Engine off coasting on my matrix

[Daox]

The odometer is off while you have the key off (and possibly a few seconds after you key back on). During this time you are not logging distance and throwing off your only means of calculating mpg. A kill switch is preferred since it avoids this.

[Weather Spotter]

Originally Posted by Daox

The odometer is off while you have the key off (and possibly a few seconds after you key back on). During this time you are not logging distance and throwing off your only means of calculating mpg. A kill switch is preferred since it avoids this.

Bingo
Daox- did you rig one up for your matrix? Do you know how on that car?

[tumnasgt]

Originally Posted by Neddy Seagoon

All I do with my Vibe is to stick it in Neutral, turn the engine off with the key, wait a few sec's turn the engine power back on with out hitting the starter and coast. This way I still have power steering while coasting, then bump start it when it necessary. My ScanGauge is in Hybrid mode so that stays on, car will coast quite a way.

Neddy

Unless the Matrix has electric power steering, you won't have power steering unless the motor is spinning. Not moving the key to Off is important though, as most cars will engage the steering lock in this position.

[Daox]

Originally Posted by Weather Spotter

Bingo
Daox- did you rig one up for your matrix? Do you know how on that car?

Nah, I didn't do much EOC on the Matrix. Most of my driving was P&G with the engine on (which led to me never hitting 50 mpg ).

Unfortunately, your pics are too make sense of the diagram.

[Weather Spotter]

Loosing power steering is not a big deal to me.
Locking the column if I were to turn the key one spot to far is very dangerous. So I want a kill switch.

Daox: the diagram is messy but it is all I could find. I am looking at what the EFI circut does.

[Niner]

Those wiring diagrams look like the ones I used to find the injector wire in my Scion xA, your Matrix's little sibling. Do you also have a PDF that lists connector locations? If you can send both of those to me, I got pretty good at reading them and can tell you exactly what wire to cut at what location to cutoff your injectors.

Regarding the relay - does it have 5 connections? I would not use a normally-open relay just because if it fails it will fail in a way that leaves you stranded. What you want to do is interrupt the power side of the injectors (not the ECU side, which gets grounded to shoot gas). Since you're tying into an always-hot line, you can also use that as your power feed for the relay. Then all you have to do is ground the other end of the relay coil and you open the relay.

(Wandered away from my first question there - a 5-prong relay normally has two lines for the coil (nonpolarized), a common connection, and an NC and NO plug).

Look at my other posts and you will see the mod I did for my xA.

[Weather Spotter]

Here is the link for the connection diagram (was to large to upload here so I put it on my gmail):
https://docs.google.com/fileview?id=...thkey=CO-gwPcH

and the wiring diagram as a pdf:
https://docs.google.com/fileview?id=...thkey=CPqT4oQH

there are about 20 more small pdf's with more EE stuff, I can try to find more if you need it.

Thanks!

[Daox]

It looks like all of your injectors splice together at junction l12.




And junction l12 is here:

[Weather Spotter]

So, I should put the kill switch in at junction 12? what voltage is running there? would I still use the same relay setup as with the fuse or would I need to set it up differentially?

[Daox]

The injectors run at 12V. Make sure you splice into the wire after the injectors are all spliced together. It might be easier to do this outside of junction 12.

I'd highly suggest getting either a normally closed switch or NC relay. Theres no real need for a relay, although if a NC relay fails or your switch fails you likely won't have a problem. So, it does provide a little extra fail safety. I wouldn't mess around using an NO relay/switch.