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Old 01-17-2004, 05:55 PM   #1
smacksube
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Question Here's the FINAL WIRING question on EJ20G

ok....i'll lay out EXACTLY all the wiring i've done, maytbe then someone can tell me why i see only 1.6 volts at the ECU for all 4 fuel injectors.

All these sensors are wired into their repective ECU pinouts. Grounds from all the sensors are grounded into the pressure sensor ground wire via the wiring schematics.

all pressure sensors, o2 sensor, MAF, TPS, IAC, Ignitor Pack, Cam angle, Crank angle, CLT, knoick sensor, all 4 fuel injectors

the injectors are being grounded by the injector ground wire running to the ecu.

when the ignition is on and the ignition wire to the ECU is at 12v, the ignitor pack is reading 12 v on all wires, the MAP is getting power, all sensors that get power at that time are powered. the 4 injectors are at 1.6 volts.

the ECU is grounded using all ground wires to a battery ground, not a chassis ground. i tried the chassis, but it wouldn't power up.

THe codes being flashed are 14 - 17, the 4 fuel injkector codes.

help? what the hell is missing from this? Oh yah, the injectors are supposed to be getting 12 v power, not 1.6.

thanks,

eric
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Last edited by smacksube; 01-17-2004 at 06:02 PM.
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Old 01-17-2004, 07:46 PM   #2
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If anyone has any information or can help please do so. Your posts are really needed. I am willing to write the person that can give the answer that solves the problem a check for an un-disclosed amount. If you have any questions you can email me at minigun828@yahoo.com
I really appriciate the effort and input from you guys and I hope we can get to the bottom of this. We are 1 problem away from completion...
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Old 01-17-2004, 08:56 PM   #3
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Quote:
Oh yah, the injectors are supposed to be getting 12 v power, not 1.6.
yes
after playing with a simmilar (kida) proublem on a frineds car last week the +12v to the injectors does not have to be switched it can be constant .. try another 12V source.. at least to get the car initialy fired..

is the 1.6V the reading befor or after the injector?
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Old 01-17-2004, 09:56 PM   #4
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Did you check the power voltage at the air control vavle and purge valve. They should be on the same circuit as the 12volt supply for the injectors.
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Old 01-18-2004, 11:19 AM   #5
smacksube
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Quote:
Originally posted by Jaxx
yes
after playing with a simmilar (kida) proublem on a frineds car last week the +12v to the injectors does not have to be switched it can be constant .. try another 12V source.. at least to get the car initialy fired..

is the 1.6V the reading befor or after the injector?
so as long as the injectors are grounded through the EVU injector grounds, i can use any external 12v constant power source? sweeet, i'll post up soon whether this works or not..thanks!
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Old 01-18-2004, 11:20 AM   #6
smacksube
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Quote:
Originally posted by Ver.III
Did you check the power voltage at the air control vavle and purge valve. They should be on the same circuit as the 12volt supply for the injectors.
The IAC was another code i was throwing, after volt checking the wires i wiried it up to 12v and the code went away, maybe this is where it's all going wrong....thanks alot for the input guys!
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Old 01-18-2004, 07:16 PM   #7
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TY guys, Smack is gonna try to get it workin off of what you guys said and we will take it from there. I really appriciate the input, if anyone else has any info, let us know.

THANKS GUYS......
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Old 01-19-2004, 01:37 PM   #8
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Old 01-19-2004, 07:13 PM   #9
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ok...so now i'm a little confused. The ecu has 2 wires going out for injector grounds. later in the harness the come together and lead out as 1 big wire. so this means the injectors are constantly grounded and open when any of the wires from the ecu see 12v. right so far? so if all grounds are correct then why would i only get 1.6v at the ecu and not 12v? is my thinking correct? or is this computer possibly messed up?

if i attach a constant 12v to the injectors then all of them will be opening at the same time, eh? the car def. won't be able to drive like this. It may start momentarily but there's gotta be a better approach. The last thing needed is a catastrophic failure due to detonation or pre-ignition or something lame like that.
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Old 01-19-2004, 10:01 PM   #10
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Old 01-19-2004, 10:16 PM   #11
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Injector should have 12volts which if you look at the injector wires , one wire will be common color for all four (ie. yellow/blue) This will be the 12 volt supply. The second wire on each injector will be the signal wire which each wire on each injector has a different color. These wires go to the ecu, normally bunched together on one connector. The ecu has injector drivers internally , which will ground out the signal wire causing the injector to pulse(open) If you are measuring the signal wire with the connector still plugged into the ecu , you should still see the 12volts when the ignition is on. If you disable the ignition and crank the car , the voltage should fluctuate. If you have a high impedience test light , it will be easier to see.
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Old 01-19-2004, 11:32 PM   #12
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ok i'll try that. i was hooking up the injectors to the drivers and then grounding them out through the ecu pinouts labeled 'injector grounds'. i'll try swapping the 'grounds with the constant 12v and hooking up the other wires to the ecu.
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Old 01-20-2004, 02:09 AM   #13
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Quote:
Originally posted by smacksube
ok i was hooking up the injectors to the drivers and then grounding them out through the ecu pinouts labeled 'injector grounds'.



NO , the pinout that says injector grounds DOES NOT mean that you ground the injectors to that wire. The wires that come from the ecu that says injector grounds GOES to the ground on the car or negative terminal of the battery. On your ecu pinout sheet, the pins that say injector 1 , injector 2 , injector 3 , injector 4 . means the other wire that comes off each injector(not the 12volt supply) goes to those pins accordingly.
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Old 01-20-2004, 04:56 AM   #14
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oooooooh....so that's the big freaking misunderstanding. so many people were telling me to ground to the ecu, not the engine and that the 12v power comes from the ecu not a constant. now i think this project can finally be freaking completed!!!! thankyou much
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Old 01-20-2004, 11:49 AM   #15
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YAY! Hopefully it works. If not we will be right back here on the boards
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Old 01-20-2004, 12:44 PM   #16
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Quote:
Originally posted by smacksube
12v power comes from the ecu not a constant.

12volts does not really come directly from the ecu . Power for everthing should come from the main relay , the brown one with a brown connector that is usually paired with the fuel pump relay which is the round silver with the green connector. There should be 2 wires of the main relay which are power when ignition is turned on. Everything means injector power , ecu power , air control valve , purge valve , boost control valve , pressure sources valve....etc.
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Old 01-20-2004, 04:12 PM   #17
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LOL, I hope Eric gets it right and my car doesnt blow up. TY again guys for the help, I got a good feeling this time.
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Old 01-20-2004, 04:29 PM   #18
smacksube
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ok...last question. what code is being flashed with 5 short flashes? i couldn't find it on any manuals i've d/l'd. they all start at code 11.
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Old 01-20-2004, 04:44 PM   #19
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5 short blinks eh

Last edited by smacksube; 01-20-2004 at 05:42 PM.
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Old 01-20-2004, 07:10 PM   #20
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you know Ver3? You seem to know everything bout this stuff

Anyone?
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Old 01-20-2004, 07:11 PM   #21
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hahaha...it matters not now...the beast has roared to life!
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Old 01-20-2004, 08:24 PM   #22
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w00t
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Old 01-21-2004, 09:01 PM   #23
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