Air Temperature Sensor ( Ambient / Intake ): Description and Operation

Fig. 14 Charge temperature switch location. V6-238 engine:

The CTS, Fig. 14, is used on six cylinder engines and is located in the intake manifold No. 6 branch runner on six cylinder engines. When the incoming air fuel mixture is below 60° F., the CTS will close, allowing no EGR timer function, no EGR valve operation. When incoming air-fuel mixture is above 60° F., the CTS will open allowing EGR timer to expire, and the EGR valve to operate.