HP Tuners for 2005-2015

@JustDSM

You really are a hero.

 

@OVTune
Can you please elaborate on unsoldering the immob board

 

Aight update from aus
So i dont think its the immob. Itll run and rev, then fall in the ass and shut down. It then requires a key cycle to get it to fire again for the shirt time it runs. I tried plugging the old one back in and turning the key. Hard no. Currently doing a immob reset back to the morse code binary that is the audm ecu. Do these reference from crank to cam angle after start up or visa versa at all? Scanner shows me nothing. Only error i had apon plugging im the taco ecu was an evap error. Theres a vin mismatch dtc that ive turned off also. Im fucken stumped.


Edit. Old shitheap ecm in and running fine. The ignition coils earth back through the taco ecu. A hilux just has a tumbleweed of white wires earthed on the block. Stab in the dark but thats where im at

 

Why don't you write your VIN to the Ecu?
It can be done with techstream.

Soldering the immo chip isn't the issue. If it was immo I think youd get no fire up at all.

 

Yeah i see that now that i tried with the old ecu after the reprogram. Is the vin
Swap that crucial? Also i dont have techstream.

 

Possible vacuum line on the intake surge tank underneath left off?

I did this after swapping plugs. It would fire right up then die after about 2-3 seconds. This is nowhere near much help on your level but figure it was something simple enough to get overlooked.

 

ill double check, i was fucking around with the fuse box and i have an aircon fault that is driving me nuts so i was prodding around that area of the engine before the ecu swap. once i put the old ecu in and reset to immob back to that box it started and ran fine. i havent done anythign with the VIN tho, i didnt think it was an issue. i mean i knew it could be but i was hoping it was jsut more a formality when doing a swap. plug and play ecus at work all the time to diagnose without altering the machine ID no dramas but thats a totallly different kettle of fish. hopefully @OVTune can word me up or any of the others that are in the know about it before i lose my shit. ive keep going through the wrong schematic aswell. everything checks out. i know @Philby has issues with his immob but back then im sure he said that the obd paperclip trick wasnt around yet and thats why he had to buy a master immob controller and key.

today was about fixing the aircon. now all i got is a dash in a thousand pieces, wiring errywhere and still rubbish vent temp

 

It's one less possible reason, if you write your VIN.

 

it kinda seems like one of them faults hey. ergh what a pain in the ass. it revs, grabs gear, no engine lights and all looks and feels fine, for 3 seconds. id be surprised if toyota even have techstream in this fucken joint. if i write my VIN over, that should just leave me with 2 ecus on the same VIN yes? jsut one communicating on kline and one on CAN bus?

 

worst part is its 22:15 pm here. i been waiting like 3 hours for your blokes to wake up and log on hahaah

 

You have both ECUs wired in the car?
If that is the case you may need to unsolder the immo chip from the tacoma ecu. It needs a response from the security module to not kill the engine. It's probably not getting any response, so it kills the engine.


If you need help locating the immo chip, I can help with that

 

Truck will run 100% with the wrong VIN programmed.

 

no only one is wired at at time. just swapping plugs. any deets on what chip needs to come out?

 

open the ECU and take a high res pic of the board I'll point it out.

Another thing I would look at too, just for sanity sake, is the MAF. same symptoms occur with maf unplugged. I know it's unlikely, but just worth double checking.

As far as CAN / KLine. There is an interesting thing with toyota ECUs. (at least by programming sake) the CAN ecus are compatible to receive data and even flash over KLine, but the KLine ecus cannot receive CAN data in the same manner.

 

maf i know is good. scanner pics it up and reads correctly. plus its plugged in.
with the kline stuff, so it is safe to assume that the CAN tacoma ecu will interpret any kline data this hilux is sending it?
what sort of signal is the security module sending? is it something i can replicate?

opening up the box now

 

The CAN ecu can receive the data yes. Can it use it? I don't think so. I just know you can initiate write protocols on a CAN using the Kline method (flashing).

I know that the CAN and KLine ecus share so many things I'm sure there is a way. Even the microcontroller, the flash size, the data etc all identical. Same 992/1024kb(assuming 09+ecm) ROM (in this case), same exact MCU.

That was my thought when I thought you had 2 ecus wired in. If the tacoma is not getting any message back from the security module, then it will kill the engine. How it works is there is a chip on the ECU that stores a unique string of hex, The ECU verifys this hex string vs the security modules response, and will keep the engine running.

 

this sounds super feesable with the way it behaves
my understanding was that the only difference in them was what protocol used to connected to a service tool at the obd. ive since found that from 2012 onwards the audm hiluxs do have a can circuit to the obd through the traction control. doubt our ecus will be supported tho. i wonder then if i plug this into a 2012 will it run

 

Pics

 

PM sent.

before doing it I would double/triple check all other possible causes.

 

Back to larger maf housings, if anyone needs a harness extension, I just got this installed with intake. Perfect fitment with the plugs. A lot easier than soldering in extensions (at least for me)

$20 Michigan Motorsports Mass Air Flow Sensor Harness 24" Fits Denso 5 Wire pin MAF Fitment for Tacoma 4 Runner

https://www.amazon.com/Michigan-Motorsports-Sensor-Extension-Harness/dp/B01NC359BL