2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1761
Circuit/System Description
The intake air temperature (IAT) sensor, a part of the mass air flow (MAF) sensor assembly, is a variable resistor. The IAT sensor has a signal
circuit and a low reference circuit. The IAT sensor measures the temperature of the air entering the engine. The engine control module (ECM)
supplies 5 V to the IAT signal circuit, and a ground for the IAT low reference circuit.
Conditions for Running the DTC
P0112
* DTCs P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The engine coolant temperature (ECT) is colder than 150掳C (302掳F).
* This DTC runs continuously when the above conditions are met.
P0113
* DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0125, P0128, P0722, P0723 are not set.
* The engine is running for greater than 10 s.
* The ECT is warmer than -40掳C (-40掳F).
* The MAF Sensor signal is equal to or greater than 512 g/s.
* This DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0112
The ECM detects that the IAT sensor signal is warmer than 149掳C (300掳F) for greater than 5 s.
P0113
The ECM detects that the IAT sensor signal is colder than -39掳C (-38掳F) for greater than 5 s.
Action Taken When the DTC Sets
DTCs P0112 and P0113 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0112 and P0113 are Type B DTCs.
Diagnostic Aids
* With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT
Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
* Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit
can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
* An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
