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Home >> Chevrolet >> 2011 >> Chevy Express G2500, Van Cargo Extended, 6.6 L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.6L (LGH) - DTC P0016 Through DTC P11DC >> Diagnostic Information and Procedures >> DTC P111D >> Code Description >> Circuit/System Description

Circuit/System Description

The fuel temperature sensor 2 and intake air temperature (IAT) sensor 1 are variable resistors. The fuel temperature sensor 2 is located at the fuel rail and the IAT Sensor 1 is part of the mass air flow intake air temperature (MAF/IAT) sensor assembly. The engine control module (ECM) supplies 5 V to the signal circuits, and a ground for each sensor's low reference circuit. The ECM monitors the and Fuel Temperature Sensor 2 and IAT Sensor 1 circuits in order to calculate the temperature of the fuel and air. The ECM monitors the Fuel Temperature Sensor 2 and IAT Sensor 1 signals for excessively high or low voltages, or for a voltage that is not in correlation with the other sensor's start up signal.

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