giacomo.m Posted February 9, 2021 Share Posted February 9, 2021 Hi all, 1992 Range Rover Classic 2.5 VM with this problem : suddenly there is no more voltage across the ABS pump connector. maxi fuse 30A: Ok I checked the 3 fuses and they are Ok the pump relay is Ok and I hear them trip at the same time I measured the voltage on the orange cable of the maxi fuse: 5.0 V and at the ends of the pump connector always: 0 V shouldn't I read 12V either way ? you can help me ? thank you Giacomo Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 9, 2021 Share Posted February 9, 2021 Just because the relay clicks, it doesn’t mean it’s conducting power. Try replacing it. If that doesn’t work, then you need to start tracing the voltage break point with a probe to determine if you have a bad connection or a broken wire. Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 9, 2021 Author Share Posted February 9, 2021 Thank you Snagger, but how do you explain that there is only 5 V on the orange cable ? could it be the ignition switch......? Giacomo Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 10, 2021 Share Posted February 10, 2021 Is that always 5v, or is it more with the ignition switched off? I don’t know if it is meant to be only 5v, but it seems unlikely. I’d imagine you have a bad contact where that orange wire connects to the bus bar or battery, perhaps dirt or corrosion, but maybe broken strands in the wire itself, that increase resistance. That would cause a voltage drop when the relay closes, but should give 12v when it is open. Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 10, 2021 Author Share Posted February 10, 2021 Then small update I clean some masses and now I have + 12V at the output of the maxi fuse I hear the relay click ( I also replaced it with a new one ) but the pump does not work ..... thank you Giacomo Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 11, 2021 Share Posted February 11, 2021 Are you getting 12v at the pump input? Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 12, 2021 Author Share Posted February 12, 2021 Good evening everyone the situation is the following: when I connect the connector to the pressure switch, the pump works, the braided tube that goes to the accumulator smokes and after a few seconds the 30A fuse blows .... Giacomo Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 20, 2021 Author Share Posted February 20, 2021 HI all, update on ABS problem, I am attaching the 4 links on youtube where you can clearly see what the current situation is : https://www.youtube.com/watch?v=78gG2jG6Gx0 https://www.youtube.com/watch?v=rHjBes7SpwY https://www.youtube.com/watch?v=JGQwzOvtmv8 https://www.youtube.com/watch?v=z6ERXxM0Tow .... your opinion is very welcome thank you Giacomo Quote Link to comment Share on other sites More sharing options...
P38 Paul Posted February 20, 2021 Share Posted February 20, 2021 Just an observation , but the brown/red wire and the orange wire appear to be crossed at the white connector , does this matter at all , regards Paul . Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 20, 2021 Author Share Posted February 20, 2021 Excellent observation, but I did both tests therefore even with the wires reversed.... Giacomo Quote Link to comment Share on other sites More sharing options...
Snagger Posted February 22, 2021 Share Posted February 22, 2021 I think the pump has been assembled with the internal wiring reversed, so the pump is turning the correct way and pressurising in the first two videos, with the feed wires reversed, but it’s earthing through the hose braiding and blowing the fuse (as well as burning the hose). I think that pump has been rebuilt - I think they normally had a pass I acted casing, not black paint, so I think someone has made a mistake when rebuilding it. Quote Link to comment Share on other sites More sharing options...
giacomo.m Posted February 22, 2021 Author Share Posted February 22, 2021 Hi Snagger, that's exactly how it is, in fact the pump has been rebuilt with an electric motor with the internal wiring reversed, so it works in this way but why does the fuse blow ? the technician who rebuilt it ensures that during their tests the pump works perfectly .... but couldn't it be the ecu ? thank you Giacomo Quote Link to comment Share on other sites More sharing options...
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