Td5 won't fire

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Alarmgard

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Re: Td5 won't fire
« Reply #30 on: January 23, 2014, 09:10:49 PM »
New starter went on last night. Still no joy  :'(
However I did notice what may be a diesel leak from regulator. Not evident when looking from top of engine but once removed the starter the pipes above were damp. Maybe explains why I thought there was an oil leak on the sump.

If the leak from the FPR is bad enough this will be why its not starting, if your not in a hurry you can get a simple repair kit off ebay (Viton O Rings) generally the regulator is ok, just an o ring gone. Theres plenty of info on the net on how to do the repair.

Colin Rodger

Marshals needed for CompSafari's give me a call if you can help.
Email:colin.rodger@virgin.net or mobile: 07767726075

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ruaritreble

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    • ruariboy
Re: Td5 won't fire
« Reply #31 on: January 26, 2014, 08:29:05 PM »
Regulator changed.
Wouldn't start so tried a long tow start, during this nanocom showed rpm to be zero, me thinks this is why it won't fire.  Either new crank sensor or the ecu (tested OK) is faulty.
I tried to measure the voltage across the cranksensor wires at the ecu end. I was expecting 2-3V ac.  Does any know the resiatance of the crank sensor?
Karis 110 - The perfect way to get a MTB to the top of the hill.
Power to the pedal!

Myrtle Air Portable - V8
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mikes lr

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  • Name: michael sherwood
Re: Td5 won't fire
« Reply #32 on: January 26, 2014, 10:41:49 PM »
found this /it may well crank over fast enough,but spikes from the starter can get sent back up the battery lead and corrupt the crank sensor signal,so the ecu cant work out when to inject.
or this
The ECM measures the outputs from the CKP. The ECM measures the positive signal from the CKP at pin 13 of ECM
connector C0158. The ECM measures the negative signal from the CKP at pin 36 of ECM connector C0158. The earth
path is via pin 16 of ECM connector C0158.
Voltage generation from the CKP sensor is relative to engine speed. The values expected from a good CKP sensor
are as follows:
l 2 to 3 volts with engine cranking.
l Rising to 6 to 6.5 volts from 1000 rev/min upwards.
The above readings are dependent upon correct air gap between the tip of the CKP sensor and the passing teeth of
the reluctor ring. hope it helps

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ruaritreble

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    • ruariboy
Re: Td5 won't fire
« Reply #33 on: January 27, 2014, 11:10:22 AM »
Hi Mike
As it wouldn't start on a tow and the starter is replaced, I can rule out starter motor corrupting the signals to the crank sensor.
I tried to measure the voltage across the CKP during the tow - negligible readings. Note they are in AC volts. I have since been told you need to do this with an oscilloscope. I get to borrow that on Wednesday.
Alive Tuning couldn't tell me when do ECU diagnostics if the CKP ports were measured.
CKP has been replaced. I will need to check continuity of the wires to it.
Karis 110 - The perfect way to get a MTB to the top of the hill.
Power to the pedal!

Myrtle Air Portable - V8
------------------------
MM6IIO
------------------------
http://www.youtube.com/user/ruariboy

http://s826.photobucket.com/home/ruariboy

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genem

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  • I'm not completely daft. Some pieces are missing.
  • Name: Gene Maxwell
Re: Td5 won't fire
« Reply #34 on: January 28, 2014, 02:29:41 PM »
I am SO glad I have a 300 Tdi.

:-)

If its not broken you are not trying hard enough....

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rangerovering

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Re: Td5 won't fire
« Reply #35 on: January 28, 2014, 03:13:23 PM »
At the cost and expense of all these parts you've been replacing I suggest you get it plugged into Testbook and see if that throws anything up.
Steve




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MudBucket

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Re: Td5 won't fire
« Reply #36 on: January 30, 2014, 10:43:49 AM »
I had a similar thing with my td5.
turns out it was the wires about 8~12 inches from the plug for the crank position sensor, just under the inlet manifold. The wires had worn through the shielding and were shorting/separating etc.
the wires were inside the cable sleeving so was not obvious to look at.

resoldered the wires and insulated them. no problem since.

i would check the continuity as you suggested.

cheers


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ruaritreble

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    • ruariboy
Re: Td5 won't fire
« Reply #37 on: February 03, 2014, 09:20:48 PM »
Did a few continuity tests of the loom to the cranksensor and of the sensor. These came up all ok indicating ecu. Took the lid off the ecu to find signs of water ingress. Replacment ecu fitted coded to the injectors and set to learn the 10AS security. All back together and on the road.

Thanks for the help
Karis 110 - The perfect way to get a MTB to the top of the hill.
Power to the pedal!

Myrtle Air Portable - V8
------------------------
MM6IIO
------------------------
http://www.youtube.com/user/ruariboy

http://s826.photobucket.com/home/ruariboy

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diesel jock

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Re: Td5 won't fire
« Reply #38 on: February 03, 2014, 09:49:08 PM »
nice one ruari b@#&ard ecu after all at least
 its up and running

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Greigboy

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Re: Td5 won't fire
« Reply #39 on: February 04, 2014, 07:29:42 AM »
Nice one, there's nothing worse than chasing a fault and getting nowhere, who tested the ECU and said that it was fine????
1986 Land Rover 90 CSW V8

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ruaritreble

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Re: Td5 won't fire
« Reply #40 on: February 04, 2014, 08:54:25 AM »
Alive Tuning tested the ECU. To give them the benefit of doubt, they did say it was most unlikely the ecu to be at fault. All the tests they do came back ok. Next stage would be to stick it in their car and program in the security & injectors and test run it.
I have spoke to them since suggesting in future they check crank sensor ports.
Karis 110 - The perfect way to get a MTB to the top of the hill.
Power to the pedal!

Myrtle Air Portable - V8
------------------------
MM6IIO
------------------------
http://www.youtube.com/user/ruariboy

http://s826.photobucket.com/home/ruariboy

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rangerovering

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Re: Td5 won't fire
« Reply #41 on: February 04, 2014, 12:04:46 PM »
Alive Tuning tested the ECU. To give them the benefit of doubt, they did say it was most unlikely the ecu to be at fault. All the tests they do came back ok. Next stage would be to stick it in their car and program in the security & injectors and test run it.
I have spoke to them since suggesting in future they check crank sensor ports.

And this is the same company who did not advise changing a set of injectors that were tested and known to be flowing less than 60% but insisted from proceding with a remap. Last I heard they do not have T4 and do not do comprehensive health checks on vehicles before mapping. From personal experience and having worked on several of their tuned cars I wouldn't go near them with a bargepole.
« Last Edit: February 04, 2014, 06:45:41 PM by Pilot Custard »
Steve




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cpm-blue-90

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Re: Td5 won't fire
« Reply #42 on: February 23, 2014, 10:33:57 AM »
Another one that can cause this is injector seals, very cheap to replace, sorry if this has been mentioned.