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lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2749

TD5 ECU question, never had a solution

In 2006 we bought a new TD5 90 CSW. In the 8 years we had it, it always had a minor anomily which l never got to the bottom of.
The Landy would drive fine but if you applied full throttle it would default into the low range map, where the pedal had to be pressed much further and engine response was more progressive.
It would then stay in that mode until you turned off the ignition.
My current Defender a 2005 110 CSW does the same thing, l've had it for 3 years and 30,000 miles.
lt's been remapped and had a new MAF plus everything else and it's still the same.
l can avoid it by not flooring the accelerator, which is not needed anyway after the remap, but l'd love to solve the problem if l could.

11th Jun 2017 5:45pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

It could be a few things. Maybe it has a strong map on it and is tripping the MAP sensor. When it sees overboost it goes into limp mode but doesn't necessarily put the MIL on the dash.

Best thing to do would be to either plug it into a nanocom and take it for a drive to see if it is reading over 15psi of boost. Failing that you could try unplugging the MAP sensor and see if it will do the same thing.

The cause could also be a sticking turbo wastegate actuator. This can be checked by clamping the rod with mole grips and checking for free up and down movement. 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

11th Jun 2017 6:07pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2749

But our 2006 TD5 did it from new and was never remapped.
The 2005 TD5 has done it before it was remapped and is the same after the remap.
In the low range map it still performs the same but requires the accelerator to be pressed further down which makes it a pain if it happens on the motorway, and also a bit annoying in traffic.
The missus drives a non-remapped 2003 TD5 CSW and that one's fine....doesn't default into a different map when pushed.

11th Jun 2017 7:49pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

Have you tried unplugging the high/low switch on the transfer box?

Does a nanocom show it as a range change on the switch input menu? 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

11th Jun 2017 8:49pm

Macpaul

Member Since: 25 Mar 2013
Location: SW Surrey
Posts: 439

2013 Defender 110 Puma 2.2 USW Loire Blue

That's fascinating.

I had a 2003 TD5 that had those symptoms, (de-rating till key-off, key-on) but learned Land Rover experts (real experts not dealers) were never able to resolve the problem. It doesn't sound as marked a de-rate as yours though.

I ran a dedicated earth to the ÉCU, changed the ÉCU, changed the throttle position sensor, had a remap, changed the MAP, MAF, checked the fuel pressure, made sure the fuel tank was vented, changed the turbo hoses, changed the turbo, checked the high-low switch, ran a Nanocom live data check on all perameters etc, etc.

Some of these measures improved the running, but didn't actually solve the problem.

Maddening. 2003 Td5 110 Hardtop
Now a 2013 110 USW too.

11th Jun 2017 9:52pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2749

Sounds like the same thing tbh.

May be just part of the software. It's not that bad, the missus has never even mentioned it.
l wonder if it's to protect the drive line from excessive stress.

I tested it on a hill and the actual performance is the same, possibly a fraction slower, just needs larger throttle pedal inputs and the turbo comes on boost less suddenly.

I even wrote to one of the LR magazines at the time, they printed the letter in their tech answers section and suggested that "the pre 2005 ECU had some issues with H/L range map shifting" or something to that effect.

12th Jun 2017 9:12am

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