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alexatnd



Member Since: 19 May 2015
Location: Yorkshire
Posts: 241

United Kingdom 
CPS woes
Hi,
Seem to be having Crank position sensor woes

TD5 was having difficulty starting so had a loook at the existing CPS. The "pin" in the middle was worn flat to the outer plasitc casing which was also worn so replaced with new sensor ... turned key and started 1st time, switched it off and on again, started 1st time. Moved landy to another parking spot,ran for 45 mins, switched off and tried to start ... not a peep ....
took sensor out and had a look and the "pin" in the end was definitely smaller... looked on lrworkshop and there's supposed to be washer between sensor and bellhousing wasn't one present checked round and nothing had falledn off ....bought sensor no 3 and the washer and fitted them, although TBF it was thinner than i expected....
... and because of all the cable movement, one of the wired in the plug broke Sad Soldered a new plug onto end of cable adding about 3 " to length of harness ( heat shrink round each solder joint then some tape then bigger heat shrink then some conduit). Turned key, 4 short turns of the stater motor.... started ... runs really well... ran for 45 mins, up to normal running temp, switched off tried again ... nope wont start.

Got a Lynx evo had a look for fault codes , none applicable ( only ones for kit thats not present on car along with a cam bus error).

So know that you can get interference from starter motor and it might be that, do have a new starter motor to

Anyone else hd these issues? Just wondering if a thicker washer on the CPS might be in order. Think the sensors are OEM.

Anyone else seen these issues ? She runs really well ... if onlt she would start.

Other things done

new injector seals
fuel pessure regulator ( and checked that 4 bar perssure out of it)
new fuel filter housing and associatred valve( old one fell appart)
new fuel pump
no visible fuel leaks at filter or fpr




A Santa - 1977 Series 3 - new chassis, tub, brakes
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road
Effie - 2004 110 TD5 County
Post #980439 30th Jan 2023 8:49am
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Hazza



Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 208

United Kingdom 1990 Defender 110 Td5 HT Bronze Green
You can rule out the starter motor interference by tow/bump starting it. 1990 Defender 110 200TDI Camper - now converted to Td5 power
Post #980440 30th Jan 2023 9:12am
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 556

Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
Once I have repaired engine ECU with broken resistor in CPS signal circuit - it was working, but was extremly sensitive to "the right" voltage from CPS. After repair, it was working with nearly anything.
So just to be sure - try another engine ECU. "Drobek" = The Small One - Discovery 2, "BlufĂ­nek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #980441 30th Jan 2023 9:17am
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alexatnd



Member Since: 19 May 2015
Location: Yorkshire
Posts: 241

United Kingdom 
Hazza wrote:
You can rule out the starter motor interference by tow/bump starting it.


Smile sadly because of where its parked i have to start it to get somewhere where i can tow start it Smile
A Santa - 1977 Series 3 - new chassis, tub, brakes
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road
Effie - 2004 110 TD5 County
Post #980442 30th Jan 2023 9:28am
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alexatnd



Member Since: 19 May 2015
Location: Yorkshire
Posts: 241

United Kingdom 
MadTom wrote:
Once I have repaired engine ECU with broken resistor in CPS signal circuit - it was working, but was extremly sensitive to "the right" voltage from CPS. After repair, it was working with nearly anything.
So just to be sure - try another engine ECU.


Not sure if im at that point in the testing .. but I'll keep it in mind Smile
A Santa - 1977 Series 3 - new chassis, tub, brakes
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road
Effie - 2004 110 TD5 County
Post #980443 30th Jan 2023 9:30am
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alexatnd



Member Since: 19 May 2015
Location: Yorkshire
Posts: 241

United Kingdom 
And problem fixed ..!

Thre good news is that along the way I've fixed a whole batch of things and done some preventating maintenance

in the end the bad starting problems were down to noise from the starter motor. Replaced that and starts on 1st turn of key ... more than once ... yay!! Santa - 1977 Series 3 - new chassis, tub, brakes
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road
Effie - 2004 110 TD5 County
Post #980775 1st Feb 2023 9:31am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 768

France 2002 Defender 110 Td5 DCPU Chawton White
Good. I was going to say, when you mentioned 'nothing', the CPS does not control the starter, it controls the firing (diesel). All resolved and you have some spare sensors for your collection.
Post #980791 1st Feb 2023 10:43am
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alexatnd



Member Since: 19 May 2015
Location: Yorkshire
Posts: 241

United Kingdom 
Yeah!
probably a few more than id like to have ... but certainly happy bunny
A Santa - 1977 Series 3 - new chassis, tub, brakes
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road
Effie - 2004 110 TD5 County
Post #980803 1st Feb 2023 11:49am
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