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alexatnd

Member Since: 19 May 2015
Location: Yorkshire
Posts: 270

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

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, disc brakes,SU Carb
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost
Effie - 2004 110 TD5 County

30th Jan 2023 8:49am

Hazza

Member Since: 10 Jan 2011
Location: North Yorkshire / Leeds
Posts: 214

You can rule out the starter motor interference by tow/bump starting it. 1990 Defender 110 200TDI Camper - now converted to Td5 power

30th Jan 2023 9:12am

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 622

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, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

30th Jan 2023 9:17am

alexatnd

Member Since: 19 May 2015
Location: Yorkshire
Posts: 270

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

sadly because of where its parked i have to start it to get somewhere where i can tow start it

A Santa - 1977 Series 3 - new chassis, tub, disc brakes,SU Carb
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost
Effie - 2004 110 TD5 County

30th Jan 2023 9:28am

alexatnd

Member Since: 19 May 2015
Location: Yorkshire
Posts: 270

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

A Santa - 1977 Series 3 - new chassis, tub, disc brakes,SU Carb
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost
Effie - 2004 110 TD5 County

30th Jan 2023 9:30am

alexatnd

Member Since: 19 May 2015
Location: Yorkshire
Posts: 270

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, disc brakes,SU Carb
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost
Effie - 2004 110 TD5 County

1st Feb 2023 9:31am

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1051

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.

1st Feb 2023 10:43am

alexatnd

Member Since: 19 May 2015
Location: Yorkshire
Posts: 270

Yeah!
probably a few more than id like to have ... but certainly happy bunny
A Santa - 1977 Series 3 - new chassis, tub, disc brakes,SU Carb
Gertie - 1999 110 TD5 - like a Phoenix from the ashes back on road... almost
Effie - 2004 110 TD5 County

1st Feb 2023 11:49am

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