75ZT CommunityA social community of enthusiasts, owners, appreciators and collectors. With expert knowledge of all things from MG to Rover and beyond.2012-08-11T13:40:12+00:00https://www.75ztcommunity.co.uk/feed.php?f=27&t=4249&mode2012-08-11T13:40:12+00:002012-08-11T13:40:12+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=56389#p56389I thought we were on to something when we found that the immobiliser was damp but all the connectors etc. have been dried and are OK. The looms, as far as can be seen, are well wrapped and tethered at any critical point, there is not much left now to investigate.
]]>2012-08-11T13:24:53+00:002012-08-11T13:24:53+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=56388#p56388 When working properly it should switch rapidy (9600 baud) between Vbat and ground less a few mV. If it changes significantly as the fault comes and goes, then something is affecting the bus. That could be a wire running over a sharp edge, or still water in something (though I'm struggling to suggest what)
]]>2012-08-11T13:17:41+00:002012-08-11T13:17:41+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=56387#p56387
]]>2012-08-10T20:37:11+00:002012-08-10T20:37:11+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=56370#p56370certainly switched on and off by moving the loom at the connector end to the offside connector of the instrument cluster. Aha! Indicates a poor connection here or a dry joint on the connector to pcb pads, I convinced myself .
Connectors all looked good so stripped the cluster down and re-flowed the relevant joints. Then spent 1/2 hour looking for one of the instrument needles. Fault does not come and go with the movement any more but is back to the 10-15 minute running OK syndrome. At this point the breaker's yard is looking more attractive but I don't really want to give up, I've spent too long on it and don't like to be beaten.
What I cannot get my head around is how we could provoke the fault for a short time by moving the loom at four different places so far in turn but only until we investigate that point whereupon the fault goes back into its cycle of being OK for several minutes and cannot be provoked again during that time.
I think that I now need to eliminate the cluster so as not to get bogged down by it plus I don't know what else to try. What are the implications of trying a cluster from another vehicle for the purposes of elimination?
]]>2012-04-29T10:23:28+00:002012-04-29T10:23:28+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=49238#p49238
]]>2012-04-26T06:28:11+00:002012-04-26T06:28:11+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=49004#p49004 bcu-problem-t3905.html#p35697
]]>2012-04-25T18:07:07+00:002012-04-25T18:07:07+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=48989#p48989
]]>2012-04-25T15:54:33+00:002012-04-25T15:54:33+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=48981#p48981 Bad news is that it now comes back but only after 20 minutes running.
]]>2011-09-25T21:01:45+00:002011-09-25T21:01:45+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=38367#p38367
]]>2011-09-25T09:27:58+00:002011-09-25T09:27:58+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4249&p=38339#p38339We have a donor car from a friend who wants rid of it.
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