Could be anything. Resistors usually fail 'open'; semiconductors fail 'closed' or go toasty until they are 'open', letting out the magic smoke that makes them work.

All kidding aside, visual inspection might reveal a tell-tale brown spot on the circuit board.


-Bill
'87 4Runner w/ '96 5VZ-FE, 'Red Chili II'
'97 Taco XtraCab 3RZ-FE, 'BlackBean'
TLCA # 13257, Rising Sun 4x4 Club Land Use Coordinator
"He who stops being better stops being good." -Oliver Cromwell