What Voltage are Injecors Running?

Chambers · 10-26-2007, 08:49 PM

Hi all, I'm wondering how many volts are running thru a injector while the vehicle is at idle, I'd find it out my self but its been raining for the past day and a half and its been ticking in my head for a while. Thanks.

mrnickleye · 10-27-2007, 02:16 AM

12v is what they get to them.

See page FI-88 in the TSRM

http://www.cygnusx1.net/Supra/Librar....aspx?S=FI&P=1

btwilson86 · 10-27-2007, 04:02 AM

Actually, all that gets to the injectors is between 1 and 3 (I think) volts. That's according to the Haynes Book... What I did to "test" the electrical portion of the injectors was to take a injector plug with a couple inches of it's wire off of a donor harness from the junkyard. Take your plug and strip 1/2" of insulation off the end of the two wires, and plug the plug onto an injector. Grab a good AA battery, and touch the two wires to the ends of the battery, and if it works right you will hear a faint *click* sound. If not, then the electricals of the injector don't work right. Also, if you want to make sure your getting power from the harness into the injectors, buy a red 1.5V LED with a couple inches of wire from each lead, and stick that into an injector plug on your car's wiring harness. Have a friend crank your car over, and you should see the LED flashing rapidly. It'll be faint, as the power comes and goes very rapidly, so perform that last test at night so you could see better.

And I just realized you didn't ask anything about testing injectors or the wiring harness, so if you need to or if anyone else needs to, there you go.

Chambers · 10-27-2007, 02:54 PM

Ok, I see, thanks. That will be helpfull, as for the TSRM I knew that information was there, its just it didnt give a deffinate awnser on voltage. The rain just stopped here so I can go out and check it, thanks again.

mrnickleye · 10-27-2007, 07:34 PM

Ops, me bad. I knew that on pg FI-79 the Cold Start Injector uses 12v to operate.

I thought 12v was too high, but missed the SST used for the main injectors, pg FI-88, which has a resistor in it to cut down the voltage.

10-26-2007, 08:49 PM	#1
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	What Voltage are Injecors Running? Hi all, I'm wondering how many volts are running thru a injector while the vehicle is at idle, I'd find it out my self but its been raining for the past day and a half and its been ticking in my head for a while. Thanks. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

10-27-2007, 02:16 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	12v is what they get to them. See page FI-88 in the TSRM http://www.cygnusx1.net/Supra/Librar....aspx?S=FI&P=1 __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

10-27-2007, 04:02 AM	#3
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Actually, all that gets to the injectors is between 1 and 3 (I think) volts. That's according to the Haynes Book... What I did to "test" the electrical portion of the injectors was to take a injector plug with a couple inches of it's wire off of a donor harness from the junkyard. Take your plug and strip 1/2" of insulation off the end of the two wires, and plug the plug onto an injector. Grab a good AA battery, and touch the two wires to the ends of the battery, and if it works right you will hear a faint click sound. If not, then the electricals of the injector don't work right. Also, if you want to make sure your getting power from the harness into the injectors, buy a red 1.5V LED with a couple inches of wire from each lead, and stick that into an injector plug on your car's wiring harness. Have a friend crank your car over, and you should see the LED flashing rapidly. It'll be faint, as the power comes and goes very rapidly, so perform that last test at night so you could see better. And I just realized you didn't ask anything about testing injectors or the wiring harness, so if you need to or if anyone else needs to, there you go. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

10-27-2007, 02:54 PM	#4
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Ok, I see, thanks. That will be helpfull, as for the TSRM I knew that information was there, its just it didnt give a deffinate awnser on voltage. The rain just stopped here so I can go out and check it, thanks again. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

10-27-2007, 07:34 PM	#5
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Ops, me bad. I knew that on pg FI-79 the Cold Start Injector uses 12v to operate. I thought 12v was too high, but missed the SST used for the main injectors, pg FI-88, which has a resistor in it to cut down the voltage. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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