 | Home > Puma (Tdci) > REVERSING IN HIGH RATIO IN MY 90 |
 
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971   
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That doesn't mirror my experience.
There is no switch telling it that you're in gear. It will do it if you're not in gear and you just roll down a hill slightly, and will also do it whilst slipping the clutch in second if you manage to get the revs so it thinks it's in first. |
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25th Jul 2016 4:10pm |
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| Wild Card 90 Member Since: 03 Dec 2014 Location: Gerlingen Posts: 1060  
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Normal stationary idle speed is 800 rpm.
The vehicle moving (rolling or in gear, clutch in or out) activates a raised idle speed, which is 900 rpm if high ratio is selected, and 1100 rpm if low ratio is selected. The ECU probably gets wheel movement info through an ABS sensor, and the hi/lo info through the second switch on the box. The combination decides whether 800, 900 or 1100 rpm is required. I bet thereīs something amiss with the connection to the hi/lo switch. Good luck! 1998 Tdi 90 SW, 2008 Td4 90 SW, 2012 2.2 90 SW, 2" raised Trailmaster/Terrafirma Heavy Track Raids, 255 MTīs, Recaro CSīs, anorak, wellingtons |
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25th Jul 2016 7:58pm |
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| Wild Card 90 Member Since: 03 Dec 2014 Location: Gerlingen Posts: 1060
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   1998 Tdi 90 SW,
2008 Td4 90 SW, 2012 2.2 90 SW, 2" raised Trailmaster/Terrafirma Heavy Track Raids, 255 MTīs, Recaro CSīs, anorak, wellingtons |
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26th Jul 2016 6:23pm |
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| Eau02467 Member Since: 20 May 2015 Location: Glasgow Posts: 48 
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It is a combination of the clutch switch as well as the high low switch on the transfer box that turns on idle jack, it is turned off by the speedometer transponder as has already been said. In this case it will be the high low switch that is at fault or the positive cable leading to it is shorting. If the clutch switch is fault you get a distinctive rev hang between gear changes in the 2.4 as well as surging just after changing gear under heavy acceleration
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31st Jul 2016 7:02pm |
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| Cheshire110 Member Since: 26 Jul 2013 Location: Cheshire/London Posts: 2754
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Not useful knowledge, but I always wish that there was a way of doing idle jack in neutral so that I can use it as a power heater / warmup!! Cheers, David
Land Rovers of all shapes S3 onwardsâĶ Daily is a 110 V8. |
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31st Jul 2016 9:40pm |
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| davew Member Since: 02 Jan 2012 Location: North Yorkshire Posts: 888 
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Does the Puma not do the same as the TD5 ? On the TD5, if the ECU thinks it's in low box it stops you exceeding 30MPH, lighting up the engine warning light and cutting engine power. http://www.yorkshireoffroadclub.net/ |
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31st Jul 2016 10:50pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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davew: I've driven fairly quickly in low 6th and it hasn't complained at me yet. I know I should have changed up but I'm not very good at on the move range changes and it tends to make a rather alarming bang.
Me too! but for other purposes. I was wondering if I could change the inputs of my cruise control to an RPM signal to have a cruise activated high idle. |
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1st Aug 2016 7:33am |
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| Eau02467 Member Since: 20 May 2015 Location: Glasgow Posts: 48
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It is a combination of the clutch switch as well as the high low switch on the transfer box that turns on idle jack, it is turned off by the speedometer transponder as has already been said. In this case it will be the high low switch that is at fault or the positive cable leading to it is shorting. If the clutch switch is fault you get a distinctive rev hang between gear changes in the 2.4 as well as surging just after changing gear under heavy acceleration
Does the Puma not do the same as the TD5 ? On the TD5, if the ECU thinks it's in low box it stops you exceeding 30MPH, lighting up the engine warning light and cutting engine power. -Never tried it but I doubt it, -The puma behaves differently at low speeds due to the extremely low first gear ratio hence needing idle jack to avoid loss of control in hill descents |
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1st Aug 2016 8:15pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17378 
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Not possible, I'm afraid, though heaven knows why LR didn't make this possible (like many Jap 4x4s). The ECU will shut down the throttle input if you increase the idle when stationary, eg if you want to increase engine speed when winching. For the Td5 there was an optional hand throttle available as a factory fit for the extortionate sum of about Ģ1200, but never as far as I know for the Puma. The daft thing is that a software mod and one switch would probably do it, but without access to the programming data it would be very difficult. I don't know of any aftermarket solutions either. |
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1st Aug 2016 8:29pm |
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| Eau02467 Member Since: 20 May 2015 Location: Glasgow Posts: 48
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I am fairly sure BAS or one of the others could do this for you for a small fee
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1st Aug 2016 8:36pm |
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