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Old 09-23-2003, 10:21 PM   #1
Homemade WRX
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Default Help with speed sensor on engine EJ20 swap

Hi, I have "finished" my swap for the most part. I've been driving it for about a month now and still can't figure out my speed sensor doesn't relay to the ECU. I know it's not because I'm stuck in "safe mode"
this limits me to a 4200 rpm redline and then the car goes into convulsions
Please help me out, Micah
the car is a 94 Impreza L with a WRX engine swap.
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Old 09-23-2003, 10:49 PM   #2
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What did you do for the speed sensor, mechanical or electrical?
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Old 09-23-2003, 11:18 PM   #3
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mechanical speed sensor from the old 94 tranny
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Old 09-23-2003, 11:33 PM   #4
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Okay, how did you wire in for the speed signal from the guages to the ECU? I'd start by pulling out a multimeter and seeing what kind of resistance you're getting through that link to see if something is wrong with the wiring. If that's good then check the voltage coming off the guages to see what kind of signal you're getting.
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Old 09-24-2003, 04:40 AM   #5
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Hey I went in detail explaining how this speed sensor works! Um if you want more detail then what I state here search my post on subaru conversions titled "Please help car is cutting out at 4200 RPM's blah blha".

Ok on to the details: Mechanical setup!
1. Does you speedo go up and down? MPH increase as you drive? Does you odometer work?
A) If you answered YES to all then check the wire from the back of the speedo gauge that connects to a little rectangular thing. It is the signal to ECU. Well crap um if you are looking at circuit board it is the wire or circut that has a shape near the gauge on the back. Follow that wire and make sure it is pluged into ECU. Very easy if you have a voltage tester thing that you can tap one side of the wire and tap the other and will beep if it is same wire. So, basically tap device to circut baord and then unplug ECU connector that the speed signal should be going into and see if it beeps if YES then all is good there with that connection. Move onto the grounding of the guage signal just look for the " - " sign near the guage and follow that and do same thing and see if it is grounded. Use a special tool to see if it is grounded and if you don't have it that is cool just manualy ground it yourself to any chassy part in car. If it is grounded and signal is going to ECU and all is correct and still not working then you have to check the actual guage rectangle devcice thing. Basically have to replace gauge. Ok if it was not grounded try it now and see what happens. Did it work? If yes then good to go.

B) If your odometer does not work then you have to check cable. These things are very fragile and break easy. Mine broke when I did my swap. Unplug it from the tranny (be careful when doing this and twist slowly and try not to break gay plastic they put around to turn it with). Grab they key it is called the little metal that comes out of cable on the end where it was connected to tranny. Turn this part either direction and see if it spins at the other end of cable if so then all is good. Obviously if not spinning correct then have to either oil it up and try again or get new one (I had to get new one).

C) If speedo doesn't work then magnet on the cable around the key is not working. Either lost it's magnet effect which is impossible I think or was put on wrong. You have to have that magnet snug to cable not on tranny and cable into it kinda thing.

WOW I am tired sorry if some of this sounds horrible or random or grammer bad. It is real late and have been getting up every day at 6am. Don't hate appreciate ahahahah!

If this does not help get back to me I know how the dam thing works like the back of my hand but dam tired don't know what the hell I just typed or if it makes sense.

BIG THING RESET ECU AFTER YOU FIX IT OR IT WON'T FULLY CORRECT ITSELF!
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Old 09-24-2003, 04:44 AM   #6
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Also, speed sensor not working properly will cause failsafe mode. There are tricks of going around this as a temporary solution so if all else fails I can tell you what to do to trick the ECU into thinking it is getting a signal and will be fine for while. EHEH the wonderful things you discover doing wiring!
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Old 09-24-2003, 07:36 AM   #7
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Yes I do have my speedo working.
Yes I'm in safe mode unless I reset the ECU.
I'll try digging out that wire and hooking it up, and poarya that this works.
Thanks, Micah
Anymore suggestions?!
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Old 09-24-2003, 07:37 PM   #8
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Follow those wires and make sure they go directly to ECU and other is grounded. Most likely it is not grounded. Good luck and get back to me.
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Old 09-28-2003, 08:44 PM   #9
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Hi, I was able to re-ground it but didn't have time to pull my dash to check out where the signal wire should be ran. I was wondering if the MAF sensor could cause me to have a safe mode problem? Does anyone know for sure?
Thanks, Micah
I ask becasue I am using my old MAF sensor no the 02 WRX one.
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Old 09-29-2003, 12:34 PM   #10
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SWITCH IT NOW!!!!!!!!!!!!!!!!!!!!!!
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Old 09-29-2003, 12:54 PM   #11
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yeah I know subaru parts wants $198 and I'm ordering it this week!! but back to the question at hand can it cause the safe mode problem?
Thanks, Micah
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Old 09-29-2003, 11:38 PM   #12
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YES! YES!
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