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Benny

Member Since: 03 Nov 2016
Location: Plymoth
Posts: 15

TD5 1999-2002 Throttle Pedal not responsive ECU Amber light

Hi Folks.
1999 Defender ECU Amber light came up after about 4 hours standing in a field. Went through some puddles earlier. Started o.k. but no throttle response. Checked red ecu plug - no oil. Next day went to investigate - all o.k. Been o.k. for last 2 weeks of daily driving. However I know the issue is in the post...
So checked MAP / MAF and cleaned. Both looked good anyway. ECU Red plug - all o.k. Injector harness changed recently. Decided to bypass the pedal to ECU loom. Bought off ebay. Checked o.k. Connected up and issue returned. Checked drwgs and managed to find 1999 to 2002 and the wiring is different. Passes through a header - 0291. Must pick up some power there as the glowplugs light did not come on either when bypassed.
Has anyone managed to replace the section of cabling from pedal to ECU? Unable to locate Header 0291 at present as well. This I imagine is what I must find.
Thanks in advance for any info on this.

Click image to enlarge

21st Nov 2023 5:36pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5732

2006 Defender 110 Td5 USW Zermatt Silver

I’ve replaced the ecu to pedal a few times, and never had any issues just using trailer cable (so enough wires) and joined via cutting and soldering in place. So sorry never needed to find Header 0291

21st Nov 2023 6:30pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5732

On your picture it shows wires on the top left. These have a number of 160 on the end. The 160 is their length in mm’s.

B=black
1.5=gauge of wire
160=length.

So the header is only 160mm from ecu.

21st Nov 2023 6:48pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1089

2002 Defender 110 Td5 DCPU Chawton White

Cool did not know that! Thanks, now I just have to remember that next time I do wiring troubleshooting

21st Nov 2023 7:44pm

Screbble

Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2108

2004 Defender 90 Td5 XS CSW Zambezi Silver

landy andy wrote:
On your picture it shows wires on the top left. These have a number of 160 on the end. The 160 is their length in mm’s.

B=black
1.5=gauge of wire
160=length.

So the header is only 160mm from ecu.

I didn’t know that either - thanks for sharing

21st Nov 2023 8:02pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

You've not bypassed the pedal wiring correctly. The loss of glow warning shows you've mixed up the Black/Yellow for glow plug warning light with the one you meant to use for the pedal. Easily done as LR used the same colours for multiple things on the Td5 ECU loom, and the pinout numbering isn't intuitive (it zig-zags).

This is the face (not wires side) of the connector.

Click image to enlarge

Headers just join wires together. So for the pedal, the white/purple from the ECU is split into two to go to the pedal.

Looking at the full pedal wiring diagram for 1999-2001MY:

Click image to enlarge

You need these terminals:

Click image to enlarge

Remembering this is the non wire side.

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Nov 2023 8:55pm

Benny

Member Since: 03 Nov 2016
Location: Plymoth
Posts: 15

Hi Martin
Thanks for the reply. So to be sure, to be sure as it were. Which actual wire goes to which pin on the ECU?
Thanks in advance

21st Nov 2023 10:51pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

The wiring diagram snippet I posted gives you the 6 at the pedal end going to the 4 at the ECU end.

1988 90 Td5 NAS soft top

2015 D90 XS SW

21st Nov 2023 11:05pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5732

At ECU

WG. White and Green to pin 12 on ECU connector
WS. White and Slate grey to pin 36 on ECU connector
BY. Black and Yellow to pin 26 on ECU connector
WP. White and Purple to pin 14 on ECU connector

22nd Nov 2023 1:19am

Benny

Member Since: 03 Nov 2016
Location: Plymoth
Posts: 15

Landy Andy and Martin thanks for this. I'll have another go and get back with the outcome.

22nd Nov 2023 8:12am

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5732

No problem. That is what this place is for.

I’m learning too, I didn’t know about the wire length info, or the pin number info on the drawings till looking into this for you, so we are all learning. Apart from Martin as he’s the wiring god when it comes to this stuff.

From what Martin is writing it sounds like you have just picked the wrong Black Yellow. Possibly you’ve used 30 ???

Keep us up to date on how it’s going.

Last edited by landy andy on 22nd Nov 2023 9:01am. Edited 1 time in total

22nd Nov 2023 8:46am

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

landy andy wrote:
On your picture it shows wires on the top left. These have a number of 160 on the end. The 160 is their length in mm’s.

B=black
1.5=gauge of wire
160=length.

So the header is only 160mm from ecu.

Genius. I have always wondered what those numbers referred to

22nd Nov 2023 8:53am

Benny

Member Since: 03 Nov 2016
Location: Plymoth
Posts: 15

Hi Landy Andy. Spot on! I selected wrong black yellow connection. Many thanks to yourself and Martin.

Regarding the symptoms I had regarding amber management light and no throttle response, only tickover.
Is there anything else I could also check out?

22nd Nov 2023 12:31pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5732

The symptoms for failed ecu-pedal in my experience has always been.

Start engine, everything ok, no warning lights, touch pedal, no increase in revs, warning light on. Or drive through puddle, zero throttle response, warning light on, restart then as above. Starts ok, till you touch pedal.

You could check you crank sensor and it’s wiring, but think you are on correct track

22nd Nov 2023 3:59pm

Benny

Member Since: 03 Nov 2016
Location: Plymoth
Posts: 15

Thanks Andy. Hopefully all ok. Until next issue 🙂

22nd Nov 2023 5:28pm

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