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Old 01-31-2005, 11:28 AM   #1
bryan_johnson
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Default Purpose of neutral switch?

Does anyone know what the purpose of the neutral switch on manual transmissions is? The ECU seems to monitor it for some reason. What happens when it is not hooked up (open) or jumpered (closed)?

/Bryan
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Old 01-31-2005, 11:40 AM   #2
AKGC8
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Why don't they let us delete posts.

When I have time later I'll try to get back to this.
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Old 01-31-2005, 11:45 AM   #3
BAC5.2
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Aren't you thinking about the Clutch switch?

If the car is in neutral, and the clutch is disengaged, the car will not start.

I would guess, that the neutral switch just gives the ECU more information as to what the car is doing. If it's going 85mph, and the engine is steady at 3500RPM, and the neutral switch is off, then everything is awesome. If the same scenario is happening, but neutral switch is on, then the ECU might have some trouble understanding this. It was designed to use a proper neutral switch, so you should hook it back up.

It's also related to cruise control. Neutral switch on = no cruise control.
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Old 01-31-2005, 12:55 PM   #4
bryan_johnson
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The cruise control requirement makes sense. I am mating the soob motor up to a transaxle with no neutral switch (VW transaxle), but I don't have cruise, so I guess I'll just see what happens when I jumper it, or leave it open.

Thanks for your ideas.
Bryan
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Old 01-31-2005, 01:26 PM   #5
Legacy777
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Read this post & my reply.
http://www.ultimatesubaru.net/forum/...neutral+switch

If you tie the neutral switch to the clutch interlock switch the ECU will have a relatively good interpretation as to when the car is in neutral and when it's not.
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Old 01-31-2005, 01:27 PM   #6
GTScoob
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I've heard rumors that the ECU adjusts timing when the car is in neutral

It also probably ties into the ABS, cruise control, and starter interlock.
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Old 01-31-2005, 11:49 PM   #7
AKGC8
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Okay, in the factory service manual, the only places I can find reference to the nps signal is with ignition during engine start and the idle air control.

The only 2 fault codes for NPS are high input and low input. The trouble symptom for both codes is erroneous idle.

So I doubt you'd have to much problems just splicing into the clutch switch and using that, may experience rough idle judging from the fault codes though.
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Old 02-01-2005, 03:55 AM   #8
andys
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my guess is that it's a for a combination of the idle air control and the air conditioning.
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Old 02-01-2005, 06:29 AM   #9
AKGC8
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I don't think it does anything for A/C. The ECU takes a signal from A/C and NPS and adjusts the idle air control solenoid valve accordingly(and from a number of other sensors as well). So when you're in neutral with the A/C running it raises the idle.
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Old 02-01-2005, 11:20 AM   #10
bryan_johnson
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Thanks for looking into that Eby. When I get this project running, I'll let you guys know how it worked out.
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