snuf Posted November 25, 2016 Share Posted November 25, 2016 I need a ecu for my uk spec. tt automatic. Ecu does work but "check engine light " will not light up from Ecu Ecu no 89661-14661 Thanks in advance Link to comment Share on other sites More sharing options...
Wez Posted November 25, 2016 Share Posted November 25, 2016 Have you checked wiring to check light, maybe its been disabled by a previous owner. Link to comment Share on other sites More sharing options...
snuf Posted November 25, 2016 Author Share Posted November 25, 2016 Hi It use to work up to about 6 months ago then it became intermittent and finally total failure. The light works when earthing the input pin at the Ecu proving the lamp circuit is ok. I did read that the immobiliser can cause this but I can't see any connection from the immobiliser Ecu to engine Ecu on the circuit schematic. Link to comment Share on other sites More sharing options...
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