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AuthorTopic: P38 dse cruise control problem  (Read 4862 times)

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Offline Tel

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P38 dse cruise control problem
« on: August 12, 2009, 16:19:15 »
Got an annoying problem my cruise control only works when it wants too is there any common problems I can check
I take it this systems not vacum opperated like the v8s?

Any help much appriciated
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Offline Rossko

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Re: P38 dse cruise control problem
« Reply #1 on: August 17, 2009, 09:41:14 »
If it is like the V8s, it is vacuum operated, so check the pipes and actuator bladder.   It has a private electric vacuum pump which can seize up.
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Offline Range Rover Blues

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Re: P38 dse cruise control problem
« Reply #2 on: August 18, 2009, 20:42:17 »
My LSE plays up because of the gear slector switch, it only works intermittantly.
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Offline Tel

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Re: P38 dse cruise control problem
« Reply #3 on: August 19, 2009, 08:58:58 »
Right I'm really stuck on this now as I was using it lastnight and it would work for about 10 seconds then turn off it's defently not the brake switch causing it either any ideas?
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Offline Range Rover Blues

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Re: P38 dse cruise control problem
« Reply #4 on: August 24, 2009, 00:09:59 »
I got pee'd off with mine so I built a "tell-tale", a strip of veroboard with one LED for each input or output so I can watch what's happening, I wired it into a spare  cruise ECU because I has already swapped the ECU to no avail.
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Offline waveydavey

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Re: P38 dse cruise control problem
« Reply #5 on: September 16, 2009, 07:26:53 »
On the diesel the cruise control is incorporated to the DDE so if you have no other engine problems it must be a switch input.
Brake
Clutch
handbrake
steering wheel controls
dash switch

If its a manual I would have a look at the clutch switch
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Offline Tel

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Re: P38 dse cruise control problem
« Reply #6 on: September 16, 2009, 13:39:25 »
its an auto

no other egine problems no i think it might be the steering wheel switch ill be looking into that

thanks mate
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Offline Rossko

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Re: P38 dse cruise control problem
« Reply #7 on: September 16, 2009, 18:25:03 »
Do you have this gubbins?
http://www.rangerovers.net/repairdetails/cruisecontrol.html
What's completely missed out of the description there is the little electric vac pump, where the bottom tube goes.
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Offline waveydavey

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Re: P38 dse cruise control problem
« Reply #8 on: September 17, 2009, 06:46:25 »
He won't have; as I said on the Diesel it's part of the DDE; as in it is 100% electronic, no actuators or anything anywhere in the system, it just tells the engine computer how fast to run the engine.
It is a damn good system; essentially nothing to go wrong bar the switches.
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Offline Tel

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Re: P38 dse cruise control problem
« Reply #9 on: September 17, 2009, 12:40:06 »
this is making me think as i have just had the becm replaced under the seat ans it used to work ok beforehand and now it only works when i wants too would this be connected or is it on a differant control unit?

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Offline waveydavey

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Re: P38 dse cruise control problem
« Reply #10 on: September 18, 2009, 07:47:47 »
It could be connected; the Cruise control is actually a part of the DDE which is the computer in the plastic box just behind the battery BUT that is told what to do by the BeCM and the BeCM is what receives the inputs from the controls.

It could be just the plug on the BeCM that has the wire from the controls?
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And a boat - if you can call QM2 a boat?

Offline Tel

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Re: P38 dse cruise control problem
« Reply #11 on: September 18, 2009, 11:37:19 »
I think what I will do In that case is get a contact cleaner and clean up all the plugs on the bcm
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