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the diagram is for the Si/HF 8-wire connector at the driver's side - don't know what you mean by small plug - it is smaller than the DPFI 14 wire plugis that diagram for the small plug
the Fast Idle Control Valve is only found on the 89-91 (not on 88) Si D16A6, on the back of the intake manifoldwhere is the fast idle valve located
the TPS connector is a 3-wire connector with yellow/white, red/blue and green/white wiresand another thing is the tps sensor a 3 pin plug
EACV, yes - to the right of the FICV in the picture - has 2-wire connector with blue/yellow and black/yellow wiresso on the d16a6 manifold it would be closer to the t/b right