Pressure Switch

Two positive pressure switches, which are combinations of a pressure withstanding diaphragm and microswitch, are mounted in front of the body strut mount. One switch operates when intake manifold pressure reaches 2 in. Hg. This causes the turbo indicator light to illuminate, indicating that the turbocharger has begun its super-charging operation.

At the same time, it also transmits heavy load signal to the control unit for canceling air/fuel ratio feedback control. The other switch operates at a pressure of 18 in. Hg for cutting off fuel when an abnormal rise in supercharging pressure occurs, due to a failed turbocharger wastegate or other fault, thereby preventing damage to the engine.