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

Fig. 13a, Oxygen sensor & charge temperature switch locations. 6 cylinder engines.:

The CTS, Fig. 13A, is used on six cylinder engines only 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 and 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.