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[Solved]2jz no start

Caritech
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9 years 1 month ago #1251 by Caritech

Replied by Caritech on topic 2jz no start

No tool. I'll have to ground the te pin. Doing the job on spare time so as I get time I do a part so forgive if I can't provide all information. Thanks for the help.

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1mouse3
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9 years 1 month ago #1252 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

so as you say there is a output on the 3 idt triggers of the ecm and not at the ignitor, so what happen if you jump wires between the two

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Caritech
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9 years 1 month ago #1253 by Caritech

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1mouse3 wrote: so as you say there is a output on the 3 idt triggers of the ecm and not at the ignitor, so what happen if you jump wires between the two

The output needs to come from the igniter to the ECM. On a crank, backprobing the ECM harness it seems to me that the transistor is coming on but the signal is no where near 0-5V. As I said test light to battery (+ve) to igt's at igniter harness fired the coils.

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1mouse3
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9 years 1 month ago - 9 years 1 month ago #1254 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

whet is the voltage if the igniter is unpluged

Last edit: 9 years 1 month ago by 1mouse3.

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9 years 1 month ago #1255 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

if no change at of the outputs, I want you to pull the cover off the ecm and locate these control fets and do tests at them.

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Caritech
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9 years 1 month ago #1256 by Caritech

Replied by Caritech on topic 2jz no start

1mouse3 wrote: whet is the voltage if the igniter is unpluged

0V with the igniter unplugged, a few mV plugged in.

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1mouse3
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9 years 1 month ago #1264 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

ok so the voltage we are seeing is feedback from the igniter and is enough to drive the first transistor. so what we are needing to do is trace down this regulator, this my guess what we would be dealing with. The emitter off the pnp is what will lead you to the output of the regulator, I would like to know if the regulator has a 12v and ground

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9 years 4 weeks ago #1337 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

ran into useful info that started by me looking at my brothers car a lexus gs300 jzs161 a sister to this toyota crown jzs171 the motor came from, this came from my scan tool giving the two choices and asking if I was using the 17 toyota connector or 16 dlc connector. Being sisters would means there similar even tho being slightly different, that made me looking into the similarities of the connect. I came up with this diagram so you can hook up a standard 16 dlc

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Caritech
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9 years 3 weeks ago #1486 by Caritech

Replied by Caritech on topic 2jz no start

Sorry for the silence guys. Finally got back to the car and made a vid of the cam and crank signals. The owner got a working igniter and we got no difference. I am getting 4.5V at the igt's KOEO and cranking (no ECM response) @ ECM with igniter plugged in now. I tried a bypass test with test light to battery (+ve)and the fuel pump came on (once).

I grounded Te1 and E1 and only got 21 (O2 sensor) but that's expected because exhaust isn't connected and O2 is unplugged.

ECM looking like the suspect guys.

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Caritech
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9 years 2 weeks ago - 9 years 2 weeks ago #1632 by Caritech

Replied by Caritech on topic 2jz no start

Yet to find a replacement ECM but I'm still looking at it as my prime suspect. I got good 5v ref, grounds are <100mV on crank, cam and crank signals are present but the ECM just isn't responding.

Last edit: 9 years 2 weeks ago by Caritech. Reason: Spelling error

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1mouse3
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9 years 1 week ago #1785 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

but internally you are not getting the 5v ref for ignition control but could be because we missed a power, that is why I gave you some info to trace it down and maybe repair the computer if there is a fault with a component. if you can find another computer that is another option

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Caritech
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9 years 1 week ago #1790 by Caritech

Replied by Caritech on topic 2jz no start

The ECM igt signal was 5v one day on the scope with the igniter plugged in and another day it showed 0v.

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1mouse3
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9 years 1 week ago #1791 by 1mouse3

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when it was 5v did it fire the coils

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Caritech
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9 years 1 week ago #1792 by Caritech

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1mouse3
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9 years 1 week ago #1794 by 1mouse3

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did you get a pulse on the single feed

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Caritech
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9 years 1 week ago #1796 by Caritech

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No pulse just flat 5v

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1mouse3
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9 years 1 week ago #1797 by 1mouse3

Replied by 1mouse3 on topic 2jz no start

I say the best test to do would be on the signal control fet for proper function in the ecm

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Caritech
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9 years 1 week ago #1799 by Caritech

Replied by Caritech on topic 2jz no start

The customer agreed to send it to be checked out but we managed to find an ECM on eBay for less that 200USD so we'll have those.

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8 years 11 months ago #2351 by Caritech

Replied by Caritech on topic 2jz no start

Update.
Guys I missed something. The new ECM was plugged in and still no spark so I decided to use my soldering gun and to create a magnetic field close to the ckp KOEO and everything woke up (coils fired, injectors pulsed and fuel pump ran). On crank only the pump ran so I took this as sign that ECM saw rpm signal. I removed the front cover and inspected the timing assembly, cleaned the mounting surface of sensor and gap looked good. I believe the sensor is weak but ecm turns on the pump.

Sensor resistance is over 2k ohms.

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Caritech
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8 years 11 months ago #2484 by Caritech

Replied by Caritech on topic [Solved]2jz no start

Finally got it started. After a lot of research and investigating I discovered the crank sensor was wired backwards. How this happened? When the engine was being put in the connector got yanked out and the wires were plugged back in (by the mechanic) causing the sensor to send a backward signal. Thanks for the help guys.

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[Solved]2jz no start

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