My car is a wiring nightmare!!!!

M88JCP · Nov 9th, 2020, 11:40

Morning all

Its me again, I'm sorry for asking yet another wiring question!!

I previously identified that I had an unplugged wiring connector hanging down the front of my engine block. I got some great advice from Fenton (T5R92011) who identified that it was the PCV cable so this has now been rectified. Thankyou Fenton

Why you'd unplug it who knows as the famous 'glove test' shows my PCV is working fine!!!

My new problem is the oil pressure sender unit, its not plugged in and for the life of me, I cant find the wire!!! I have been on top of, and underneath the car and it just vanished!!! When I first turn on the ignition the oil light comes on and then goes off, even before the engine is started, and the same with the amber engine light.

I don't think is normal, but can anybody provide their thoughts or advice on this please? Also, if the wire is missing (as I suspect), does anybody know where I can try and trace the wire back too in the wiring loom?

Thanks all for your time and support as always

Welton · Nov 9th, 2020, 13:29

According to my book of wiring diagrams; the oil pressure switch for the 5-Cyl Turbo engines has a single wire coloured BK-BN (black and green) which seems to be wired straight to the ECU - doesn't look like it comes from a harness as such.

OPS is at the front of the engine screwed into the block, my knowledge is limited but that's as far as I could understand it from the above book.

M88JCP · Nov 9th, 2020, 16:00

Thanks Welton, that's helpful. I did find a single black and green wire but it was routed to the A/C compressor!!

You'd think it would be easy to find a singular wire with that 'particular end

Nov 9th, 2020, 11:40	#1
M88JCP Member Last Online: Mar 27th, 2024 18:55 Join Date: Feb 2018 Location: Birmingham	My car is a wiring nightmare!!!! Morning all Its me again, I'm sorry for asking yet another wiring question!! I previously identified that I had an unplugged wiring connector hanging down the front of my engine block. I got some great advice from Fenton (T5R92011) who identified that it was the PCV cable so this has now been rectified. Thankyou Fenton Why you'd unplug it who knows as the famous 'glove test' shows my PCV is working fine!!! My new problem is the oil pressure sender unit, its not plugged in and for the life of me, I cant find the wire!!! I have been on top of, and underneath the car and it just vanished!!! When I first turn on the ignition the oil light comes on and then goes off, even before the engine is started, and the same with the amber engine light. I don't think is normal, but can anybody provide their thoughts or advice on this please? Also, if the wire is missing (as I suspect), does anybody know where I can try and trace the wire back too in the wiring loom? Thanks all for your time and support as always __________________ 2009 C30 T5 230 Geartronic R-Design SE Sport. Passion Red, Electric Black Leather Seats, Winter Pack, Sunroof, BLIS, Dynaudio, Bluetooth, Laminated Windows, Front and Rear PDC, MIDIR 18" Alloys

Nov 9th, 2020, 13:29	#2
Welton Premier Member Last Online: Sep 14th, 2021 17:03 Join Date: Feb 2009 Location: Market Harborough	According to my book of wiring diagrams; the oil pressure switch for the 5-Cyl Turbo engines has a single wire coloured BK-BN (black and green) which seems to be wired straight to the ECU - doesn't look like it comes from a harness as such. OPS is at the front of the engine screwed into the block, my knowledge is limited but that's as far as I could understand it from the above book. __________________ 2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale) 2010 Citroen C4 1.6 HDi (bizarre Gearbox model). 2010 Renault Twingo (refreshingly simple) 2018 Infiniti Q30 1.6T Business Executive (what's this button do?)

Nov 9th, 2020, 16:00	#3
M88JCP Member Last Online: Mar 27th, 2024 18:55 Join Date: Feb 2018 Location: Birmingham	Thanks Welton, that's helpful. I did find a single black and green wire but it was routed to the A/C compressor!! You'd think it would be easy to find a singular wire with that 'particular end __________________ 2009 C30 T5 230 Geartronic R-Design SE Sport. Passion Red, Electric Black Leather Seats, Winter Pack, Sunroof, BLIS, Dynaudio, Bluetooth, Laminated Windows, Front and Rear PDC, MIDIR 18" Alloys

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