remote start, 2004 subaru wrx

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mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 08, 2008 at 5:10 PM / IP Logged

i just got a remote start for one of my vehicles and everything is installed and works good except for the remote start function. it will not remote start the vehicle it just blinks the Diag. code which is seven which means the system does not detect a Tach singnal. all grounds are good and the Tach wire is connected to the proper wire right on the ECM. now i guess u can turn off this feature if u want with this system but even in Tach or Tachless mode it still flashes code seven. there is an Auto learn for the tach and when i do so the system verifys the procedure with parking light flashes but the antenna is also sopposed to flash as well and it does not.keep in mind the hood switch re-arm,dis-arm connections have not been made. i do notice the LED's on the antenna to blink very dim at all times, i dont know if that means anything

the model of the RS system is an Ultra Start G series.the LED issue does seem like a ground issue but i checked all grounds and they are good(there are two) the car that it is installed in is a 2004 subaru wrx. like i said it just keeps giving me a daig code seven.evertime i start the vehicle normally i always get the blinking park lights to verify the auto Tach learn if that means anything as well. i dont have the hood switch hooked up at the moment but i dont think that will give me the prob im having now.

tedmond

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Location: Ontario, Canada

Posted: December 08, 2008 at 6:42 PM / IP Logged

never hurts to check the ground. a faulty ground can arise numberous problems.

KarTuneMan

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Joined: December 14, 2004

Location: Isle Of Man

Posted: December 08, 2008 at 8:01 PM / IP Logged

The hood pin missing has nothing to do with your tach issue...... but get it hooked up. Safety first!

And tedski has a good point...

Where exactly did you get your tach? wire color etc.... Astro has 3 potentials.... none are at an ECM.

Look for a blue/green at a brown plug next to the main ign. harness connector.

JWorm

Platinum - Posts: 2,208

Joined: December 11, 2002

Location: New Hampshire, United States

Posted: December 08, 2008 at 8:19 PM / IP Logged

Go here for an ECU wiring diagram:

ECU

You want to use a fuel injector wire at the ECU....located at the top of page 3 of the diagram I linked to. It tells you what plug, and what pin you will find the wire. If I remember correctly, the fuel injector wires are yellow with a stripe. It will read between 1 and 2.5 volts AC with the car at idle, and increase if you rev the engine.

On Subarus, if you use the wire commonly listed as tach on wiring diagrams it won't work with a lot of remote starters out there. I know Ultrastart units have trouble with Subaru "tach" wires.

mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 08, 2008 at 9:45 PM / IP Logged

i got to tach singnal from plug B134 at the ECU which is listed as Engine Speed. the manual does state to use this wire but i guess any waveform ACv wire could due. the wire color is a solid green and the RS is an ultrastart

i have access to diagrams for all vehicles and the green wire looks like it does go through the Tach on the cluster and is listed as Engine Speed like i said before which is pin 23. thanks!

ANYMORE INPUT WOULD BE GREAT!

mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 08, 2008 at 9:48 PM / IP Logged

the LED's on the antenna blink dim most f the time sometimes they do get bright like when i do the Tach learn process and programing. are the LED's sopposed to be bright all the time? because that sounds like a bad ground but they are good,but im going to jump the ground right to the batt to check them again.

mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 08, 2008 at 10:15 PM / IP Logged

hey jworm! listen to this my diagrams say the injector wires in plug B136 if u look on the diagram itself it shows them on B135 and looking at your diagram it shows them on B137! HAHA., theres 4 plugs on the ECU and Subaru is horrible with there wiring diagrams and they do not show u in any way what plug is which and if u unplug the plugs there all the same except for one lol

JWorm

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Joined: December 11, 2002

Location: New Hampshire, United States

Posted: December 08, 2008 at 10:54 PM / IP Logged

I have done at least a dozen WRX's and STI's from 2002-07. The ECU varies from year to year, and the WRX, STI and RS all have different ECU's. A lot of the guys on the Subaru forums bring their cars to me because I know the cars so well. I had an 02 WRX, and an 05 STI.

The ECU plugs may look very similar, but there are differences in pin count. Does your ECU have 4 or 5 plugs? This page will give you different diagrams to choose from. I would start with the 2004, then find the ECU diagram that has the correct number of plugs. You don't need to unplug any of the harnesses to find out the plug number, you can do it by comparing the pin count and positions. I have always had great luck finding the correct wires using the above page.

The green wire you are referring to has too high of a reading, and most remote starters won't learn the signal properly. If it does learn it, it will often overcrank the starter.

mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 09, 2008 at 4:57 AM / IP Logged

the ECU has four plugs on it. the RS system wont even Tach learn at the moment to the green wire that it is hooked up too the tach signal . i would of figured it would of auto learn it but like u said it prob would over crank.. i am Def going to try to hook into an injector wire like u said.

mtlman

Member - Posts: 19

Joined: December 08, 2008

Location: New York, United States

Posted: December 09, 2008 at 3:23 PM / IP Logged

Ok so i tried a few things today. i reconnected the tach wire to an injector wire on the ECU which are all Pink and i even checked it with a DVOM while running and off and i got .8v(ac)running and 0v(ac) off. now that being said i also reconnected the hood pin wire and tried it out and it still does the same thing (not start with RS) it just flashes code seven! i rechecked all grounds with a test light and even put new crimp connectors on them i also checked all power connections with a DVOM and that was good as well. i reset the system and did the Tach learn again which it always verifys with the flashes but still no start wiht the RS????? i think i am now going crazy!

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