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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 P040F >> Code Description >> Circuit/System Description

Circuit/System Description

The exhaust gas recirculation (EGR) temperature sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. The engine control module (ECM) supplies 5 volts to the temperature sensor signal circuit and a ground for the low reference circuit. The ECM uses this rationality diagnostic to determine if the input from EGR temperature sensor 1 or EGR temperature sensor 2 is skewed. The ECM will compare the temperature difference between EGR temperature sensor 1 and the EGR temperature sensor 2 to determine if the temperatures are within an acceptable operating range of each other.

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