Jeffs_Emporium Posted February 11, 2020 Share Posted February 11, 2020 I cant seem to get this to spark from the main lead going from coil to igniter. Ive now used the correct igniter and took the cover off it to identify pins. I'm fairly certain I have wired the ecu correctly and have used the engine manual to check voltages across certain pins. The igniter is triggered by the ecu via IGT pin and also has IGF. I seem to have a constant 12v on the IGT when the ecu is on, I would have thought it would be a pulsing 12v as the engine cranks? Quote Link to comment Share on other sites More sharing options...
Italia Posted February 11, 2020 Share Posted February 11, 2020 Toyota IGT is typically a 5V signal, 0v 5V transition begins charging the coil then spark occurs when it transitions from 5v to 0v. I am not 100% sure the IGT on the 1gge ecu is 5v, but if it is 5V, it would almost be impossible that if that IGT output had failed it would default to 12v. Is there another 5V output pin on the ecu you can test to confirm its 5V out? Have you attached all the grounds to the ecu? There may be a pull down resistor that's floating at 12v if the ground isn't connected, but seems unlikely. Have you double checked you have the right pin for IGT and confirmed the pinout you are using is the correct one for your ecu? Are you able to post up the pinout/wiring diagrams you do have? Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 11, 2020 Author Share Posted February 11, 2020 I have taken the lid off the ecu to identify the pins. I did remember that IGT for 2jzge was 5v as you mention. I'm fairly certain all ecu ground are attached how ever I do not have the pin out for the body plug on the engine loom. Quote Link to comment Share on other sites More sharing options...
kpr Posted February 11, 2020 Share Posted February 11, 2020 i assume you have the igniter case grounded? if its a ali cased toyota ignitor case needs to be grounded 1 Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 11, 2020 Author Share Posted February 11, 2020 Yeah igniter has ground pin inside to igniter body which is screwed to a steel clip which clamps around coil to body Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 11, 2020 Author Share Posted February 11, 2020 This is a print out of pinout of gen 1 1gge with afm. I have written what my gen 2 map sensor engine pins are below in pen. Ones I'm unsure of are PIM, VCC, Quote Link to comment Share on other sites More sharing options...
Italia Posted February 11, 2020 Share Posted February 11, 2020 Are the injectors firing? If they are then it means the ecu is getting the trigger signals from the distributer. I saw one wiring diagram where IGF has a pull up to 5V, are you able to measure what the voltage is at IGF, with nothing else connected to that input on the ecu? PIM is the map sensor, and VCC is 5v. Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 11, 2020 Author Share Posted February 11, 2020 I have the IGF and IGT connected to igniter via a two pin plug. If I connect these with the key switched to ON a large spark emits from the coil, does this confirm igniter/coil is functioning as it should and I should look at the lead from coil to dizzy? Injectors dont seem to be firing Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 12, 2020 Share Posted February 12, 2020 got a good earth from the engine to the body/battery earth Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 12, 2020 Share Posted February 12, 2020 also confirm everything is still getting power while cranking, and its not wired to a circuit that cuts off during crank over ect Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 12, 2020 Author Share Posted February 12, 2020 Yeah have a good earth from battery to block and body and on rear of head as per factory. And checked IGSW, +B, +B1 is receiving power during start and crank. I did have MREL hooked up to 12v feed also but have rectified that. Stripping back the engine loom from ecu as far as I can to identify what all the pins on engine harness to body loom plug are. Do injectors have a constant 12v then the ECU feeds a ground to operate them? Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 12, 2020 Share Posted February 12, 2020 i dont think they are meant to, but dont quote me on that. reason i say that is, on my megasquirted car, i wired the injectors to constant 12v, and then discovered that when the ecu shut off it pulled down to negative, and i was jamming my injectors on and dumping the fuel rail into the cylinders. i probably need to get those injectors checked... but that may not be how the toyota is wired. if you get stuck i can drag the crown out tomorow and poke around it, but its 1ggze. probably the same? Quote Link to comment Share on other sites More sharing options...
kpr Posted February 12, 2020 Share Posted February 12, 2020 injector, coil, ecu etc.. 12v+ should only be on with key on. ecu supplies ground to switch injectors if injectors aren't working and no spark. check the 12v+ supply is good. if so its likely that the ecu isn't seeing the cas triggers. neither will do anything if ecu cant see rpm 2 Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 12, 2020 Author Share Posted February 12, 2020 Will unplug injector resistor and start injector time switch and try again Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 12, 2020 Share Posted February 12, 2020 thats just preventing the engine starting while you check for spark? im with KPR it sounds like the ecu isnt seeing RPMs Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 12, 2020 Author Share Posted February 12, 2020 After deleting the auto shit I've lost about 10 pins from body plugs. NSW I hook directly to earth? -IDL branches into body plug, what should this be connected to? -#10 branches into another pin on body plug, what should this be connected to? -Power to iscv is also on body plug ( 12v key ON?) Quote Link to comment Share on other sites More sharing options...
Jeffs_Emporium Posted February 15, 2020 Author Share Posted February 15, 2020 Have found a few peices which were wrong. Although I hooked up e²² and e¹¹ to the original engine body to ecu e¹¹ this pin must have connected to ground via AFM or something as it was not earthed. N/sw is connected to ign on (is a manual ecu anyway) Iscv and injector resistor power are hooked up to ign on also. STA is connected to CRANK via starter motor switch Still not getting spark. When I connect a multi meter to IGF and IGT with key ON I'm reading +12v? Diagnostics code is coming back as no ignition signal also Is there someone in Central Auckland I can pay money for a house visit to help find the issue? Quote Link to comment Share on other sites More sharing options...
Spencer Posted February 15, 2020 Share Posted February 15, 2020 How have you got the MREL setup? I thought usually ISCV and other stuff is powered by the main relay which is ECU switched? Usually still starts if that is done wrong though. Sorry not much help, maybe try getting a scope to check what’s actually happening? They are pretty cheap now. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted February 23, 2020 Share Posted February 23, 2020 how confident are you that the ecu isnt fried? Quote Link to comment Share on other sites More sharing options...
bigmatt4 Posted February 24, 2020 Share Posted February 24, 2020 i normally remove the dizzy and spin it with a drill instaed of cranking the engine then you can hear the injectors ticking if they are not i would suspect the distributor to be a fault . also check for a 5 volt feed from a sensor to make sure the ecu is actually powering up Quote Link to comment Share on other sites More sharing options...
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