Purple to the pumps have no feed...

Peter,

The inertia switch feeds battery voltage to the fuel pump relay coil. You say that is live: good.

The black/purple is the other side of the relay coil which should be earthed by the ECM. You say it is live. That means that the ECM is not earthing it. That appears to be the problem.

The WP wire to the pumps isn't live because the relay isn't being energised.

Simon

marinabrian · 16th March 2016, 00:25

Peter, if the wiring checks out as per my how too I linked to, then it looks increasingly like an ECM fault.

EP in the display is a result of the ECM not communicating on the CANBUS with the Jatco autobox ECU.

This is how it works, once initialised the ECM outputs a low signal from pin 10 of connector 331, via a black/purple wire to one side of the fuel pump relay pull in coil, thus energising the relay contacts.

The fuel pumps will now run.

However for some reason your ECM isn't initialising, so you need to check to see if you have continuity from pin 9 of connector 371 to the pull in coil of the main relay in the engine compartment fusebox (Terminal 85 black/pink wire), and also the presence of 12 volts at pin 1 of CO371 (yellow/red).

Also check fuses one and two in the engine compartment fusebox (the top two of the blade fuses)

Brian

British icons · 22nd March 2016, 18:57

Thanks again guys, just back home after a few days away. I will check these tomorrow

binraider · 23rd March 2016, 07:14

Hi there - you checked the plugs that go into the fusebox:

Under the Bonnet fuse box removed and although the wires are covered in dirt the plugs are spotless.

On my CDT the problem was not the plugs going in but was that two very thin wires had broken inside the plastic sheathing but they were still in "one piece" so to speak - only by looking very closely could you see that there was something not right about them - they both had a "bendy bit" in them. Most of the wires are much thicker so probably are not susceptible to the problem

British icons · 12th April 2016, 18:13

First of all, thank you to everyone for your help, pin 9 to main relay was a corroded wire inside the sleeve, looked like a pin size hole through the insulation tape and sleeve, wire was corroded approx 5mm inside.

Fuel pump running
EP off on dash
Fuel at filter and common rail

Still wont start, ...........

14th March 2016, 21:19	#11
Davy Avid contributor suzuki vitara Join Date: Jun 2008 Location: Glasgow Posts: 228 Thanks: 498 Thanked 47 Times in 42 Posts	EP stands for emergency program where i think the ecu stops the fuel pump relay from operating to stop damage to the engine or gearbox.the best people to ask about this are either marinabrian or big russ. Davy __________________ I am not a number i am a free man.

15th March 2016, 09:50	#13
British icons Regular poster Rover 75 Touring Join Date: Dec 2015 Location: Norwich Posts: 40 Thanks: 45 Thanked 0 Times in 0 Posts	75 Not starting still Can anyone tell me if the ECM wire to the relay has power is the ECM sending the signal? or is it permanent live and power cut for priming pumps? Thank you

15th March 2016, 13:07	#14
British icons Regular poster Rover 75 Touring Join Date: Dec 2015 Location: Norwich Posts: 40 Thanks: 45 Thanked 0 Times in 0 Posts	EP showing on dash EP is showing on the dash, does this mean it could be anything, T4 time?

15th March 2016, 13:26	#15
Davy Avid contributor suzuki vitara Join Date: Jun 2008 Location: Glasgow Posts: 228 Thanks: 498 Thanked 47 Times in 42 Posts	could be similar to this http://www.the75andztclub.co.uk/foru...d.php?t=119222 Check the first and last posts but then again it may be another problem. I think one of the t4 experts is required here Davy __________________ I am not a number i am a free man.

22nd March 2016, 18:57	#18
British icons Regular poster Rover 75 Touring Join Date: Dec 2015 Location: Norwich Posts: 40 Thanks: 45 Thanked 0 Times in 0 Posts	75 Not starting still Thanks again guys, just back home after a few days away. I will check these tomorrow

16th March 2016, 00:25	#17
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Peter, if the wiring checks out as per my how too I linked to, then it looks increasingly like an ECM fault. EP in the display is a result of the ECM not communicating on the CANBUS with the Jatco autobox ECU. This is how it works, once initialised the ECM outputs a low signal from pin 10 of connector 331, via a black/purple wire to one side of the fuel pump relay pull in coil, thus energising the relay contacts. The fuel pumps will now run. However for some reason your ECM isn't initialising, so you need to check to see if you have continuity from pin 9 of connector 371 to the pull in coil of the main relay in the engine compartment fusebox (Terminal 85 black/pink wire), and also the presence of 12 volts at pin 1 of CO371 (yellow/red). Also check fuses one and two in the engine compartment fusebox (the top two of the blade fuses) Brian

23rd March 2016, 07:14	#19
binraider Regular poster 2002 Rover 75 CDT Saloon Join Date: Sep 2010 Location: Diss, Norfolk Posts: 66 Thanks: 76 Thanked 6 Times in 4 Posts	Hi there - you checked the plugs that go into the fusebox: Under the Bonnet fuse box removed and although the wires are covered in dirt the plugs are spotless. On my CDT the problem was not the plugs going in but was that two very thin wires had broken inside the plastic sheathing but they were still in "one piece" so to speak - only by looking very closely could you see that there was something not right about them - they both had a "bendy bit" in them. Most of the wires are much thicker so probably are not susceptible to the problem Last edited by binraider; 23rd March 2016 at 07:17..

12th April 2016, 18:13	#20
British icons Regular poster Rover 75 Touring Join Date: Dec 2015 Location: Norwich Posts: 40 Thanks: 45 Thanked 0 Times in 0 Posts	75 Not starting still First of all, thank you to everyone for your help, pin 9 to main relay was a corroded wire inside the sleeve, looked like a pin size hole through the insulation tape and sleeve, wire was corroded approx 5mm inside. Fuel pump running EP off on dash Fuel at filter and common rail Still wont start, ...........

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode