D4d Obdii, Reading Fault Codes Options

[anchorman]

Thanks Anchorman,

I'll run through the tests and see if that identifies an issue.

Hello
First time on the site with the exact fault as you have stated bringing me here (loss of power and engine light). Pulling over and turning off the engine clears the fault until it decides to re-occur. I've paid two toyota garages to diagnose fault and findings are code 34 and estimate of £2K for Toyota to fix (quoting new turbo).

I'm no mechanic but technically competent and having removed and inspected the turbo I reluctantly decided to get a refurb done on my Turbo at Midland Turbo. Had the refurbed turbo refitted and not surprising the same fault returned within half a mile.

Would be good to hear whether you've had any joy using Anchorman's pressure valve diagnostic process.

Anchorman
Just in case no reply from Codswallop, would be good to also receive the electric diagnostics process.


Thank for any help received.

Patko.

Of course mate - just pm me with your email address as they come as pdf's

And while I'm at it - welcome to the club.

Hi there,

I'm new to the site and have a 2005 2.2d 3 door Rav4 (with round spotlights) bought from new and has given 40000 miles troublrefree motoring.

A day before it was due for its 40,000 service it started "missing" under full acelleration. The Toyota main dealer said the code readout was turbo overpressure and was due to fuel contamination but after 2 changes of fuel filter and several tanks of diesel the problem has got worse with the engine shutting down and the engine management light coming on. Restarting cures the problem and momentarilly disconnecting the battery resets the engine management light until the next harsh acelleration. Driven gently the car performs normally.

I have performed the electrical checks on the scv's and vcv's as per shown on this site and all seems well. The dealer wants to drain the tank, flush through etc but from your information here I don't think this is the problem and I will end up being charged 2 grand for a new turbocharger.

Is the only way forward to buy one by one replacement sensors until the the problem one is found?

Also, I found that by disconnecting the turbo pressure sensor cured the problem but of course reduced performance. Is there any significance in this?

Thanks for any advice you can give

Welcome to the club.

This is the VSV which regulates the turbo pressure so I would give this a good looking at;

 vsv.pdf ( 76.53K ) Number of downloads: 57


........and this shows ho to test it;

 vsv_test.pdf ( 61.13K ) Number of downloads: 44


They are located just near the RH side of the intercooler as you look under the bonnet. While you are at it, just check the vac pipe to the turbo vac unit for leaks and try to make sure that the linkage is working and free.

[saffron]

Thanks anchorman for the VSV info. Continuity checked out ok at 41 ohms and there is no continuity from either terminal to the body.

There is, however, a small but definite air flow from port e to g on your diagram and no flow to the filter.

I have not yet been able to perform the last check with a battery connected as I do not have a suitable connector at the moment. I did try it connected back up to the engine with the ignition on and there was no flow to the filter but not sure if current would be flowing under static conditions. I will rig something up to do the test as per your diagram. Presumably it needs the current of the car battery to operate the solonoid?

Many thanks again for your help

[anchorman]

Thanks anchorman for the VSV info. Continuity checked out ok at 41 ohms and there is no continuity from either terminal to the body.

There is, however, a small but definite air flow from port e to g on your diagram and no flow to the filter.

I have not yet been able to perform the last check with a battery connected as I do not have a suitable connector at the moment. I did try it connected back up to the engine with the ignition on and there was no flow to the filter but not sure if current would be flowing under static conditions. I will rig something up to do the test as per your diagram. Presumably it needs the current of the car battery to operate the solonoid?

Many thanks again for your help

Yes, they are just asking for a 12v supply to test.

[saffron]

Thanks anchorman for the VSV info. Continuity checked out ok at 41 ohms and there is no continuity from either terminal to the body.

There is, however, a small but definite air flow from port e to g on your diagram and no flow to the filter.

I have not yet been able to perform the last check with a battery connected as I do not have a suitable connector at the moment. I did try it connected back up to the engine with the ignition on and there was no flow to the filter but not sure if current would be flowing under static conditions. I will rig something up to do the test as per your diagram. Presumably it needs the current of the car battery to operate the solonoid?

Many thanks again for your help

Yes, they are just asking for a 12v supply to test.

[saffron]

Thanks Anchorman,

Have now completed the 4 tests you specified. Tests 1,2 for resistance and insulation from body and test 4 with battery connected check out as per your data sheet. Test 3 did show some air flow from port e to port g contary to the data sheet . Is this sufficient grounds for replacing the VSV?

As always, thanks for any guidance you can give

[raverchris]

Hello again

Since the last post I have checked again. The fault code 34 has now changed into fault code 97.

I have checked the SCV's with help from Rupert's excellent post. I did find the connectors difficult to remove in the limited space and eventually resorted to using a large flat bled screwdriver in one hand to gently lever the connector the forward, whilst squeezing the release mechanism with the other hand. Once started it was the relatively easy to wiggle the connector about whilst pulling it.

Anyway both SCV's seem OK. No short circuit to earth and 1.5ohms between pins @10deg C in each case.

I also pulled apart and remade a few other connectors and in the vague hope of spotting some connector problem.

Thanks to your earlier info Anchorman which points to an EDU malfunction. If the EDU malfunctions do you think its possible for it to display an unallocated flash code like 34?

Any ideas where I should go from here? (Apart from down the pub while I still have some money in my pocket)

If suspect the answer is on this site somewhere but I just haven't seen it, so if someone could point me in the right direction I will be eternally grateful.

Just bear in mind that the electrical side of the SCV's can be ok but the mechanical side is not so will still give the problem even though the electrical side checks out ok. This was the case with mine - electrical checks all ok but not mechanically. Changed them and cured the problem. No idea if you can check the mechanical side of ths SCVs before replacing them?

Took the words right out of my mouth! No quick way of testing the physical side I'm afraid unless you have something for checking fuel rail pressure. A specialist might help or you'll have to take a chance.

RAV was becoming difficult to start and at long last after limping back 200 miles from Cornwall I decided to something about it and bought a pair of SCVs from the Parts King. Very helpful info from Rupert. It took me about 3 hours, mainly because of the flexible fuel line that kept getting in the way of the back SCV and nudging my Allen key or driver into inaccessible places to be retrieved with a magnet. Good tip on doing the difficult one first, while I still had the patience, the second one was a breeze and took about 10 mins.
I must say, I still had my doubts that this would cure the problem (pessimist), but lo and behold, started first tiime - problem gone - 10% improvement in fuel consumption
Thanks again Anchorman for pointing me in the right direction, Kingo for the excellent service, and Rupert for your useful article.

[anchorman]

Glad you are sorted

[saffron]

Glad you are sorted

Hi there,

After putting up with the same "missing" and "limp mode" problem for months and performing the electrical continuity and isolation tests I was encouraged by raverchris's post to solve the problem as he did by replacing the SCV's. Ordered them from PartsKing and recieved two days later (great service) and fitted them following Rupert's excellent post on how to do it.
Result is no change, problem still exists. I have also checked the VSV's as per Anchorman's pdf file TC-24 and all seems ok except on test number 4 which says air should NOT flow from port e to port G when de-energised which on my valve it does. Should the instruction read SHOULD flow from e to g when de-denergised as the drawing clearly shows or do I have a faulty VSV?

Also, I now have a pair of used (40,000 miles) SCV's but proven servicable if anyone wants them.

As always, thanks for any help anyone can give

[anchorman]

If it goes into limp mode you should be getting an error code. Just remind me what it is?

[saffron]

If it goes into limp mode you should be getting an error code. Just remind me what it is?

Anchorman, many thanks for your prompt response. I don't have a code reader but when the problem first appeared I took it to a Toyota dealer who said the fault code was Turbo overpressure, but suspected contaminated fuel was the problem. I've had numerous tanks of fuel and changed the fuel filter twice since then so it can't be that.

[saffron]

If it goes into limp mode you should be getting an error code. Just remind me what it is?

Anchorman, many thanks for your prompt response. I don't have a code reader but when the problem first appeared I took it to a Toyota dealer who said the fault code was Turbo overpressure, but suspected contaminated fuel was the problem. I've had numerous tanks of fuel and changed the fuel filter twice since then so it can't be that.

Anchorman, any thoughts on my reply to your question above about the error code?
Thanks in advance

[anchorman]

I think you should get a code reader (type U480 into ebay) and check it. I don't see how contaminated fuel can cause it as the sytem will vent surplus pressure regardless of what has caused it. Lets be sure of the code and then I will post the pdf's with the test and rectification procedures.

Cheers

[saffron]

I think you should get a code reader (type U480 into ebay) and check it. I don't see how contaminated fuel can cause it as the sytem will vent surplus pressure regardless of what has caused it. Lets be sure of the code and then I will post the pdf's with the test and rectification procedures.

Cheers

Thank Anchorman, will do and advise soonest.

[Alex-malta]

I think you should get a code reader (type U480 into ebay) and check it. I don't see how contaminated fuel can cause it as the sytem will vent surplus pressure regardless of what has caused it. Lets be sure of the code and then I will post the pdf's with the test and rectification procedures.

Cheers

Thank Anchorman, will do and advise soonest.

hi there,

I have been experiencing the same problem. I replaced the SCV's and I must admit that there was an increase in power from the car, as well as better starting of the engine. This notwithstanding I have not solved the problem and i am still experiencing the intermittent errors. The VSV problem seems very interesting as thats what the mechanic thought at first (he tried to blow into it to see if it works.) The error i am getting is P1251. We have a problem with contaminated fuel as well (and being small we have only two or three improters of fuel) but I have talked to many rav owners locally and no-one seems to complain. It's logical that if I get faults due to contaminated fuel someone else on the island is to get it as well.

Whatever the problem is I recomend that you do not change the turbo. I got mine cleaned up and reconditioned (labour here is not that expensive) but it didnt solve the problem.

I also cleaned the hot wire sensor but didn't make a difference.

Hope to test it this evening and will tell u about it.

cu
alex

[raverchris]

I think you should get a code reader (type U480 into ebay) and check it. I don't see how contaminated fuel can cause it as the sytem will vent surplus pressure regardless of what has caused it. Lets be sure of the code and then I will post the pdf's with the test and rectification procedures.

Cheers

Thank Anchorman, will do and advise soonest.

hi there,

I have been experiencing the same problem. I replaced the SCV's and I must admit that there was an increase in power from the car, as well as better starting of the engine. This notwithstanding I have not solved the problem and i am still experiencing the intermittent errors. The VSV problem seems very interesting as thats what the mechanic thought at first (he tried to blow into it to see if it works.) The error i am getting is P1251. We have a problem with contaminated fuel as well (and being small we have only two or three improters of fuel) but I have talked to many rav owners locally and no-one seems to complain. It's logical that if I get faults due to contaminated fuel someone else on the island is to get it as well.

Whatever the problem is I recomend that you do not change the turbo. I got mine cleaned up and reconditioned (labour here is not that expensive) but it didnt solve the problem.

I also cleaned the hot wire sensor but didn't make a difference.

Hope to test it this evening and will tell u about it.

cu
alex

Hi Guys

Guess what - after a few thousand miles of trouble free motoring the engine light is back again.
I have manually downloaded the codes using the flash method (earlier help from Anchorman) and they are:
34 (which doesn't seem to exist), 97, and 78.
I'm thinking, hopefully, of a bad connection in the SCV circuit. In changing the SCV's, did I disturb something in the wiring/connectors that corrected the problem for a while?
As soon as I've had a look I'll report back, but it might be a while - the problem with waiting for intermittent things to go wrong.
....and if anyone knows anything about code 34 (great title for a novel) please let me know.

Cheers for now
chris

[in_the_no]

CODE 34 exhists but i have removed it, fed up of assisting for others to KNOCK.

[Alex-malta]

CODE 34 exhists

Hi I tried the VSV.
Apperently air flows form point E to g or vice versa i'm not sure but anyways I'm going to order one from parts king. about 65sterling. very easy job to replace -

btw the error I got was P1251 - something to do with step motor for turbo

Hope it works!! will keep u posted.

I was reading other threads - could it be the injectors??

[raverchris]

CODE 34 exhists

<Many thanks for that - I guess a poke around under the bonnet is in order.

[saffron]

Hi,

Since my last post on Nov 25th and following recommendations from Anchor man, I have found the cause of my " engine missing, management light coming on and going into limp mode" problem which turned out to be the VSV. It seems that even the smallest detectable leak of air from port e to port g when de-energised is enough to cause the problem, otherwise the valve checked out ok.

While waiting delivery of a new valve, and figuring that some lubrication couldn't do any harm I sprayed WD40 into all 3 ports and took the car for a test drive. The problem disappeared and the engine rev'd freely well above 4000 when previously it would not go above 2000.

I'm sure this won't be a permanent fix but so far, after about 1500 miles it is still working ok so I am holding off fitting the new valve for a while. Hope this info helps others and again, many thanks to Anchorman for guidance

[anchorman]

Good work saffron and full marks for your tenacity. With a bit of luck you may well have solved one of the most popular RAV problems and other will indeed benefit.