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#1
09-03-2010, 02:57 AM
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pls explain variable w140 power steering
How does the system work? What triggers the system? What causes/actuates the lightness/stiffness of the steering? Is it gradual or on/off, light/heavy?
Can it be disabled? I want to be able to set it at "normal", disconnecting all electronic assistance. Possible?
__________________
 85 190E 2.3(SOLD) 86 230E (-->300D) sold 87 300D (-->300TD) sold 68 250S w/ a 615 and manual tranny (RIP) 87 300TD (SOLD) 95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded 86 190E 2.3... current project 
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#2
09-03-2010, 09:36 AM
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Not sure how the MB one works. But the Ford setup works like this. There is a restrictor "valve" at the pump. During full assist the valve is backed off allowing full flow. As speeds increase the ECU commands the valve to start closing off fluid flow and thus reducing assist.
Most thought it worked the other way, that at low speeds it was working to provide more assist. But it only does its thing to reduce. So if one unplugged the valve on a Ford it would be full time assist. The only way to make full-time low-assist steering would be to install a potentiometer and control the valve manually. Just prey you never, ever have to avoid an accident!! The Ford system, at least, monitors steering wheel movement and at higher speeds when assist is reduced it will return some or all power during quick movements, such as to avoid a deer.
__________________
1991 560 SEL / 185k miles 1992 750il / 17k miles - project car
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#3
09-03-2010, 10:16 AM
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The MB speed sensitive steering works via a non serviceable valve on the steering box. I gets its signal from the engine electronics either from the ASR or ADS. The module in the computer box processes the signal and the pressure is reduced as speed increases, at stand-still max pressure and system default is max power steering. This applies to the 140 body, I dont know how how the cars with rack and pinion are handled.
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#4
09-05-2010, 10:10 PM
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thanks for the info guys...
sooo... if the w140 valve/actuator doesn't receive a signal...say if it were disconnected somehow...it will just function at full assist then?
__________________
85 190E 2.3(SOLD) 86 230E (-->300D) sold 87 300D (-->300TD) sold 68 250S w/ a 615 and manual tranny (RIP) 87 300TD (SOLD) 95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded 86 190E 2.3... current project
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#5
09-06-2010, 07:57 AM
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I would think so, follow the wire that comes out of it, there is a connector. I dont know what kind of error code it will set if the module does not see the valve.
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#6
09-06-2010, 10:01 PM
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i'm "simplifying" the w140.
 error codes won't matter when i'm done with this submerged heap.
__________________
85 190E 2.3(SOLD) 86 230E (-->300D) sold 87 300D (-->300TD) sold 68 250S w/ a 615 and manual tranny (RIP) 87 300TD (SOLD) 95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded 86 190E 2.3... current project
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