ems only connects while car is cranking?!? - TriStateTuners.com :: Home of Tristate Auto Enthusiast

iloveturbolag · 12-13-2008, 08:09 PM

s14 is redtop sr20det. just installed the aem ems (1601U ) and it will only connect to my laptop while the key is in the cranking position. i can make some adjustments while working offline and then send the calibrations while holding the key in place but it should stay connected while the key is in the on position.

whats going on!?!?

teh DIRT · 12-13-2008, 09:46 PM

you have a wiring issue. Does your CEL come on when the key is in the on position?

iloveturbolag · 12-13-2008, 10:37 PM

no, just the battery and brake light.

ho1ywars · 12-13-2008, 10:41 PM

what does it say when you have the key on and you try to manually connecT?

iloveturbolag · 12-13-2008, 10:50 PM

it says "querying" and in the background it flashes "ecu offline"

ho1ywars · 12-13-2008, 11:20 PM

do you have a serial port on your laptop or are you using a usb adapter

iloveturbolag · 12-14-2008, 12:26 AM

im using a usb-serial adapter. it does connect, i just have to be holding the key in the cranking position. i stay off the clutch so it doesnt crank and it will let me send calibrations and whatnot i just have to hold it while its sending.

teh DIRT · 12-14-2008, 03:27 AM

your wiring is wrong. If your cel doesn't illuminate when your key is in the on position, your ECU is not getting power at that point, and it should be.

iloveturbolag · 12-14-2008, 11:28 AM

thanks dirt, i figured it was somthing like that it just seemed real strange. ill go through and check everything with a volt meter later today and post the result

SovXietday · 12-14-2008, 02:43 PM

Wire it directly to the ignition wire off of your column. Make sure it's IGNITION and NOT ACCESSORY.

To test, ignition will read 12V when the key is in the on position, and when you turn the car on it will drop a few volts and go back to 12. If you have an Accessory, it will drop to 0V when the car is turned on.

ho1ywars · 12-14-2008, 07:21 PM

its just plug and play.. how can his wiring be wrong?

ho1ywars · 12-14-2008, 07:28 PM

Quote:

Originally Posted by teh DIRT

your wiring is wrong. If your cel doesn't illuminate when your key is in the on position, your ECU is not getting power at that point, and it should be.

if he is running an s13 sr20 in a s14 chassis there is a very high chance that the CEL light was never wired into the stock ECU. i dont recall seeing a wire coming out of my ecu to the CEL in the dash when i was doing my wiring.

I know when i turn my ignition on, my CEL doesnt come on.

edit/

just did a quick search, couldnt find a s13 sr20det fsm. i found my old swap guide, and it doesnt show any wire for the CEL coming out of the ECU.

did the SR20 run prior to you take out the e62 ecu?

iloveturbolag · 12-15-2008, 02:35 AM

yea everything runs fine with the factory ecu pluged in (daily driven

) i just want to get my aem ems in and working, it just cranks and cranks and doesnt sound like its trying to start. but i cant begin to tune/fix anything if my laptop will only connect while it is in the cranking position. im testing every pin on the ecu harness for voltage and whatnot with the key on and while in the crank pos.

Vince@R/TTuning · 12-15-2008, 10:56 AM

The SR ECU's have 2 12v ignition feeds, but only need 1 to work. But some of the aftermarket PnP systems need both to power up the computer. I have run into this several times with Power Fc... Not sure if AEM is the same but check the wiring diagrams

iloveturbolag · 12-23-2008, 01:33 AM

i checked the wiring many times with 3 different wiring diagrams and everything seems ok... i still cant get the ems to connect to my computer unless the key is in cranking pos. this is driving me crazy!!!
if anyone has any idea's please help me!!!

SleepingGiant · 06-30-2016, 09:58 PM

Did you ever figure this issue out on what caused it. I can only get my ecu to connect when I'm cranking. Aem series 2. Main relay and ignition relay click on only while key is in cranking pisition. Please help.

SleepingGiant · 06-30-2016, 09:59 PM

Quote:

Originally Posted by iloveturbolag

i checked the wiring many times with 3 different wiring diagrams and everything seems ok... i still cant get the ems to connect to my computer unless the key is in cranking pos. this is driving me crazy!!!
if anyone has any idea's please help me!!!

need help

12-13-2008, 08:09 PM	#1
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	ems only connects while car is cranking?!? s14 is redtop sr20det. just installed the aem ems (1601U ) and it will only connect to my laptop while the key is in the cranking position. i can make some adjustments while working offline and then send the calibrations while holding the key in place but it should stay connected while the key is in the on position. whats going on!?!?

12-15-2008, 10:56 AM	#14
Vince@R/TTuning Vendor Join Date: Mar 2007 Location: telford Pa Member #3958 My Ride: the one in the back of the shop iTrader: (2)	The SR ECU's have 2 12v ignition feeds, but only need 1 to work. But some of the aftermarket PnP systems need both to power up the computer. I have run into this several times with Power Fc... Not sure if AEM is the same but check the wiring diagrams __________________ Philadelphia Area's Only Authorized and Factory Trained Pro Tuners for:HONDATA:UPREV:APEXI POWER FC:AEM:COBB:ECUTEK To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

06-30-2016, 09:58 PM	#16
SleepingGiant Noob-Jersey Join Date: Jun 2016 Member #27277 My Ride: 97 civic Ek iTrader: (0)	Help same issue Did you ever figure this issue out on what caused it. I can only get my ecu to connect when I'm cranking. Aem series 2. Main relay and ignition relay click on only while key is in cranking pisition. Please help.

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12-13-2008, 10:37 PM	#3
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	no, just the battery and brake light.

12-13-2008, 10:41 PM	#4
ho1ywars Tri-State Addict Join Date: Mar 2005 Location: Ewing, New Jersey Member #282 My Ride: S14, EF, 600RR iTrader: (2)	what does it say when you have the key on and you try to manually connecT?

12-13-2008, 10:50 PM	#5
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	it says "querying" and in the background it flashes "ecu offline"

12-13-2008, 11:20 PM	#6
ho1ywars Tri-State Addict Join Date: Mar 2005 Location: Ewing, New Jersey Member #282 My Ride: S14, EF, 600RR iTrader: (2)	do you have a serial port on your laptop or are you using a usb adapter

12-14-2008, 12:26 AM	#7
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	im using a usb-serial adapter. it does connect, i just have to be holding the key in the cranking position. i stay off the clutch so it doesnt crank and it will let me send calibrations and whatnot i just have to hold it while its sending.

12-14-2008, 11:28 AM	#9
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	thanks dirt, i figured it was somthing like that it just seemed real strange. ill go through and check everything with a volt meter later today and post the result

12-14-2008, 07:21 PM	#11
ho1ywars Tri-State Addict Join Date: Mar 2005 Location: Ewing, New Jersey Member #282 My Ride: S14, EF, 600RR iTrader: (2)	its just plug and play.. how can his wiring be wrong?

12-15-2008, 02:35 AM	#13
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	yea everything runs fine with the factory ecu pluged in (daily driven ) i just want to get my aem ems in and working, it just cranks and cranks and doesnt sound like its trying to start. but i cant begin to tune/fix anything if my laptop will only connect while it is in the cranking position. im testing every pin on the ecu harness for voltage and whatnot with the key on and while in the crank pos.

12-23-2008, 01:33 AM	#15
iloveturbolag Tri-State Aficionado Join Date: Sep 2008 Location: Morgantown Wv Member #8772 My Ride: S14 iTrader: (0)	i checked the wiring many times with 3 different wiring diagrams and everything seems ok... i still cant get the ems to connect to my computer unless the key is in cranking pos. this is driving me crazy!!! if anyone has any idea's please help me!!!