Tom Posted August 4, 2012 Report Share Posted August 4, 2012 I am preparing to install my wire-in G4 extreme. The dealer supplied a harness for my car. I have noticed that the colors in the G4 install manual do not match the wire colors in my harness. There are lots of wires with the same colors in my harness (red, black, brown, white, almost none with tracer stripes). Is that normal? Makes it harder to reference the manual and trace wires if nothing else... Second, I had to trace back to the ECU connectors with a multimeter to find where the MAP was wired in (it is AN 5) and in doing so I noticed that it (and perhaps some of the other sensors) are wired to GROUND (pin 34 in plug A)  rather than to a SENSOR GROUND (such as pin 24 in plug A). Is that ok and what is the difference between a SENSOR GROUND and GROUND?  Quote Link to comment Share on other sites More sharing options...
Simon Posted August 6, 2012 Report Share Posted August 6, 2012 The grounds are all common on the board so you can get away with it. But it would be better to have them following what the pinout suggests. Looms normally match the suggested colours in the manual. However some dealers have produced milspec looms that are mostly white. (the wire is quite different to regular automotive wire) Quote Link to comment Share on other sites More sharing options...
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