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#1
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intake air temp signal to the ECU
I've read somewhere that you may connect a resistor in series with the intake air temperature sensor to make the ECU believe that the air temp is higher and get the ECU to inject more gas. Is this true? Where can I find instruction on it?
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#3
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Re: intake air temp signal to the ECU
The first problem you will encounter is finding the IAT sensor.
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#4
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Re: intake air temp signal to the ECU
the thing is:
1.- my CEL goes on only when the car was running for 2 or 3 min. 2.- I've remove the two first catalizers 3.- when I'm traveling at a steady speed of 60 or 80km/h, if I slightly press the gas pedal I can feel some acceleration change, but if I press it more, there's no change on the acceleration. in fact, I feel like if the car was going to decrease acceleration. In your experience... what could possibly being happening in my car? |
#5
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Re: intake air temp signal to the ECU
Speak for yourself.
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Disclaimer: The above post is on the internet. |
#6
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Re: intake air temp signal to the ECU
Quote:
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Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#7
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Re: intake air temp signal to the ECU
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May be you can recomend me one cool cable and software I can use to connect my lapto to the ECU and get to know why the CEL turns on most of the time. I've connect a vacuum gauge to monitor vacuum while driving... I found (as we all know) that the aceleration stops when vacuum reaches zero. With this engine in particular, zero vacuum is reached so fast. I suspect the car is running lean and with late ignition timing. IŽll connect my DMM and monitor injectorŽs duty cycle to confirm this. do you know any way to change the ignition timing in this engine? |
#8
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Re: intake air temp signal to the ECU
There is a bunch of info on this in the how to section, under "trouble codes".
Here are 2 good ones: Check Engine Code Location with pics: http://www.subaru-svx.net/forum/showthread.php?t=54037 How to Check Engine codes: http://www.subaru-svx.net/forum/showthread.php?t=54033 Hope that helps. Basically you just put the wires it shows you where it tells you and count how many times the CEL blinks. That tells you the code, then you check it against the code sheet. At least that is how it works on my 92... |
#9
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Re: intake air temp signal to the ECU
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Your engine is probably running retarded because the ECU has gone into limp mode due to the CEL. Fix the problem that's causing the CEL first before you mess with anything else.
__________________
Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#10
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Re: intake air temp signal to the ECU
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My SVX is a '94. Should I ground any wire in the blue diagnostic connector to see the CEL blinking. very good recommendation: checking the CEL first. It is exactly what I thought at the begining. If you could just help me with instructions on how to get the code... |
#11
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Re: intake air temp signal to the ECU
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__________________
Subaru ECU and TCU Website 1992 Alcyone SVX Version L 1992 Alcyone SVX Version L 1994 Alcyone SVX S40-II 2004 Subaru Legacy 2.5 SE Sports Tourer 1996 Subaru Legacy 2.2 GX Wagon 1988 Subaru Justy J12 SL-II |
#12
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Re: intake air temp signal to the ECU
Excelent! thank you guys!
I just bougth this car two months ago and use it only weekends because on week days I fix something on it when I come back from work... I did remove the cover under the wheel and I could not find any connector.... May this comnectors be on the side wall? near the fuses box? |
#13
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Re: intake air temp signal to the ECU
Inside the car man. To the left of where your left foot sits when you're sitting inside it, there is a carpeted kick panel. It's held on by clips and pops off to reveal the interior fuse box and a mass of wires where you'll find the diagnostic plug. Make 100000% sure you know you've got the right plug before you go cutting any wires.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#14
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Re: intake air temp signal to the ECU
This is the 20-pin diagnostic plug. The smaller black one is the one that you use to check ECU codes.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#15
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Re: intake air temp signal to the ECU
Thank you icingdeath88. that is good!
So, I should insert one of the blue wires on one of the black pins depending on what I want to test, isn't it? after that I should see the CEL or the POWER ligth to read the code why my CEL is on... The other way is to to get the USB cable and a software and connect it on the blue connector? does this software read codes and turn off the CEL? Thanks again bro. |
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