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Fiat Scudo diesel pressure regulator wiring voltages

Posted By cowgillforge Wednesday, June 12, 2019 12:14:59 PM
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cowgillforge
 Posted Wednesday, June 12, 2019 12:14:59 PM
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Long time lurker without posting but some great advice found so many thanks.

I have a 2006 Fiat Scudo 2.0JTD van which was running fine. One day it just wouldn't start. No life from the double relay, no life at the diagnostics socket. Turned over but no attempt to fire.
After searching for similar problems on here I found this thread
http://www.bba-reman.com/forums/Topic101144.aspx?PageIndex=3
After much searching of the wiring harness I found a chaffed wire. Mended this and the van started right up. Diagnostics working again too and clear of codes. Big smile from me. Put it all back together carefully and wouldn't start, though with diagnostics this time. Pulled all apart again and looked for another broken wire but cannot find anything.

My code reader is giving P1138 Diesel pressure regulator S.C. to ground / O.C.
I have battery voltage on one terminal and 3.5v on the other.
Could anyone tell me if these sound correct?
SB126
 Posted Wednesday, June 12, 2019 4:20:36 PM
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I have battery voltage on one terminal and 3.5v on the other.


was that plugged in, or unplugged,

What is the fuel pressure, desired and actual,
cowgillforge
 Posted Friday, June 14, 2019 1:33:23 PM
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That was unplugged, ignition on.

I'll see what I get pluged in
K And R
 Posted Saturday, June 15, 2019 2:50:28 AM
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"What is the fuel pressure, desired and actual,"


Kev.

"If you dont KNOW how it works, don,t try to test or fix it"
cowgillforge
 Posted Sunday, June 16, 2019 11:04:04 AM
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Not able to get a reading for fuel pressure. (my scanner works fine on my golf so not the machine's fault).


Unfortunately I'm atleast 20miles from a decent garage with good diagnostics so stuck with trying to fix this from home - the joys of rural life
johnjo
 Posted Sunday, June 16, 2019 12:10:42 PM
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the only reading you should have at the fuel pressure regulator two terminal plug is 12v's at either side of this plug this 12v fed goes to the ecu pin no ??? switched earth. I would imagine this could be a ecu fault Wiring fault insulation fault in plug. Regards johnjo


Regards,

Fred

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cowgillforge
 Posted Sunday, June 16, 2019 12:20:16 PM
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johnjo (6/16/2019)
the only reading you should have at the fuel pressure regulator two terminal plug is 12v's at either side of this plug this 12v fed goes to the ecu pin no ??? switched earth. I would imagine this could be a ecu fault Wiring fault insulation fault in plug. Regards johnjo



Thankyou. That gives me something to go on. It would tie in with the fault code saying open circuit. I'll report back after investigating.
cowgillforge Marked As Answer
 Posted Sunday, June 16, 2019 1:25:10 PM
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FIXED***


Many many thanks.


It was the socket end of the wire going into the ecu multiplug - some corrosion. Cleaned and reconnected all fired up first turn of the key.


Now to put all the wiring back safely.
Thema
 Posted Sunday, June 16, 2019 1:34:05 PM
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Pleased for you!
Just out of curiousity though, as the job's done, what scan tool were you using?

Peter
cowgillforge
 Posted Sunday, June 16, 2019 1:43:39 PM
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It was a fairly basic Autel md 629. Electrics aren't really my thing though I have worked with Merc diagnostics for a spell a couple of years ago but that was on unimogs.

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