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M35 Stagea Brake Cut Off Mod?

vi3t

By vi3t,
in Four Door Family & Wagoneers

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Whitem35 Rookie

Whitem35

Posted
Posted

Relay will probably work as 0V is normally an earth, but sometimes it is just 0V.

But all is not lost for a dead simple solution. Why not use the Start signal on Pin 42? According to my research, that wire has 9-12V when key in start position & 0V otherwise. Sounds perfect, yes?

Start sig on Pin42.JPG

DIY instructions:

1) Cut wire on Pin55 a few inches from the ECU connector. Strip ECU end & tape up other end.

2) Strip small amount of insulation from wire on Pin42 (leaving wire intact).

3) Solder Pin55 wire (ECU side) onto Pin42 wire & tape up.

Job done :thumbsup:

Simple brake wire mod.JPG

Testing & pics are all yours Scotty. I'm not moving mine from where it is as works just fine, but the above is certainly an easier solution....if it performs as expected.

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joshm35
joshm35

So i followed the above and installed the microswitch at the shifter. Only bit i can add to this thread that i had to use spacers below the switch to raise it of the plastic as the switch was hard up

DrLui
DrLui
scotty nm35
scotty nm35

There is no way you will be able to stall up a 3071 unless you open up the torque converter stator. That said, it should feel better with the wire cut still. I assume you are tapping the pink/blue ec

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Commsman Veteran

Commsman

Posted
Posted

Does anyone know what colour combination wire 42 has

Manual says colour is SB ??

I may have time to check later, but pretty easy to locate it using the ECU pinout diagram. I use the pin positions with NO wires to orientate the drawing.

Commsman Veteran

Commsman

Posted
Posted

So you already had a CEL before making this connection?

There was some conjecture whether the duration of the 12V start signal would be long enough to cancel a CEL.

However it was hoped that if there wasn't a CEL, the start signal might be enough to keep it at bay. Do you want to cancel it & see if it comes back in next few hundred kms?

Whitem35 Rookie

Whitem35

Posted
Posted

Cut wire 55 and drove great for a few days before cel came on, I have a scanner which normally resets any cel that appears but in this case it doesn't reset even with 55-42 joined. How hard is it to wire up to reverse lights?, is it just a matter of connecting the wire from ecu to wire on reverse lights??

Commsman Veteran

Commsman

Posted
Posted

Yes, just take a feed off the reverse lights (check for 12V when in Rev, & nothing when not) & put this into Pin55 on ECU.

Nothing else is required. NB, you may still get a CEL if you go for a long highway drive (I can leave home & not stop for 600km+), but under normal conditions you should go into reverse often enough - or stop at R for a few seconds on way to D, if utilising drive in-drive out parking a lot.

Commsman Veteran

Commsman

Posted
Posted

Yep, exactly the same.

Essentially I have this setup (as well as reverse lights) via a key switch.

When on it gives me the valet setting, ie 12V on pin55 permanently, to limit throttle.

When off it operates as normal & CEL is kept off by 12V from reverse lights.

If you had a 12V ignition source on a switch, you could leave it on when you drop the car to the mechanic. Then you'd be relatively sure the apprentice isn't going hooning on the test drive :)

  • 3 weeks later...
joshm35 Veteran

joshm35

Posted
Posted

What wire number is it. Pin 59 ( 3rd set of pins) is pink with blue trace. 55 (middle set of pins ) is like a red with yellow trace. Is it pin 59 the brake signal in the pin setout a few pages back that I should be connecting reverse lights to??

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