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Les40

Member Since: 15 Feb 2016
Location: Coventry
Posts: 36

2008 Range Rover Supercharged 4.2 SC V8 Stornoway Grey

Supercharged reduced performance

Hi having a mare.have used the search function but to no avail..have read there is a fuse in the rear fuse box relating to either the fuel pump or super charger. Can any one shed any light on this cheers les

30th Apr 2017 5:10pm

V8Noise

Member Since: 25 Apr 2015
Location: Dereham
Posts: 424

2017 Range Rover Autobiography 5.0 SC V8 Carpathian Grey

Fuse 7 15 amp is the fuse in the rear that looks after the auxiliary coolant pump. Mine keeps blowing and I've been trying to find out what else is on that circuit.

My rear fuse box is completely different to the handbook????? 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner

30th Apr 2017 6:44pm

axle

Member Since: 28 Oct 2007
Location: Perth Perth the end of the Earth
Posts: 2964

2008 Range Rover Supercharged 4.2 SC V8 Rimini Red

Nine times out of ten the auxiliary coolant pump has gone pop , why are you both looking at the fuse first? 2008 MY Supercharged
Rimini Red / Jet
four zone climate
remote park heater
and no ugly kid windows.
magnus satis quod turpis satis

1st May 2017 10:19am

pld118

Member Since: 25 Mar 2013
Location: Bairns
Posts: 4218

2014 Range Rover Vogue SDV6 Santorini Black

Re: Supercharged reduced performance

Les40 wrote:
Hi having a mare... relating to either the fuel pump or super charger. Can any one shed any light on this cheers les

Our 2007 SC suffered a loss of power on the motorway and the reduced engine performance warning light came on. This was diagnosed as being due to a defective water pump which serves the supercharger. The water pump was replaced an the problem was resolved.

1st May 2017 10:28am

V8Noise

Member Since: 25 Apr 2015
Location: Dereham
Posts: 424

axle wrote:
Nine times out of ten the auxiliary coolant pump has gone pop , why are you both looking at the fuse first?

I'm not and the OP was asking about the fuse, so I told him.

My pump was changed last October and, due to the fact I was still getting reduced engine performance, the wiring was looked at again in January. I still got reduced engine performance warning so did some research and found that a fuse, in the rear, can cause problems. A little more research and I found that fuse 7, protects the pump and mine was blowing every time the ignition was turned on. The research is not helped by the fact that the fuse box diagram in the handbook, is different to the actual car; significantly.

That's as far as I've got so far and I'm trying to identify if there's any other electrics being protected by fuse 7. I need to eliminate everything else to identify if the pump is no good. 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner

2nd May 2017 1:52am

zarnd

Member Since: 22 May 2014
Location: Kent
Posts: 459

2005 Range Rover Vogue SE 4.2 SC V8 Bonatti Grey

I had a pump failure on mine that gave me that warning.

Always easy to check a fuse first just in case... Alex

2018 Skoda Kodiaq vRS
2009 Caterham Supersport Race car
2007 M5 Touring
2005 Range Rover Vogue SE Supercharged
2004 SL55 AMG

2nd May 2017 7:54am

Skylinejgtc

Member Since: 19 Apr 2019
Location: Bradford
Posts: 2

2005 Range Rover Supercharged 4.2 SC V8 Buckingham Blue

Sorry to bump this thread but did you find a resolution to your issue, i am having problems with my Aux coolant pump as it doesnt seem to be getting a 12v with ignition on or when started?

18th Aug 2019 2:17pm

V8Noise

Member Since: 25 Apr 2015
Location: Dereham
Posts: 424

My indy ran a new cable from fuse 7 to the pump and no longer does the fuse blow hence the pump works all the time, as it should so no more reduced engine performance. 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner

18th Aug 2019 3:05pm

Skylinejgtc

Member Since: 19 Apr 2019
Location: Bradford
Posts: 2

Thanks a lot, thats basically what i needed to know, is that fuse 7 in the boot fuses?
Will do that when i get a chance.

18th Aug 2019 3:10pm

V8Noise

Member Since: 25 Apr 2015
Location: Dereham
Posts: 424

Yes, it is and everytime I started the engine it blew. The new cable was added which sorted the problem. 2017 5.0 Autobiography Supercharged
2005 Merc SL350
2005 Disco HSE 2.7 oil burner

18th Aug 2019 3:16pm

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