 | Home > Puma (Tdci) > Clutch sensor |
 
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389   
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I'm now thoroughly confused about the logic of this circuit...
All the advice is that the clutch switch is normally closed, and opens when the clutch is depressed, which is supported by what the workshop manual says. Mine does the opposite - tested with a multimeter across the two pins at the switch, it's normally open and closes when the clutch is depressed more than about half an inch, which is the wrong way around... This appears to be backed up with the BAS tool, which has the 'TCM - Clutch pedal position top of travel' as False when the clutch is released, and True when it is depressed - the opposite to what I would expect to see. So I disconnected it and bridged across the plug - the pedal becomes like stepping on a landmine - the slightest movement on or off the throttle demonstrates all the backlash in the transmission at once. Then disconnected and open circuit - the opposite effect - massive rev hang on up-changes (2-3 second delay before the revs start to die back). I can't see variations in the operation of the circuit in later vehicles (mine's a 2015) - does anybody know any different? --- 2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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10th Jan 2019 1:09pm |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389
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Found a new part to test at the dealer, and apparently they are all the same from 2007 on.
The workshop manual is wrong - the switch is normally open, tested across the pins with a meter. Still can't explain why it shows the wrong way around on the diagnostic, but that's how it works. --- 2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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10th Jan 2019 1:59pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282  
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Everyone says that but actually whilst it isn't a factory feature of the 2.4 it is a feature all the same. Mine got really bad a while back, lubricating everything in the clutch housing helped. I'm now convinced I need to change (or disconnect) the switch because my rev hang is awful again. As I dip the clutch the revs rise by approx 500rpm from where they were and drop a few seconds later. Now: 2010 2.4 TDCi 110 Utility Wagon Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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10th Jan 2019 3:17pm |
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| Hal Member Since: 04 Jun 2014 Location: Bedford Posts: 91 
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Hi Ozzie1989
Did you ever get this resolved? My 2.4 2011 s/w has just started doing exactly what you describe - dip clutch, revs go up a few hundred and then down again. Only seems to happen changing first to second, but i get the feeling that revs don't drop away like they used to in higher gear changes Anyone else with a 2.4 puma seen this? Thx Hal |
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3rd Sep 2019 7:35pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19620
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It will be a failing clutch switch.
If your getting backlash with it bridged then you have excessive drivetrain wear, the clutch switch delay / hang masks that wear and tear and if anything giving a drivetrain input that's is not smooth is going to extend and add to drivetrain wear by far. You must slow down going on to the power when going into gear, also it should be in gear before you apply the power. I've never had a problem since I have bridged mine, it drives better than ever and oh so much smoother with driver input rather than ECU screwing over every gear change creating unstable on/off irregular torque. That will definitely increase wear and tear, and make sure going though the gears a pleasure. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 Last edited by custom90 on 3rd Sep 2019 8:44pm. Edited 1 time in total |
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3rd Sep 2019 8:13pm |
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| Hal Member Since: 04 Jun 2014 Location: Bedford Posts: 91
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Thanks custom90steve
Does the 2.4 have a clutch switch? I've been through the w/s manual page by page and cant see it. Any idea where it is? I've had the clutch pedal cover off in the past to grease everything and cant remember seeing anything around there. |
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3rd Sep 2019 8:20pm |
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| htb2 Member Since: 02 Nov 2018 Location: aberdeenshire Posts: 510 
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If its the same as a TD5 location. its on the output pipe from the clutch master cylinder
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3rd Sep 2019 8:30pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19620
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Yep, the 2.4 has one.
It's located near the bulkhead just to the right of the brake master cylinder, to the left of the coolant expansion tank. You will see the black plastic, connector with two wires exiting it. This is a 2.2 motor I think but it is located in the same place on 2.4's too.  Click image to enlarge As I mentioned previously, you cannot just disconnect it on a 2.4 or 2.2. You can on a TD5 I believe, but not these. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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3rd Sep 2019 8:51pm |
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| Hal Member Since: 04 Jun 2014 Location: Bedford Posts: 91
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Thanks!
Found it also on connector c0667r in electrical connector manual Hal |
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3rd Sep 2019 9:44pm |
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| Zed Member Since: 07 Oct 2017 Location: In the woods Posts: 3028 
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Last edited by Zed on 3rd Sep 2019 9:50pm. Edited 1 time in total |
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3rd Sep 2019 9:49pm |
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| 90 Dreamer Member Since: 13 Jul 2019 Location: Oop North Posts: 2055 
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What is it supposed to achieve??
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3rd Sep 2019 9:50pm |
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