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Pinky



Member Since: 09 Jun 2016
Location: England
Posts: 208

England 2011 Defender 110 Puma 2.4 DCPU Baltic Blue
ABS fault code
Hi all, the ABS TC and brake warning lights have just come on. The fault code thrown up is C1B02-16 “ return pump circuit “.
Anyone any idea where to start looking for a problem?

2011 2.4 puma.
Post #784985 5th Aug 2019 11:59am
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1076

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
Found this in a Range Rover manual (?) "Return pump circuit voltage
below threshold" -> "Refer to the electrical circuit diagrams and check the ABS module for battery voltage at the fused supply circuit"



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Post #785201 6th Aug 2019 12:08pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Wabco ABS only


Click image to enlarge


1. Make shore fuse link is ok

2 make shore earth ok driver seat box your ABS ECU unit is in here too

3 make shore return pump relay works

4 arrow shows feed back circuit for abs unit i.e. has relay closed and or is power supply + for return pump ABS ok


Last edited by dorsetsmith on 6th Aug 2019 4:31pm. Edited 5 times in total
Post #785209 6th Aug 2019 12:55pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Wabco or Bosch ABS?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #785210 6th Aug 2019 1:03pm
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Pinky



Member Since: 09 Jun 2016
Location: England
Posts: 208

England 2011 Defender 110 Puma 2.4 DCPU Baltic Blue

Click image to enlarge

How do you tell the difference?nthere is nothing on it except Land Rover!


Last edited by Pinky on 6th Aug 2019 1:16pm. Edited 1 time in total
Post #785215 6th Aug 2019 1:14pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Post a photo Smile

Or you will have a ABS ECU under the seat if it’s Wabco.  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #785216 6th Aug 2019 1:15pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6605

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Bosch ABS system, so the above wiring diagrams don’t apply.  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #785217 6th Aug 2019 1:22pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Bosch ABS wiring



Click image to enlarge


Last edited by dorsetsmith on 6th Aug 2019 6:15pm. Edited 3 times in total
Post #785221 6th Aug 2019 1:55pm
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1076

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
um, sorry
Post #785227 6th Aug 2019 2:41pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Bosch ABS has built in ECU check loom plug to start with
Post #785269 6th Aug 2019 6:50pm
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Pinky



Member Since: 09 Jun 2016
Location: England
Posts: 208

England 2011 Defender 110 Puma 2.4 DCPU Baltic Blue
dorsetsmith wrote:
Bosch ABS wiring



Click image to enlarge

Thanks for that, is there any chance of a higher res image? I can’t read it when zoomed to a readable size! Sorry, I’m an old git with poor peepers!
Post #785280 6th Aug 2019 7:43pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

Post #785298 6th Aug 2019 8:06pm
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Pinky



Member Since: 09 Jun 2016
Location: England
Posts: 208

England 2011 Defender 110 Puma 2.4 DCPU Baltic Blue
Thanks for all your help but my woes have become much worse!
Today whilst at a customers we had a sudden downpour, we stood undercover next to the Land Rover when suddenly the horn sounded as if I had tried to arm the alarm with a door open. It started and drove as normal but when I reached my yard I switched off, removed the keys and was just about to get out when there was a clicking noise from somewhere in the middle of the dash and all the dashboard lights started flashing! Then , my dashcam which is normally only on with the ignition switched on and off twice! Then, the indicators started flashing. This series of events went on for some time and I was worried about leaving my dog in it , fearing it may just burst into flames!
I think I have a serious problem that I may not be able to afford to fix, I cannot afford for anyone to replace a multitude of expensive parts only to find “ that wasn’t it”! I certainly won’t be taking it to a main dealer and I’m not sure my Indy will find the problems but I will get them to investigate. Keep your eyes peeled, someone may get a very cheap extremely cherished 110 Big Cry
Post #785314 6th Aug 2019 8:35pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1624

Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
I’d look at the aftermarket wiring that’s been done Whistle most of the oddball wiring faults I fix are aftermarket junk related Whistle

The clicking is probably a faulty relay. The black ford relays aren’t the most reliable in my opinion. The wiring in these is very simple compared to modern cars. Any auto electrician worth his salt should be able to fix it.


Help him though write down what happens, what else is related, what the weather is like, what sort of journey you’d done etc- will help diagnose Thumbs Up
Post #785635 7th Aug 2019 11:29pm
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macfrank



Member Since: 05 Nov 2015
Location: somewhere in the north
Posts: 1076

Germany 2015 Defender 110 Puma 2.2 SW Keswick Green
Pinky wrote:
I think I have a serious problem


Despair Not! Wink I'm with NickMc. An auto electrician should be able to fix it.
Why? In my experience, electric/electronic problems that seem "catastrophic" to the user often have a very simple cause. In your case everything seems to go mad, but that might be caused by e.g. just an intermittend short cut (water??) or, as said, a faulty relay. One tiny fault may then trigger other systems that don't like being triggered that way (such as the alarm).
When looking for faults, it is important to focus on / find the main cause in a systematic manner (or just by knowing which parts usually fail) without being guided by emotionally stressful symptoms, such as all the lights going bonkers Smile





Or to cut it short

Post #785840 9th Aug 2019 11:08am
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