Hey Hkp7 - The Aux Air Valve is electrically in parallel with the Fuel Pump. Both the AAV and Fuel Pump receive their power at the same time from the Fuel Pump Relay (XVII). The Cold Start Fuel Injector only receives +12v when the starter is being applied. The Cold Start Fuel Injector ground is through the Cold Start Temperature Switch on the very front of the Thermostat housing. If during the start mode and the engine water temp is warm - the Cold Start Fuel Injector receives +12v power but no ground is available.
On top of the Thermostat housing (toward front) the Fuel Injection Computer Engine Temp Sensor (Temp II) is used to determine the engine water temp for the Fuel Injection pulse width calculations – and – (toward rear) a dual element temp sensor is located for the Over Temp Warning Light (small prong) / Temperature Gauge (larger prong).
Hope this help,
Michael
