Ideas for improving the 2LTE (1 Viewer)

[GTSSportCoupe]

Hi Nick!

Here's another substantial update, so TT And E1 checks the transmission codes and not W and E1(basing it on a post in the surf forum).

So anyway, my OD OFF blinks 4 times then 2 times. That means code 42 correct? According to Toyota Generic OBD1 codes list it points to Vehicle Speed Sensor. I ordered the "speed sensor no. 2" which is the MAIN speed sensor that the 2LTE relies on which is attached to the tranny housing. But of course if you have a different interpretation of those codes please do go and shoot. Btw I also ordered a tranny temp sensor(dont worry am not throwing money at the 2LTE haha its just that Im stocking on these parts from the US as they are not available in Asia).

Regarding the spill valve, i believe i have turned it 1 full turn already at one point and I feel like its not doing anything. I did get a dyno last year and the reading did say i was running way too lean and thats why I dont know if it is safe for me to assume that a mechanic before probably turned it down? That I dont know. Again, its best for me to take it one step at a time and that is to correct this particular tranny code and address the acceleration issue as it still persists but again erratic.

Happy Holidays!

Touie

Hi Touie,

To be honest, I've never checked my transmission error codes. I looked at the LJ78 schematics, and I see that there is a separate computer for the transmission. I've only ever checked codes from my ECD computer, but never the ECT one. Very cool to know it can be done.

I'm pretty certain you are correct about the code you have (see table of codes below that I found). Any chance there may be a problem with the wiring somewhere? Your truck was re-wired at one time right? I did find the wiring diagrams for the Japanese 1990 70 series. You can find the links here: Dropbox - Toyota LJ:KZJ 70-Series Wiring Manuals

Good luck with it!

Nick

 

[Touiederosas]

I grabbed all those docs like theres no tomorrow hahaha. Thank you so much. When my speed sensor arrives(it was only 70 USD) I will replace mine and see if that fixes the issue. If not, I will try to dig in the wiring of the tranny And keep you posted.

Regards,
Touie

 

[jim7564]

New to this site so not sure if this is the right place to post here or not but seems related to some stuff on here,
stumbled on here trying to find info on these engines and tons of info,
just re engined my hilux surf 2LTE as it overheated when the waterpump collapsed,everything was running fine until then.anyway took engine out and another secondhand (supposedly good running engine) in its place,wouldnt start found there was no power at the spill valve/shut off solenoid so i ran a wire from an eart to connector and showed 12v(when ignition on),got it fired up eventually and the revs just kept increasing so turned it off but the engine kept going even took key out but still kept going,only way to stop was in gear with brake on to make it stall.
i should mention i bought the bare engine with the fuel inj pump,all other stuff turbo/inlet manifold etc came off the old engine,
so i can fire it up for 10 seconds without touching the throttle and it stops,fire it up with your foot down and it will keep going but will not stop revs just keep increasing,slight oil leak out the turbo (seals i think) and noticed yesterday the water pump looks like its gone but i would expect it still to run and idle normally despite this.
havent checked for codes yet
anyone had this problem at all.
cheers Jim from sunny scotland

 

[GTSSportCoupe]

New to this site so not sure if this is the right place to post here or not but seems related to some stuff on here,
stumbled on here trying to find info on these engines and tons of info,
just re engined my hilux surf 2LTE as it overheated when the waterpump collapsed,everything was running fine until then.anyway took engine out and another secondhand (supposedly good running engine) in its place,wouldnt start found there was no power at the spill valve/shut off solenoid so i ran a wire from an eart to connector and showed 12v(when ignition on),got it fired up eventually and the revs just kept increasing so turned it off but the engine kept going even took key out but still kept going,only way to stop was in gear with brake on to make it stall.
i should mention i bought the bare engine with the fuel inj pump,all other stuff turbo/inlet manifold etc came off the old engine,
so i can fire it up for 10 seconds without touching the throttle and it stops,fire it up with your foot down and it will keep going but will not stop revs just keep increasing,slight oil leak out the turbo (seals i think) and noticed yesterday the water pump looks like its gone but i would expect it still to run and idle normally despite this.
havent checked for codes yet
anyone had this problem at all.
cheers Jim from sunny scotland

Hello, the Spill Control Valve in the 2LTE is pulsed by the engine computer, it does not get a constant 12V like a fuel shut off solenoid in a normal mechanical injection pump. Did you connect 12V constant to it? If so, it may be damaged now. It may have been damaged before too. When I adjusted mine too much (adding fuel), it stopped pulsing properly, and my engine went into run-away too. So it sounds to me like yours is not working right.

You could check the resistance of the Spill Control Valve. I believe it should be around 1-2 Ohms. If it checks out ok, your problem may be else where.

 

[jim7564]

the connector on the side of the inj pump,as far as i can make (maybe misread something) out this needs 12v to open the solenoid to let fuel up to the injectors,when ignition is on there was no power but if i put a voltmeter to the connector + and the - to the engine/earth i had 12v.
if its been damaged will it be at the pump or the ECU,

 

[GTSSportCoupe]

@jim7564 OK, there are four connectors on the side of your pump. The top one is for the Spill Control Valve. It definitely gets pulsed by the computer, as that is what controls how much fuel is injected each injection event. The two middle plugs are correction resistors, which will not interfere with your engine running, they are just to fine tune the fuel/timing parameters based on the pump characteristics. The lower plug (that came unclipped from the bracket) goes to the timing control valve. This also gets pulsed and controls the injection timing advance.

You can test the Spill control valve by disconnecting the top square connector and measuring the resistance between the two terminals that go to the top back of the pump. You should measure 1-2 Ohms I believe.

You can test the Timing control valve by disconnecting the bottom round connector and measure the resistance between the two terminals that go to the bottom of the pump. You should measure 10-14 Ohms I believe.

Do not apply 12V constant to either one of them. If you did, and you think something is wrecked, it'll be the solenoid and not the computer (assuming you applied the power to the pump side of the connector). But basically, if you measure the resistances and they are ok, the solenoids are probably fine and your problem is somewhere else.

If you jumper T1 to E1 in your check engine connector your check engine light will start blinking. You can use this to check the engine codes. This will tell you what the computer is unhappy with and might lead to your problem. Otherwise, make sure you check all your grounds etc.

 

[jim7564]

thanks for that,yes i ran a wire -neg to the connector and plugged it in,(possibly done some damage then) will try codes tomorrow if weather permits (stormy here) have my old pump if need be but would rather not touch that.
i have looked on the internet for weeks and weeks and kept coming up with this site so with the info here i would be stupid not to join up.will def be doing a lot of these mods suggested here to improve power and life of these engines,my old engine can be turned over with one hand at the crank pulley.when the waterpump collapsed i was 10 mile from home thinking it was just a fanbelt i carried on but the damage was done,have a new waterpump and another turbo to fit if i can get it running first.
love the truck their great workhorses when they go,too many projects LOL
THANKS AGAIN

 

[jim7564]

well GTSSportscoupe you were spot on with your assement,took the wire of the connector and it fired up no bother at all,THANKS AGAIN,my head was done in with this thing,now to the waterpump/turbo an a leaking injector to sort,
Again thanks for your help,

 

[advlars]

Were you able to test the resistances? Any damage done? Perhaps you can pull the TCV and SCV off the old pump without actually swapping the whole pump and messing up your timing?

 

[jim7564]

i didnt bother as yet,started truck up and it idled fine pressed the high rev button and revs went as normal,checked engine and theres a leak at one of the injectors,plus there hardly any water in it,moved the truck about 20 ft out of the cold wind and started to dismantle everything to replace the waterpump,
i was just that happy it was running didnt think to check anything else LOL.just the crank pulley to get off now but havent got any pullers so ordered one but be a few days yet.
atleast things are moving in the right direction again,was all out of ideas as what to do next,next thing is a set of 31x10.5x15 tyres,
heaps of info on here which is great as i know very little about these trucks

 

[GTSSportCoupe]

i didnt bother as yet,started truck up and it idled fine pressed the high rev button and revs went as normal,checked engine and theres a leak at one of the injectors,plus there hardly any water in it,moved the truck about 20 ft out of the cold wind and started to dismantle everything to replace the waterpump,
i was just that happy it was running didnt think to check anything else LOL.just the crank pulley to get off now but havent got any pullers so ordered one but be a few days yet.
atleast things are moving in the right direction again,was all out of ideas as what to do next,next thing is a set of 31x10.5x15 tyres,
heaps of info on here which is great as i know very little about these trucks

There is also this forum which is based in the UK and covers the Hilux Surf specifically: Hilux Surf Forum - Powered by vBulletin

And this one in Australia: Toyota 4WD Surf Owners • Index page

Both of those have much more info on the 2LTE than IH8MUD has.

 

[jim7564]

thanks again,i looked on the hilux surf forum but could not find any info,it was only googling the problems it kept coming up with this site,there is that many different versions of these trucks.once it sorted then will look out for an intercooler,

 

[Touiederosas]

Hi Nick and everyone on this thread.

Just an update on my LJ78. Some months back, I encountered an issue where my truck's acceleration randomly slows down as if it feels like it starts in 3rd gear.

I shorted E1 and TT and pulled a code pointing to the transmission speed sensor. It was almost impossible to find as almost all dealerships in the US(I looked here because the USDM Previa also has an A343F transmission) had no more stock as it was a discontinued part. Luckily, when I randomly searched Ebay there was 1 available that was slightly used from a surplus shop in Sacramento. I patiently waited for the item to arrive here in the Philippines for about 2 weeks and finally got to install it yesterday.

GOOD NEWS: I shorted TT and E1 again and the code is gone! Power is much more consistent and highway driving(shifting) drives way better, not to mention it revs up when i put my foot down while cruising(this was erratic before)

NOT SO GOOD NEWS: My OD OFF light still blinks upon start up after moving a couple of meters and shuts off after another couple of meters of moving. I understand that our LJ78's are not supposed to do that as when the OD OFF light starts to blink at one point in time, it puts our transmission in FAIL SAFE mode because there is an error still right? I did experience the slow acceleration again trying to get out of a stoplight at green but that was the only time I experienced it yesterday.

Any ideas? Is there an OBD1 specific scan tool that might be more sophisticated in pulling out codes since I can't get any anymore through shorting via the diagnostic box? Any help would be appreciated as I'm in the "home stretch" of making my LJ78 operate correctly(it has been putting more smiles than frowns on my face recently)

Cheers everyone!
Touie

 

[Touiederosas]

Hi guys!

Okay solved my OD OFF light blink problem! It was indeed a wrongly wired TCM - ECU thing. Anyway, moving on. I removed the spill valve strainer and "exit line" of the pump and cleaned the heck out of them, also cleaned up the fuel lines in the injector area.

Results were awesome, diesel flows in good and power is really good, i could tell because my EGTs would go up quick as opposed to before that was the opposite.

Here's the real issue, its been mind racking. After 30 mins of driving, revs are significantly slower once again(EGTs are so hard to get up), so I'm suspecting its a fuelling issue. Or could it be that my TPS is bad? Does that make sense that the TPS would be erratic after 30mins of driving/x number of pedal presses?

Hoping to hear from you guys soon! I really cant wait to get this truck consistent because its sad that its like a V8 for 30mins and a turtle for the rest of the drive.

Thanks again,
Touie

 

[advlars]

Any other symptoms? Coughing, smoke, etc.? Im having similar trouble with my 5lt (mechanical injected but similar). Mine gets great power and boost but after a bit it starts to cough and spit smoke under load and loses power and egts. Best guess Ive got right now is air in the lines, or the pump sucking air? Maybe you didnt get your hoses all on tight when you pulled and cleaned them? Maybe I didnt either? Kinda guessing here...

Everything goes back to normal for you after cooldown? What if you just shut it off for a few minutes and drive again while hot?

Wouldnt make much sense for a TPS to act up after 30 minutes as far as i can figure....

 

[Touiederosas]

Any other symptoms? Coughing, smoke, etc.? Im having similar trouble with my 5lt (mechanical injected but similar). Mine gets great power and boost but after a bit it starts to cough and spit smoke under load and loses power and egts. Best guess Ive got right now is air in the lines, or the pump sucking air? Maybe you didnt get your hoses all on tight when you pulled and cleaned them? Maybe I didnt either? Kinda guessing here...

Everything goes back to normal for you after cooldown? What if you just shut it off for a few minutes and drive again while hot?

Wouldnt make much sense for a TPS to act up after 30 minutes as far as i can figure....

Hi!

All is tight and sealed, my friend swapped in a 1kz so I bought his 2LTE pump(301 part number) for dirt cheap. Will try it out in a few hours as its being installed right now.

First time for me to pull my pump out and the speed sensor nut on top has alot of teflon, looks like it was tampered with before(i suspected the speed sensor because I got a code 6 too).

So sorry, i know nothing about any other engines except for the 2LTE by following the footsteps of GTS(Nick) hahaha!

Cheers,
Touie

 

[advlars]

@Touiederosas,

Howd that new fuel pump turn out?

FWIW I seem to have fixed my similar issue (power loss after driving for a while) by replacing the fuel filter and all the fuel lines under the hood. Im guessing the fuel filter was the culprit. Maybe your filter is getting a bit old as well?

 

[Touiederosas]

@Touiederosas,

Howd that new fuel pump turn out?

FWIW I seem to have fixed my similar issue (power loss after driving for a while) by replacing the fuel filter and all the fuel lines under the hood. Im guessing the fuel filter was the culprit. Maybe your filter is getting a bit old as well?

Hi!

I forgot to update this thread but yes the new pump did the job! Its as consistent as can be. Im pretty sure it was my speed sensor that was pretty faulty since it did store that code some months back. I also replaced my TPS and i have throttle response at all pressure presses. Unlike my old TPS(I think I damaged it when I had an engine wash) i would only have responce at 1cm press and hit or miss if i floor it, anything in the middle had no response at all.

I'm very happy with the truck, it does feel like a 13BT haha! Waiting for the WAIC to arrive so that I can have the exact replica of what Nick has, funny thing is that our color schemes are exactly the same too

Cheers,
Touie

 

[Touiederosas]

Hi guys!

Just sharing a picture of my truck. Thought it would be perfect to do so after sorting out its issues.

Cheers,
Touie

 

[advlars]

God damn!! Looking good. You've taken good care of that thing! But where's all the mud??