P0093 Help Needed To Decipher Data

[mackemade]

i cant believe that, but the reality is that it is temp related as if its over 10c mine does not do it, what the hell is a injector controller ?

i have had a reply back from lexus and they have said they would like to do a further investigation, so i am happy for them to do that as i dont now believe that it is the pump or the injectors so i am waiting for them to get back to me and arrange it. 

 

[Badger1966]

I have done some general reading about P0093 and have come up with a possible answer. One thread said faulty wiring at injection control module and also at fuel pressure sensor. As everything that can be changed has been I am seriously considering it may be a wiring fault ? Also I have been caught in the past with simple bad earth connections. So next step is out with the multimeter! And to that end, here are a few of pics...

 

[Badger1966]

First point of call E84, E85, E86, E65, E68, E69 and E70. I will check the wiring back from these points as best I can. And also check the earth points E3 and E4. Although I am not sure when I will be able to start this task, but it will have to be sooner rather than later.

[Badger1966]

1 hour ago, mackemade said:

i cant believe that, but the reality is that it is temp related as if its over 10c mine does not do it, what the hell is a injector controller ?

i have had a reply back from lexus and they have said they would like to do a further investigation, so i am happy for them to do that as i dont now believe that it is the pump or the injectors so i am waiting for them to get back to me and arrange it. 

 

I Think it is the thing connected to E84, 85 and 86 in the diagram. And good luck with the further investigation, everything crossed for you!

[Badger1966]

And temperature thing is the same for me. I have lost count of the times I have reiterated this point to lexus. Having said that the cold makes things contract and heat makes things expand. So could be wiring. Poor connection in the cold, more heat and expansion makes contact.

[mackemade]

so have they returned the car to you? 

there may be one other thing, when the car puffs out it the grey smoke, it ususally does this just before it goes into limp mode. 

that i think could be an indication that car is going into regen mode, but it would be too cold to do that. 

however if it was opening the 5 th injector it might show a drop in fuel pressure and come up as that fault code 

this code appeared on mine directly after i had to do a long run to regen my DPF, so i wonder if it is a software issue ? If the ecu is still telling the car to regen 

what do you think?

 

 

[Badger1966]

I get the car tomorrow after they try the MAF and injector thing. I expect the car knows the 5th injector is using fuel so would compensate in some way. And mine doesn't smoke any more. In fact the car has smoked less and less the more severe the problem has got. And I haven't seen it smoke since I had the air fuel ratio sensor done. I think the smoke is a red herring. And my DPF and 5th injector is fine. And did the long run actually regen the DPF? How do you know the regen happened? And on the ECU note, Lexus think it is a possibility the problem is the ECU, but again clutching at straws.

[mackemade]

It did as the fault code that preceded the current one was p2002 if I remember correctly . That one has not return ed . And all the warning lights cleared so I take it the Regen was completed .  Also the mpg went up . Maybe the things they change tomorrow will sort the problem but I am with you they are guessing now I feel 

[Shahpor]

Where did you find those diagrams Gary?

I suppose at this point, a wiring fault is as good a guess as any.  I hope you find something wrong.  I would really like this to have a happy ending; or rather, a less unhappy ending.

[Badger1966]

I found the diagrams in a secret place, hehe. I stumbled across them and took a screen shot... And more than anything, I want a happy ending. I almost don't care if the car lives or dies any more. But I would give my right arm to find the fault.

[KC14]

Hi Gary,

I can't believe this is still ongoing buddy, you must have spent quite a bit by now!

Be mindful that you don't spend over the cars value, plus all the hours you put in. I really do feel for you, personally I think the is220d is a money pit when things go wrong. Thumbs up to your perseverance, I really hope you get somewhere with this and sort it. Good luck buddy.

Can't believe the Lexus techs can't solve this one, are they not the experts!?

Sent from my Iphone using Lexus OC

[mackemade]

hi gary, 

i take it  the latest lexus fix has proved to be unsuccessful? 

i am waiting for them to contact me to to arrange when they are going to do further investigation, in the mean time i have being have a bit play with the car. 

i  have noticed that when it revs between 1000 and 1800rpm, there seems to be a slight misfire, the higher the revs go it disappears, also i can keep revs at between 2 and 3000rpm and it will not cut out as long as the engine is not under load. 

so i have ordered 2 injectors off eBay and will have them fitted, as they did say there was an excessive leak off on 2 injectors so that might explain the misfire at low revs and i thought it was worth a go for the sake of £400

also is there any link between the fuel system and the turbo 

 

[Badger1966]

Well good luck Mackemade. And your right, epic fail! Lexus officially can't fix a Lexus. Could this news go viral? What are the implications? But, when I picked it up from Lexus, it was cold, and it only went into limp mode twice. Now thay obviously disturbed the wiring when they fitted the injector control module. So I am going to try one last thing, replace the wiring loom. I have messaged many ebayers to see if I can get a second hand loom. I can't bare the thought of going through one wire at a time testing them. Although it looks like a task in itself changing the loom. But I think it will be easier and no chance of missing anything. I am waiting for responses and if I can get one cheap enough I will try it.

The Lexus is now off the road, I have brought the Jeep, 4x4 fun, here we come!

[Badger1966]

OMG, people are wanting anything from £100 to £250 for that bit of loom, madness. Most breakers wouldn't even keep something like that. Some even wanting me to take it off the car, crazy people! I was thinking £50 or something like that and I would give it a go. Gonna have to search locally I think...

[mackemade]

good luck with that , i cant believe that they have given up. Me personally i would have left the car with them until they fixed it. well that is what i will do.

the only thing with the electrical problem is why does it not do it when the car is stationary. 

like i said mine will not go into limp mode if it is just sat revving it only does it when its moving. 

i have to say i don't envy you having to replace the wiring loom or are you only doing the part between the injector control unit and the injectors?

enjoy the 4x4 i have shogun sport , agricultural engineering love it 

 

[mackemade]

i think you are right, its because its a lexus they just make the price up, i go on the breaker link websites, just got 2 injectors for £175.00 delivered, ebayers want that per injectors.

 

i have also bought a leak off test kit so i can check them myself  

 

lexus have not got back in touch as yet, i think they have been reading this thread..lol

[Badger1966]

Mines goes into limp stationary with no problem at all! lol. My limp mode is more advanced than yours. Mine used to be like that, but it just got worse and worse. Unfortunately I expect the same will happen to yours as the symptoms are basically identical. They have changed everything possible from two different donor cars. There is no other component that can be tried. Except the wiring loom. And maybe the main ECU. But aparently they can only do the ECU if its brand new. Something to do with keys being coded to the ECU etc.

[Badger1966]

The easiest and cheaper option with the ECU would be to go to a specialist tuning company that can re-map the ECU

If I knew for sure it would fix, I would do it in a heartbeat.

[Badger1966]

One thing I am not sure if I mentioned before, is that it will only go into limp mode when stationary, or when off the throttle, as in coming to a stop or going down a hill. It has never, from memory, suddenly gone into limp mode while accelerating. Hovering the throttle, maybe, or off the throttle slowing down.

[mackemade]

that's interesting as moine will go into limp mode even if i am accelerating and it is always precedes a puff of smoke, 

how much do you think it would cost to remap the ECU

[Shahpor]

Has the dealer told you they have given up?  No way.  If so, I would contact Lexus UK and see what they say.  There is no such thing as can't be fixed.

As for the wiring loom, I wouldn't even want to contemplate redoing the wiring on a car like this.  The complexity must be ridiculous.  So good luck to you if you attempt it.

Oh, and didn't you tell the dealer to most important part?  Namely, the people on this forum that desperately want to know what is wrong.  

[mackemade]

The thing is that this has,happened to other d4d Toyota engines and up to now no one has a solution . So I would guess Lexus /Toyota are aware of it . 

[Badger1966]

Well indeed I did discuss the implications of more people suffering the same fault, and obviously those numbers are going to increase over time. And the fact that a solution must be found. I didn't really get an answer other then well we can't find a fault. They are very keen for me to keep in contact. Of course I am going to contact Lexus and give them both barrels so to speak. This problem is going to explode in their face eventually. But part of the problem is that I imagine most, or all of the cars suffering from this problem are out of warranty. Needless to say though, it is something that is a major problem for Lexus and Toyota, And how far are they going to go to maintain there image of quality and reliability?

The loom is just one part of a bigger loom, I will just be replacing one part, highlighted in green in the previously posted picture, Still a pain to do though!

Some one like "http://pandpauto.co.uk/"  are specialist in ECU re-mapping. You would need to find someone like them. I think bog standard ECU diesel re-map is around £200, but they may have to go a bit more in depth and take longer. I did read that a customer had some work done to fix a problem and it still went into limp mode. They did further work on the ECU and it didn't go into limp mode any more. It was like the ECU had got so used to going in to limp mode, even after a fix it wouldn't stop going into limp mode.

 

[mackemade]

i am going to do the injectors  ( as there was someone who did that and it worked, i will do a leak off test first)and after that i think i will get the ecu done, basically because  if  they can some how fool the ecu to ignoring the code and  stopping the car going into safe mode then it should be ok, as it only does that and shut down as a safety precaution, however there is really no need as its not doing any damage,

if they could do that , that would do as a fix for me, i would then take to lexus and trade it in..lol for an IS250

thanks for the link 

 

 

[mackemade]

your right, this might end up being a bigger problem as time goes on