sas Posted January 13, 2014 Share Posted January 13, 2014 P1631 Main relay malfunction i have a ford focus 1.8 02 plate and have this fault where would i find to fix it thanks Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted January 13, 2014 Share Posted January 13, 2014 start by disconnecting the battery, then go to the fusebox, remove and replace (securely) all the wiring harnesses. Quote Link to comment Share on other sites More sharing options...
sas Posted January 13, 2014 Author Share Posted January 13, 2014 is that engine harness only or is it dash board harness aswell thx Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted January 14, 2014 Share Posted January 14, 2014 Hi Peter, Just start with the fusebox in the passenger footwell, that isnt the engine harness but at least allows you to rule out the issue as being anything more than a loose connection. Quote Link to comment Share on other sites More sharing options...
sas Posted January 14, 2014 Author Share Posted January 14, 2014 ok thx Quote Link to comment Share on other sites More sharing options...
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