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1995-2002 Range Rover P38A
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Discussion Starter #1
Rover shop said my abs pump was out and needed replacing. Looked at all of my options and decided to remove pump assembly and take to localy mechanic to rebuild motor. Figured I would get him to rebuild the motor and I would replace the acculmulator and we're back in business. Well, got a call from mechanic today. Motor is moving fine at good rpm. What? Uhmm.. so I asked him to check the pressure switch as well. Question... how so? When the truck was at the shop the rover mechanic swaped out his p38 assembly in my truck and he said it worked fine. So the assumption is current and fuse are good. How is it that the motor works but doesnt kick on? Guessing pressure switch however, if it checks out can the accumulator cause this?
 

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1995-2002 Range Rover P38A
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1,365 Posts
This might be too late for you, but can you re fit the pump to a P38, connect up and run diagnostics?

The diagnostics should reveal, or point you to, a faulty pressure sensor switch. (it did for me, anyway, and I just replaced the pressure switch).

If the pump part itself is ok, there would be no harm in refitting the whole thing, connecting, bleeding, and then checking the sensor. The sensor can be swapped insitu if it is bad.

I don't know how the sensor can be checked off the vehicle. It contains 3 elements and would need specialist equipment I would say.
 

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I would ask if the mechanic would be willing to swap out the pressure switch from his good one. Chances are that is what is causing the issue. I haven't seen or heard of an accumulator causing a pump to not run at all. When an accumulator fails, the pump may run for a few seconds then turn off, that or run for a really long time before turning off. My money would be on the pressure switch.

I made a small site for this awhile ago. I went down a year or so ago and I did not have a web server to put it on. It has a fair amount of typos so ignore them ;) but many have found it useful. Here it is:http://highlandautos.com/abpmp/. Hopefully it helps, good luck.
 
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Not seen that link above before lrscott, thanks, very useful indeed: It should be a 'Sticky' !

(I wish I had seen it before I decided to dismantle my pump...).
 

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1996 Range Rover P38A 4.6 V8, 2006 L322 4.4AJV8 Vogue
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147 Posts
Nice link Irscott, it's this level of detail that keeps you coming back. Thanks again.
 

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1995-2002 Range Rover P38A
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126 Posts
Discussion Starter #6
Irscott that is great information. What about the pressure switch. I understand it can be rebuilt just as the motor can. But i have yet to find information on the switch rebuild itself. Perhaps I missed something or have misunderstood?

Thanks again
 

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1995-2002 Range Rover P38A
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126 Posts
Discussion Starter #7
Spiggy do you have a source for the pressure switch? Everything I have read says that you cannot buy them individually, only as a part of the assembly? Thanks
 

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Irscott that is great information. What about the pressure switch. I understand it can be rebuilt just as the motor can. But i have yet to find information on the switch rebuild itself. Perhaps I missed something or have misunderstood?
I haven't heard of the pressure switch being rebuilt. I suppose you could clean it, but I just assume get a different one that is good. I have a good pressure switch from my old pump that I'm keepin ;). However, as stated above, the saab ones do work. I would check some local scrap yards, most of the rovers I see have been gutted, but for some reason they seem to leave the abs pump, accumulator, modulator, etc. all in tacked.
 
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