1J Microtech issue

[Jzxbenno]

Hello everybody

well im having a very annoying problem actually two with my microtech and i wanna see if i can sus it before i drive to the tuner firstly sometimes i start the car it has no errors every now and again when i start the car I get a RPM and REF error its driving me crazy, nextly its a bit weird the car wont start as your cranking it but as soon as you stop cranking it kicks to life very weird any help muchly appreciated

Ben

[ryguy86]

Hello everybody

well im having a very annoying problem actually two with my microtech and i wanna see if i can sus it before i drive to the tuner firstly sometimes i start the car it has no errors every now and again when i start the car I get a RPM and REF error its driving me crazy, nextly its a bit weird the car wont start as your cranking it but as soon as you stop cranking it kicks to life very weird any help muchly appreciated

Ben

are you runnig a x6 box? or standard ingitor and coils?

[Jzxbenno]

x6 box yew yew

[ryguy86]

x6 box yew yew

this might sound silly to you..

but with your coils.. how are they powered?? just direct power from the ingition and a signal from the x6box?


if so.. i would suggest buying 3x mini 30 amp relays - the ones with 2 aux outputs...
then power your coils off these.. it will give you a more regulated power from the battery. power the 3 relays by a 30 amp power from battery with a 30 amp fuse in line.

i had problems with miss-fire and RPM spikes etc until i did this.

so what you should do is this.

on the relay.. you'd have...

30 - power
85 - +ve from battery
86- earthed

and the aux outputs should power 2 coils each.

[Jzxbenno]

there powered x6 signal and direct from ign as you say
hmmm might give that a shot ill just putt it down the tuners and let him sort it

[ryguy86]

there powered x6 signal and direct from ign as you say
hmmm might give that a shot ill just putt it down the tuners and let him sort it

yeah you might as well do it..

it means that the power flow to the coils is constant power and really good.

also make sure your earthing is nice and sweet.


are you running an air temp sensor??

[Cuzzo]

I have the best solution for you!!!!

The exact thing happened to me with the error codes!!

IF you get the car to start fine without needing alot of cranks the error will disappear after you reset the ecu's power. The errors only come up when you have trouble cranking her over. (or apart from the obvious that the wiring has issues)

Get it to crank fine everytime..

[ONETEN]

Frankly im not suprised your getting rpm and ref errors, the trigger systems on 1j and 2j's are one of the worst and hardest to setup ive ever seen - biggest bastards.
The problem with the toyota reluctor sensors is that during cranking the starter motor produces alot of electrical interference, which the affects the signal inputs on the computer as the signals from the triggers are fairly weak. I wouldnt worry to much about errors on cranking, i did a wolf on a 1jz and pretty much had an error count every time.

-Hayden

[Cuzzo]

Frankly im not suprised your getting rpm and ref errors, the trigger systems on 1j and 2j's are one of the worst and hardest to setup ive ever seen - biggest bastards.
The problem with the toyota reluctor sensors is that during cranking the starter motor produces alot of electrical interference, which the affects the signal inputs on the computer as the signals from the triggers are fairly weak. I wouldnt worry to much about errors on cranking, i did a wolf on a 1jz and pretty much had an error count every time.

-Hayden

Aslong as everything is working fine. Which there is a good chance they are considering its running fine just hard starting. The codes are only because its hard to start. This happened on my 4agze when the coils were plugged in wrong. Fixed that up and code disappeared.

[chris davey]

I found that the MT seemed to cope with the low signal strength on cranking a lot better than my wolf 3d did with a signal conditioning box.

I didn't need any additional relays but I have a direct wire from battery with some size fuse as power for coils.

Mine starts basically instantly.

[Vios-GT_07]

this might sound silly to you..

but with your coils.. how are they powered?? just direct power from the ingition and a signal from the x6box?


if so.. i would suggest buying 3x mini 30 amp relays - the ones with 2 aux outputs...
then power your coils off these.. it will give you a more regulated power from the battery. power the 3 relays by a 30 amp power from battery with a 30 amp fuse in line.

i had problems with miss-fire and RPM spikes etc until i did this.

so what you should do is this.

on the relay.. you'd have...

30 - power
85 - +ve from battery
86- earthed

and the aux outputs should power 2 coils each.

this is a solution i'm looking at for my blapper (13B rotary) exactly same problem, erratic ignition signal which the ECU inteprets as 7000 rpms, Shift gear!! while the engine is cranking, hence the flood .

2 questions

1. can you provide a diagram of sorts or detail as to where all the 5 pins go? i have 2 coils.. and i think the ECU picks up the signal straight off the coil.. 30 - power = does this go to coil? shouldn't there be two?

2. can i set the microtech to use throttle position as a function of fuel as well? skimming through the manual doesn't indicate any reference to throttle position but as it's fuel only, concentrates on revs and loading..

sorry for the thread hi-jack but i find it was relevant and doesn't justify another thread (rotary is a disease and sacrilege on toyota forum)

[YLD-16L]

When you buy a relay Vios the circuit diagram is on the packaging and on the relay in most cases.

87 and 87 on a non-changeover 5 pin relay would be the ones going to the coils.

[chris davey]

Microtech can be tuned with either TPS or load. If you have a turbo engine obviously load is a better idea. For ported rotar's and cars with ITB's they quite often use TPS because of low vacuum at idle.

If you use load, then the only thing the TPS is used for is to let it know to drop back to the idle map when it gets to zero.

[Kyosho]

Microtech can be tuned with either TPS or load. If you have a turbo engine obviously load is a better idea. For ported rotar's and cars with ITB's they quite often use TPS because of low vacuum at idle.

If you use load, then the only thing the TPS is used for is to let it know to drop back to the idle map when it gets to zero.

And for ITB the BEST way to do it is a cross MAP and TPS...

[Jzxbenno]

All of you champs cheers heaps for the help sussed it out sorta got it cranking less the error codes stop