Humbug
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| posted on 28/7/05 at 10:02 PM |
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K-series help! - rough road sensor
My engine is from a 2001 R25 1.4 K-series. My auto electrician has located some wires that, according to the manual, are for the rough road sensor. My
question is: do I actually have to have a rough road sensor connected for the ECU to work, or can I just tape up the ends of the wires and forget
about them?
Second question - what exactly is a rough road sensor and how could I fit it if I did need one?
Thanks in advance
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britishtrident
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| posted on 29/7/05 at 05:55 AM |
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Rough road sensor is fitted with the MEMS 3 system, it prevents the misfire detection fault code in the ecu being triggered by rough roads. If you are
using a MEMS 3 in theory you need it connected I am not sure exactly how it functions could be a simple mercury tilt switch.
[Edited on 29/7/05 by britishtrident]
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Humbug
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| posted on 29/7/05 at 06:09 AM |
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quote:
Originally posted by britishtrident
Rough road sensor is fitted with the MEMS 3 system, it prevents the misfire detection fault code in the ecu being triggered by rough roads. If you are
using a MEMS 3 in theory you need it connected I am not sure exactly how it functions could be a simple mercury tilt switch.
[Edited on 29/7/05 by britishtrident]
Thanks... so, in theory, what would happen on a rough road? Does it just indicate a misfire or would it actually do somthing, like shut down? Any
idea?
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britishtrident
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| posted on 29/7/05 at 07:18 AM |
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I had a quick look at the 25 MEMS manual the bad news is the sensor signal comes from the front LH ABS sensor (even on cars without ABS) it is a
0 to 5 volt square wave at 800 pulses per mile.
I don't know the effect of the ECU not getting signal, I know it will set an OBD p code but don't now if it wll trigger the
malfunction warning lamp or trigger a limp home mode --- I suspect it won't but I don't know.
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britishtrident
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| posted on 29/7/05 at 02:50 PM |
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Keep us posted on how you get on --- the MEMS3 system is significantly different from the more usual MEMS1.9 but it introduces more interesting
features such reading OBD data and tweaking the fueling and ignition advance via the EOBD socket.
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Humbug
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| posted on 29/7/05 at 03:03 PM |
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Spoke to a Rover dealer parts department - the bloke there first of all tried to say there was no such thing as a rough road sensor. Then came back
and said it's the same as an ABS sensor and is £113+VAT! Thought it "probably" would be OK just to complete the circuit so the ECU
can't identify a broken circuit... not sure about that. I think I'll try first with nothing on the wires (and kept separate. If that
doesn't work, I could try completing the circuit.
I have also searched on the MG Rover forum, but nothing useful so far.
Also tried Blatchat (Cateringvan) but their search facility is down 
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Humbug
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| posted on 29/7/05 at 03:05 PM |
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quote:
Originally posted by britishtrident
I had a quick look at the 25 MEMS manua...l
Is the manual for the MEMS3? If so, do you have info on how the immobiliser telltale LED is wired? I have a separate LED with 2 wires, but I'm
not sure how they should be connected. Does it go through the ECU or just 1 live and 1 to the immobiliser (and if so, which plug/which pin?)?
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britishtrident
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| posted on 29/7/05 at 03:24 PM |
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RAVE CD with all the Rover manuals in pdf format usually can be found on Ebay for a fiver or less :-)
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