Simon_CSK Posted May 26, 2018 Share Posted May 26, 2018 If I am changing the ECU on a TD5, specifically the Discovery 2, what other than the ECU and the key remote do I need to change over? Quote Link to comment Share on other sites More sharing options...
dirtyninety Posted May 26, 2018 Share Posted May 26, 2018 Nothing, just plug new ECU in, Sync ECU to the BCU and it will be fine. The ONLY thing you need to swap is the ECU. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 26, 2018 Author Share Posted May 26, 2018 Great thanks how do you sync the BCU? Quote Link to comment Share on other sites More sharing options...
Shackleton Posted May 27, 2018 Share Posted May 27, 2018 You'll need to give the ECU the codes from the injectors too. Never sync'd the ECU/BCU before but you're going to need a diagnostic tool for sure. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 27, 2018 Author Share Posted May 27, 2018 Changed my mind with this I think what I need to do is get the injectors tested. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted May 27, 2018 Share Posted May 27, 2018 whats the issues that your having @Simon_CSK? Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 27, 2018 Author Share Posted May 27, 2018 It started off with misfire and the throttle dropping off to tick over. But restarting cured it. It got progressively worst to the point is would only tick over.The AA were called and there was oil in the red ECU plug which he cleaned out with contact cleaner. That seemed to cure it and I got home 30 miles with only one splutter. The next day the car would only rev to 1800 RPM so I ordered and new loom for the injectors. After that was fitted it would only tick over and that is where we are today. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted May 28, 2018 Share Posted May 28, 2018 have you plugged it in to check the live data for the throttle pedal? im assuming its on the discovery mentioned in your signature? Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 28, 2018 Author Share Posted May 28, 2018 Mike Yes the AA plugged it in and the throttle response was on the button. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted May 28, 2018 Share Posted May 28, 2018 The refresh rate on diagnostic tools is nowhere near quick enough to diagnose a faulty throttle pedal on a TD5. There are 2 ways to prove the throttle pot is faulty, substitution or with an oscilliscope. Often the 5v supply to the throttle pedal is corrupted by other 5v sensor feed wires shorting against the cylinder head on Discoveries and also the gearbox or transfer box on Defenders. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 28, 2018 Author Share Posted May 28, 2018 Ally where is the throttle pot? I have a couple of spare disco's so it will be very easy to switch them over. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted May 29, 2018 Share Posted May 29, 2018 Its part of the actual throttle pedal itself,but be careful there are 2 and 3 track types,the ecu needs to know which type is fitted - Use Testbook or Nanocom etc to set the ecu. Its a long time ago,but I think there are part numbers on them. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted May 29, 2018 Share Posted May 29, 2018 with a nanocom you can see what the pedal voltages are, id be inclined to do some more diagnostic work on it rather than loading the parts cannon Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted May 29, 2018 Author Share Posted May 29, 2018 The parts canon is well and truely loaded I have two full ES's for spares so there are no shortage of certain items. Think it is going into a garage to get it sorted I know it will be something obvious once it is on the computer. Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted June 5, 2018 Share Posted June 5, 2018 On 5/27/2018 at 9:28 PM, Simon_CSK said: The AA were called and there was oil in the red ECU plug which he cleaned out with contact cleaner.............. I ordered and new loom for the injectors. After that was fitted it would only tick over and that is where we are today. The oil at the connector to the ECU will definitely be an issue, I'd suggest removing the plugs and giving them a good soaking with contact cleaner, on both plugs and sockets. The new harness is a good start, but remember, the loom from the head to the ECU is still saturated with oil that needs to be cleaned off regularly. Did you spray the connector at the head when you fitted the new harness, too, as the oil gets into the engine bay loom at that point? Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 6, 2018 Author Share Posted June 6, 2018 On 6/5/2018 at 7:07 AM, JohnnoK said: The oil at the connector to the ECU will definitely be an issue, I'd suggest removing the plugs and giving them a good soaking with contact cleaner, on both plugs and sockets. The new harness is a good start, but remember, the loom from the head to the ECU is still saturated with oil that needs to be cleaned off regularly. Did you spray the connector at the head when you fitted the new harness, too, as the oil gets into the engine bay loom at that point? John Thanks for the reply. Have sprayed contact cleaner in huge amounts everywhere with no change. Tried to change the throttle pot on Sunday but that made no difference so we are back to the loom or the injectors. Getting it put on a computer on Monday. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted June 7, 2018 Share Posted June 7, 2018 i would say its the loom rather than the injectors, Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted June 7, 2018 Share Posted June 7, 2018 So, you are only able to run the engine at idle still ? If that is the case its not going to be the injector loom or the injectors.If it will start and idle on 5 cylinders then they are doing their job. You need to look at why it won't rev. Here there are a few options, as I said before the most likely is that the 5v supply is being corrupted, (Driver demand 5v supply comes from the same source in the ecu as all the other 5v fed sensors) often a sensor feed wire rubbing the cylinder head or block around the front of the engine. The 5v supply itself can also fail within the ecu,( I have one on the shelf that has failed in this way) but this is not so common. There is also the possibility of failure of the actual driver demand part of the loom,but this is more common on Defenders where its a common work around to replace that part of the loom with a length of 7 core trailer cable. I would say at this stage diagnostics is the way forward before any other parts are changed. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 7, 2018 Author Share Posted June 7, 2018 I have a spare ECU and BCU so will try that next in leu of the diagnostics. Gives me something to do before Monday. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted June 8, 2018 Share Posted June 8, 2018 Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 10, 2018 Author Share Posted June 10, 2018 On 6/8/2018 at 9:08 AM, RedLineMike said: Locked and Loaded lol That rules out the ECU and the BCU as both now switched and still just ticking over. That leaved the injectors and the engine wiring loom. Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted June 10, 2018 Share Posted June 10, 2018 As I said,if it will start and idle its not going to be the injectors, I'd be putting money on the loom around the engine being shorted to the block or head somewhere,killing the 5v supply to the throttle pedal. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 10, 2018 Author Share Posted June 10, 2018 3 minutes ago, Ally V8 said: As I said,if it will start and idle its not going to be the injectors, I'd be putting money on the loom around the engine being shorted to the block or head somewhere,killing the 5v supply to the throttle pedal. Ally Just trying easy things with parts to hand. Unfortunately the looms on the other two disco's have more oil that the one in the car so there is little point in switching that. Am thining I could replace the wiring from the injector loom to the ecu. Quote Link to comment Share on other sites More sharing options...
RedLineMike Posted June 11, 2018 Share Posted June 11, 2018 its not the injectors, this 12 hours ago, Ally V8 said: As I said,if it will start and idle its not going to be the injectors, I'd be putting money on the loom around the engine being shorted to the block or head somewhere,killing the 5v supply to the throttle pedal. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted June 23, 2018 Author Share Posted June 23, 2018 Quick question. Would the engine tick over without the crank case sensor connected? I have been stripping the old engine wiring loom out to replace it and think one of the wires may be broken. Given the age and milage of the car I am not to concerned about replacing this regardless. Quote Link to comment Share on other sites More sharing options...
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