93MSB

iTrader: (8)

recently swapped a 92 soarer jzz30 automatic 1jzgte into a 95 sc300, and i cant get any fuel into the cylinder.

all of my ecu terminal values are correct except for pins IGT 1-6

pins IGT 1-6 have no voltage at the ecu with key on

i tested continuity of the wires between the ignitor and the ECU. no shorts were detected

IGF shows 5v with key on

if you go through the diagnostic troubleshooting procedure in the toyota service manual it says to replace the ignitor with the symptoms ive listed above. However, i just replaced the ignitor with a brand new one and i still have no signal to/from IGT 1-6

the repair manual suggests the ECU could be bad. Before i replace the ecu though i want to see if anyone has any suggestions to why im not getting any voltage at pins IGT 1-6

stockhatch

iTrader: (12)

Im looking in the 2JZ diagnostics manual and it calls for -.1 -.05 with key on for IGT1-6. IGF should be 4.5 to 5.5v. Are the 1JZ and 2JZ that much different?...

stockhatch

iTrader: (12)

Oh, and are you sure IGT(ignition) signals would effect fuel injection?

93MSB

iTrader: (8)

this is what i have from the 1995 supra toyota service manual



im not 100% sure the igt affects the fuel or not, but i think i have a bad ECU which could very well mess with the injectors

StiCk3

iTrader: (5)

are you getting signals from the crank and cam sensors? any codes from the ecu?

stockhatch

iTrader: (12)

I'm not saying either is right or wrong, but here is what I am reading from the 97 diagnostics manual on Stu Hagens site. It seems to me that you should get around 0 volts when the coil is not firing because the coil is fed hot and the ECU sends the igniter a signal that grounds it to fire it right? Im not sure on the exact operation obviously.

stockhatch

iTrader: (12)

Have you pulled a coil and done a spark test to verify you have no spark?

93MSB

iTrader: (8)

it has spark

stockhatch

iTrader: (12)

Do the injectors have 12v? Is the fuel pump running at all/is there fuel pressure? I'm sure you have covered these issues, I just wonder if you have narrowed it down to no injector pulse signal from the ECU.

93MSB

iTrader: (8)

yes the injectors have 12v on both sides IIRC. I have the fuel pump hotwired via 12v mod, i can hear gas rushing through the rail with key on.

i just checked all the cam/crank sensors. all showed proper resistance and no shorts in the harness

93MSB

iTrader: (8)

also, you are correct the 97 2jz calls for -.1 - .5

however, thats definitly a OBDII computer for a 97 2jz. This 1jz was manufactured late 91/early 92 so it has to be OBDI. I also get absolutely NOTHING from any of the IGT terminals, so even if it was supposed to be what the 97 is calling for im not getting that either

stockhatch

iTrader: (12)

Good point on the OBD thing. Even so, OBDI and II should be pretty much the same, since the OBDII ECU is plug and play in an OBDI car is it not?

So you are getting an open reading on the ECU pins then? Interesting. Since the 1jz ECU is famous for failed caps, I guess you could open it up and visually inspect them for leakage.

Sorry I am not more help.

93MSB

iTrader: (8)

im not sure if they are a direct swap, i wouldnt think so since at the very least the O2 sensors are 1wire(obd1) and 4wire(obd2)

when i probe the ecu at pins IGT1-6 > E1 there is no fluctuation in voltage whatsoever.

i have taken the ecu apart to look at the PCB and the caps, i didnt see anything burned or any caps leaking

stockhatch

iTrader: (12)

Have you measured IGT voltages when cranking, or just with the key on? The TSRM says that during cranking, you should get >.1v but <4.5v.

I also did read that if you don't get an IGF signal, the ECU cuts injection, so as you suspected, there is a direct relation between proper spark control and the fuel injectors.

93MSB

iTrader: (8)

i just went and checked while cranking, again there was no fluctuation in voltage. Should the igt>e1 show resistance when the key is on?

i do have an IGF signal though