No voltage from pins IGT 1-6 at ecu
10-07-10, 10:49 AM
#16
That's a good question. I would assume that if the OFF state of IGT is Ground, then there should be continuity between IGT and ground with the key on engine off. I didn't want to suggest probing for continuity though, because I don't know how sensitive the ECU would be to that.
10-07-10, 11:28 AM
#17
maybe i dont understand but why would you think there is something with IGT 1-6 and IGF when you have spark but no fuel... if you have spark then its clearly working. If IGF wasn't getting the proper confirmation signal at the ecu the ecu would shut the engine down and you wouldn't have any more spark. but you said you have spark so its working.
Start looking at injector related outputs.
Start looking at injector related outputs.
Last edited by Ali SC3; 10-07-10 at 11:31 AM.
10-07-10, 01:10 PM
#19
i may have jumped the gun on that one, looks like it shuts it down by cutting off the injectors, I though it shut everything down but looks like it doesn't. If your fuel isn't working how did you verify the spark, while cranking?
http://www.autoshop101.com/forms/h39.pdf
bottom of page 6.
http://www.autoshop101.com/forms/h39.pdf
bottom of page 6.
10-07-10, 02:06 PM
#23
the reason i thought there was something wrong with IGT signals is because according the toyota service manuals for the OBD1 2jzgte's those pins are supposed to be 12v key on in the "standard value of ecm terminals" page
now i find this in the 94 TSRM, so i guess only god knows what its suppoed to be
as far as i can tell everything is wired the way its supposed to be, ive been tracing wires and looking at voltages for literally almost 2 weeks. Im really starting to move my bet on the ECU
now i find this in the 94 TSRM, so i guess only god knows what its suppoed to be
as far as i can tell everything is wired the way its supposed to be, ive been tracing wires and looking at voltages for literally almost 2 weeks. Im really starting to move my bet on the ECU
Last edited by 93MSB; 10-07-10 at 02:10 PM.
10-07-10, 02:13 PM
#24
Hey, if its sparking, I would move on to other stuff lol. You don't have an o-scope do you? I would look for the IGF pulse and once verified, move to injector pulse. But, if the fuel pump is running, the injectors should fire... Unless the 12v mod is overriding the IGF kill. Does the fuel pump run without the 12v mod?
10-07-10, 02:22 PM
#25
the way it was worded I thought he may have wired both wires to the same 12v, in which case nothing would happen ever.
yes, normally one is constant 12V and the other pin goes to the respective ecu injector output which grounds that pin to fire the injector.
I guess if we assume the ecu isn't outputting anything to the injectors and they are wired properly, then the problem lies in the ecu, ignitor, or cam/crank sensors.
check out page 8 it has a useful chart
http://www.autoshop101.com/forms/h25.pdf
Its probably not IGT 1-6 if the ignitor/coils are making spark.
Since you have spark the chart indicates its an IGF problem, so I guess you guys were on the right track, but if you did a continuity test and swapped out ignitors already, theres not much else I can think of unless you have IGF wired to the wrong spot on the ecu, or the ecu isn't operating correctly for some reason. make sure the ecu grounds are good.
yes, normally one is constant 12V and the other pin goes to the respective ecu injector output which grounds that pin to fire the injector.
I guess if we assume the ecu isn't outputting anything to the injectors and they are wired properly, then the problem lies in the ecu, ignitor, or cam/crank sensors.
check out page 8 it has a useful chart
http://www.autoshop101.com/forms/h25.pdf
Its probably not IGT 1-6 if the ignitor/coils are making spark.
Since you have spark the chart indicates its an IGF problem, so I guess you guys were on the right track, but if you did a continuity test and swapped out ignitors already, theres not much else I can think of unless you have IGF wired to the wrong spot on the ecu, or the ecu isn't operating correctly for some reason. make sure the ecu grounds are good.
Last edited by Ali SC3; 10-07-10 at 02:27 PM.
10-07-10, 02:44 PM
#26
oh man i just had a thought that might help actually. how did you test the spark and did you check all 6 coils? If one or more of the coils doesn't fire it won't produce the IGF signal for that coil and the ecu would cut the injectors out. you would not notice this on a multimeter cause its not sensitive enough for you to see 1 event missing out of the 6 each revolution.
thats why i like my aem ems, it doesnt even need an IGF signal at all.
also check tps wiring, a tps indicating 100% throttle will tell the ecu you are trying to clear a flooded engine and will not activate the fuel injectors during cranking until the tps comes back down.
thats why i like my aem ems, it doesnt even need an IGF signal at all.
also check tps wiring, a tps indicating 100% throttle will tell the ecu you are trying to clear a flooded engine and will not activate the fuel injectors during cranking until the tps comes back down.
Last edited by Ali SC3; 10-07-10 at 02:47 PM.
10-07-10, 05:06 PM
#29
ok all the plugs are firing when the car is cranked.
i pulled the TPS off and set it according to the 93-95 TSRM for the 2JZGTE
a funny thing ive noticed is the oil level light doesnt come on until the car is cranking, and goes off when the cranking stops. Also the guage cluster backlights (speedo/tach/fuel level/coolant temp) are on when the ignition is turned to "on" but when the car is cranked the backlights turn off completely. Only the warning lights stay on. Is this normal operation?
i pulled the TPS off and set it according to the 93-95 TSRM for the 2JZGTE
a funny thing ive noticed is the oil level light doesnt come on until the car is cranking, and goes off when the cranking stops. Also the guage cluster backlights (speedo/tach/fuel level/coolant temp) are on when the ignition is turned to "on" but when the car is cranked the backlights turn off completely. Only the warning lights stay on. Is this normal operation?
