As I was probing the signals on the ECU of the '90 Vert that has been dropped on my lap, I came across something quite strange...

There appears to be a pin (I forget the number), that I have lovingly named the "Canada Ground". Aparrently if the car is ANYWHERE else in the world, this pin is an open, causing a 12V signal to be applied to the ECU. But if you are in CANADA, this pin must be grounded.

Now here is the question... WHAT THE HECK DOES THIS DO??!?!?

The only thing I could come up with is, that with this pin grounded, your FC will have uncontrollable urges to watch hockey. In addition, it might cause your FC to pronounce "about" like "aboot". Anyone care to shed some more light on this?

Jarrett

 

something to do with the day time lights maybe??... cause only canada has them. I don't think the ecu would run them though.

 

It adds about 50rwhp for all us lucky Canucks! Ha!

















But seriously... last I checked, Canadian 7's didn't have DTRL (may not be the same for verts, though I don't know why). Maybe for a block heater? I have no other ideas as our 7's were made in the same factory as yours, so they should be the same.

 

what pin number???

 

I cant get the FSU off of FC3s.org right now, so I have to go home and get my notes. The pin is located on the pin-out for the ECU. I can get you a pin # in about 1 hour.

Jarrett

 

It's pin 2J. The ECU wiring diagram shows it grounded with the note "Canada only". I've always wondered what that was for.

 

Its the trigger wire for the DRL. With it grounded it sends a 7 Volt signal to the fog light whenever the engine is running.

Oh yeah, DRL= daylight running lights (manditory in Canada in like 89 or 90 on)

 

IMHO - DRL's need to be full bright.
I need to trace that signal. Maybe I can find a resistor to shunt, that would simplify my wiring.

I am currently using an ignition switched source to feed the fog light switch.

I don't get cut off nearly as much as I used to.

BTW - I have a mirror host of the FSM's in my sig below.

 

well the feed out of the ECU for the DRL/fogs is Pin 1S on the ECU, I suppose you could use that. But I don't know what the wattage of the canadian lights are... so you'll need to be careful on the draw.

 

Good point - that lead could run right past the relay, directly to the lights.
I am using 55w H3's.
I'll check it out this weekend.

 

Cool! Thanks for the info!

Jarrett

 

hey I was right and only guessed

 

I'm with the fellow that mentioned the day time running lights. See wiring diagram E-2 of the 91 manual. The one titled CANADA {DAYTIME RUNNING LIGHT CONTROL SYSTEM *FOG LIGHTS *HEADLIGHTS} There's a red/green wire going from the DTRL control unit to the ECU.

That's not real proof.......its a work in progress. No time right now. Later.

 

According to the ECU wiring diagram on page F2-8 of the 89 FSM there are two pins on the ECU that appear to be for Canadian cars only. The one I mentioned above (2J) is just a ground, but the other one (1S) goes to the foglight relay. So what's 2J for?

 

2J allows, the circuit that is hooked to 1S to switch voltage, based on the engine running/on.

 

Foggy picture:


http://www.teamfc3s.org/forum/showth...threadid=13140

 

think you meant this:

 

but looking at that diagram, the DRL signal to the fogs is being sent into the ECM, which would suggest the ECM was using the lead to activate something when the 2J wire is grounded.

 

Ah, that makes sense.

 

damn..

heres a mod: ground it and rewire it from the foglight the lowbeam of the headlight..

that way youd have the headlight on with the retractor down, which looks NICE!

i was considering doing that with my s4.. i dont think the s4s are like that though because DRLs werent standard until 90-91..

 

hmmm... that would be cool.. only work on s5 though.


and and as for the topic. the difference is, the canadian ground is colder