Location of DAC1861 Diode Pack

[actu_8]

Hello - can anybody tell me where the DAC1861 Diode Pack is located on a 1990 4.2 Range Rover.

Thanks

[ChrisJC]

Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!

Chris.

[paul c]

Not 100% sure if it is but could it be under the drivers seat with the EFI relays?

[actu_8]

Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!

Chris.

Hi - many thanks - it's a safety mechanism to ensure fuel is only delivered when the engine is running. Pauls reply indicates that it's under seat is consistent with other info I have but the chap whom I'm helping doesn't think there's a socket there for it

[actu_8]

Not 100% sure if it is but could it be under the drivers seat with the EFI relays?

Thanks. As per my other reply, I'm not certain. I'm assuming drivers seat as in Right side/UK?

[actu_8]

Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!

Chris.

Hi - many thanks - it's a safety mechanism to ensure fuel is only delivered when the engine is running. Pauls reply indicates that it's under seat is consistent with other info I have but the chap whom I'm helping doesn't think there's a socket there for it

Not under the seat according to an American workshop manual, but then again it doesn't mention the component at all1

[ChrisJC]

I can't tell unfortunately. My copy of RAVE is 1995, and there is no mention of a diode pack in the fuel pump / inertia switch circuit.

Chris.

[stevieturbo]

Why does Rimmer list it as "steering module" diode pack ?

https://rimmerbros.com/Item--i-DAC1861

Jagbits something else

https://www.jagbits.com/product/DAC1861-OE.html

[paul c]

Not 100% sure if it is but could it be under the drivers seat with the EFI relays?

Thanks. As per my other reply, I'm not certain. I'm assuming drivers seat as in Right side/UK?

Yes, if it's like any of the RHD rangerovers I have had.

[paul c]

My Haynes manual is at home but I won't be home until Easter if it does have anything

[paul c]

Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!

Chris.

Hi - many thanks - it's a safety mechanism to ensure fuel is only delivered when the engine is running. Pauls reply indicates that it's under seat is consistent with other info I have but the chap whom I'm helping doesn't think there's a socket there for it

I am not sure what you mean about there not being a socket there for it, as in there is no diode pack currently in the vehicle and he wants to add one or it doesn't look like there is one the same amongst all the other relays?
I never stripped out my 1990 so having trouble remembering, but I am sure there were quite a few relays under the seat in that one, the 1988 only had 3 from memory. It may not be a red casing if it has been replaced before.

[actu_8]

Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!

Chris.

Hi - many thanks - it's a safety mechanism to ensure fuel is only delivered when the engine is running. Pauls reply indicates that it's under seat is consistent with other info I have but the chap whom I'm helping doesn't think there's a socket there for it

I am not sure what you mean about there not being a socket there for it, as in there is no diode pack currently in the vehicle and he wants to add one or it doesn't look like there is one the same amongst all the other relays?
I never stripped out my 1990 so having trouble remembering, but I am sure there were quite a few relays under the seat in that one, the 1988 only had 3 from memory. It may not be a red casing if it has been replaced before.

Hi Paul. Googling the fault indicated that it could be that this diode pack has failed. So I infer it's present on the vehicle....somewhere!! The 'no socket' comment is that the info indicating it sits somewhere close to the Fuel Pump relay is inaccurate.

Why does Rimmer list it as "steering module" diode pack ?

https://rimmerbros.com/Item--i-DAC1861

Jagbits something else

https://www.jagbits.com/product/DAC1861-OE.html

Yes Steve - It's listed as that but the rimmer bros page does state multiple applications and shows 'Rover V8 EFi Electronic Components' as one of the applications for the part.

If you click on the EFI link, it shows a picture of the EFI parts including the DAC1861 (Number 72)

Interestingly, it states 'non-catalyst' which could explain why it's not mentioned in the USA version of the workshop manual. Or did the UK 90's model have cats? I'll ask the owner.

My Haynes manual is at home but I won't be home until Easter if it does have anything

Thanks Paul. It might just have the answer!!

[ChrisJC]

The 'flapper' type EFI system had a diode pack, but that was never fitted to the 4.2 litre engine as far as I know.

It sits next to the main relay and fuel pump relays next to the ECU, which I think is under the drivers seat.

Chris.

[actu_8]

The 'flapper' type EFI system had a diode pack, but that was never fitted to the 4.2 litre engine as far as I know.

It sits next to the main relay and fuel pump relays next to the ECU, which I think is under the drivers seat.

Chris.

Many thanks Chris.

[SuperV8]

DAC1861 diode pack/steering module was only fitted flapper 4CU EFI. Located next to the main relay and fuel pump relay.
From Rimmer
"Specifications and additional product information Range Rover Classic 70-95 - 3.5L Efi 1995 on"

4.2 is hotwire 14CUX and does not have this diode pack.