I had an engine light and VSC message come up on my 2009 Toyota verso 2.0 d4d diesel 1AD-FTV. When I checked fault codes it was p1271 which, according to the web relates to the scv suction control valve and its driver and circuit. I got a replacement used edu injector driver unit 89871-20080 13100-1562 from eBay which solved the issue

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