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Old 30-01-2011   #1
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Clutch switch?

Why is there a switch on the clutch, similar to the one on the brake pedal?

I guess its because the ECU needs to know when the clutch is being pressed, but why does it need to know?

Could a faulty switch, one that tells the ECU the clutch is contantly being pressed, cause a drop in BHP?
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Old 30-01-2011   #2
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Re: Clutch switch?

It has 2 uses, first to hold revs when changing gear (only for about a second) to enable smoother gear changes, and second to deactivate cruise control when clutch is touched (on those with cc).
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Old 30-01-2011   #3
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Re: Clutch switch?

Could it effect BHP if the switch was faulty?
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Old 30-01-2011   #4
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Re: Clutch switch?

Quote Originally Posted by Shadeyman View Post
Could it effect BHP if the switch was faulty?
Not quite sure to be honest.
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Old 02-02-2011   #5
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Re: Clutch switch?

Quote Originally Posted by Shadeyman View Post
Could it effect BHP if the switch was faulty?
Definitely - no.
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Old 03-02-2011   #6
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Re: Clutch switch?

Any chance someone could provide a bit more detail as to where to locate this clutch switch?? Mine may me faulty as the rev's drop immediately when the clutch pressed.

About once in a blue moon the rev's will remain high for about a second when pressing the clutch in my car.

A pic would be super for other users on here
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Old 03-02-2011   #7
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Re: Clutch switch?

Top of the clutch pedal, similar position to the brake pedal switch.

Item 3 in this diagram.
.
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Old 24-02-2011   #8
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Talking Re: Clutch switch?

If anyone knows the answer to this question please enlighten me as I am on a serious quest to determine the solution to a serious problem with my car

Could a faulty clutch switch have any effects on the behavior of the ECU and its fuel management system? My query specified further, could a faulty clutch switch interfere with the ECU and manipulate a cut out of fuel in to the engine? Or can it in any way possible simply interfere with the ECU system whatsoever??
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Old 24-02-2011   #9
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Re: Clutch switch?

Never did find out for sure if it can effect BHP(eg. if the ECU thinks the clutch is pressed will it hold the engine back when the throttle is pressed). Lets hope you have more success.
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Last edited by Shadeyman; 24-02-2011 at 17:52.
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Old 24-02-2011   #10
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Re: Clutch switch?

You could test drive it with the switch disconnected to find out. Worst thing that could happen is that it registers a clutch pedal switch fault.
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Old 24-02-2011   #11
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Talking Re: Clutch switch?

Quote Originally Posted by Shadeyman View Post
Never did find out for sure if it can effect BHP(eg. if the ECU thinks the clutch is pressed will it hold the engine back when the throttle is pressed). Lets hope you have more success.
Yes that is true, no definite answer was really stated on the thread, I did keep an eye on it for a while but nothing came through

I also did carry out a wide search on Bosch ECU`s and general ECU operations and programming following your Dodgy Geezer thread but I had no luck what so ever again , both in the forum and the internet, the subject on the thread got me going after recent events, I am still hunting and I will find something, never give in, stubborn determination which only rests when I fall asleep.....
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Old 24-02-2011   #12
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Talking Re: Clutch switch?

Quote Originally Posted by Davren View Post
You could test drive it with the switch disconnected to find out. Worst thing that could happen is that it registers a clutch pedal switch fault.
Thanks for the info, I will definitely give it a try and see if my kangarooing JTD calms back down to normality
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Old 24-02-2011   #13
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Re: Clutch switch?

I just diconnected the switch as Davren suggested and drove about 2 miles on a local dual carriageway. No errors reported via the dash and it did seem a little quicker but couldn't be 100% sure. Could this mean I have a faulty clutch switch?

I started the Dodgey Geezer thread because I've been looking to buy a summer project car and I was suspicious of a car I went to see. The price was low and the problems easy to fix, I thought maybe he had unplugged a few sensors to cover a more serious fault.
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Last edited by Shadeyman; 24-02-2011 at 18:37.
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Old 24-02-2011   #14
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Re: Clutch switch?

Quote Originally Posted by Shadeyman View Post
Could this mean I have a faulty clutch switch?
Not neccessarily, I think it's main function is to disengage Cruise Control but as it's also fitted to Stilos without CC, I suspect it has a minor influence on engine performance. Possibly just improved driveability when changing gear.
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Old 24-02-2011   #15
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Talking Re: Clutch switch?

Quote Originally Posted by Shadeyman View Post
I just diconnected the switch as Davren suggested and drove about 2 miles on a local dual carriageway. No errors reported via the dash and it did seem a little quicker but couldn't be 100% sure. Could this mean I have a faulty clutch switch?
Another mystery Shadeyman.......

You are running your ECU scan through an ELM 327 v1.3b cable right? So you are getting a near on full feed of the ECU diagnostics right? So no error codes appeared and it seemed to run better... to be honest I will may look in to replacing the part and seeing how it goes from there.

Just a quick question, did your query regarding the clutch switch derive from unusual throttle response??
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