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Old 02-22-2010, 11:26 AM   #1 (permalink)
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I got a guy who's interested in installing the 2WD/AWD switch, but as I'm remembering now,...

A while ago I was running two different types of tires from front to back. My rear diff was making an awful noise, so I decided to pull the eBrake one click until I got new tires, which I did a couple of days or so later. All good there.

Keep this in mind: When I clicked the eBrake up, the noise went away, and I felt the rear diff disengage...

What I remember is when I clicked the eBrake up, noise was gone. It seemed though as when I made a stop, and took back off, after getting going, the noise was back, even with the eBrake clicked up. It seemed as though the car kept re-engaging AWD. This also happened when just crusing, I would have to put it down, and back up repeatedly, I would say once a minute (roughly). So does the ecu just keep disengaging 2WD?

Sorry if this has been mentioned but I couldn't find any info about it not working..

Thoughts?? Has anybody done any testing to confirm this DOEs in fact work and maybe my car has an odd ecu flash or something?
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Old 02-22-2010, 12:11 PM   #2 (permalink)
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I have had the fwd switch hooked up for over a year. Yes the car does in fact go back into awd once you stop. I believe it also goes back into awd during highway speeds after a period of time. It works best if you are cruising in a low gear and give it a little throttle while switching it over. Wierd how it disengages best when there is a load. The car will also boost more by about 2 psi while in fwd. The car has a mind of its own with the fwd/awd thing no matter if the switch is on or off. You can cheat it like I said by keep moving and putting a load on it while flipping the switch. But it doesnt stay there.
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Old 02-22-2010, 05:05 PM   #3 (permalink)
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Some interesting info from the manual about what logic and sensors 4WD control is based upon.







Seems there is no easy way to cheat/control the 4WD logic without actually reflashing AWD control module.
Alternatively, a CAN translator could be made that would filter requested torque messages coming from DSC and replace them with fake messages based on a potentiometer or a switch.
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Old 02-23-2010, 11:49 AM   #4 (permalink)
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Thanks for the info! Seems there's a lot more to it than just trying to trick the ECU. damn cars are so smart nowadays...
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Old 02-23-2010, 11:17 PM   #5 (permalink)
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QUOTE (fireboy @ Feb 22 2010, 05:05 PM)
Quote:
...Seems there is no easy way to cheat/control the 4WD logic without actually reflashing AWD control module.
Alternatively, a CAN translator could be made that would filter requested torque messages coming from DSC and replace them with fake messages based on a potentiometer or a switch.[/b]
You could switch off the voltage to the clutch solenoid at the awd-cm ( near clutch pedal ) for 2wd, but would likely throw a code. I think FLORZDA tried this with car on a lift.
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Old 02-24-2010, 07:46 PM   #6 (permalink)
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Seems to me that dropping the voltage from pin O on the awd harness should stop the awd from working at all...

May light up the 4WD light, hopefully someone else chimes in if it's been tried.
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Old 02-25-2010, 08:32 AM   #7 (permalink)
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If you wanted FWD drive maybe you should have bought a Speed 3 instead
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Old 02-25-2010, 12:09 PM   #8 (permalink)
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Quote:
Originally Posted by benfura View Post
If you wanted FWD drive maybe you should have bought a Speed 3 instead
Maybe I shouldn't have. The mod isn't for me anyways so please read a little more closely..
Anyways, it is having the option to run both AWD and 2WD, I would guess mainly to save gas. So no, I don't think he wanted FWD, he wants his AWD, and FWD as an option. Get it?
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Old 02-25-2010, 08:44 PM   #9 (permalink)
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Quote:
Originally Posted by benfura View Post
If you wanted FWD drive maybe you should have bought a Speed 3 instead
Now that you mention it. I think I will put my car up for sale.
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Old 03-05-2010, 09:06 AM   #10 (permalink)
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Quote:
Originally Posted by Qwik6 View Post
Now that you mention it. I think I will put my car up for sale.
How much? U willing to trade? lol
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