P2199

DTC P2199 Intake Air Temperature Sensor 1 - 2 Correlation

Circuit Description

The intake air temperature (IAT) sensor 1 is fitted between the air cleaner and turbocharger. It is internal to the mass air flow (MAF) sensor and measures the temperature of the air entering the engine. The IAT sensor 2 is installed to the intake manifold and measures the temperature of the air entering the engine that mixed with EGR gas. The ECM monitors difference of temperature from both sensor inputs continuously. If the ECM detects that difference of temperature between both inputs are more than a calculated value this DTC will set.

Condition for Running the DTC

^ DTCs P0097 P0098 P0112 P0113 P0116 P0117 P0118 P0237 P0238 P0405 P0406 P042E P0642 P0643 P0652 P0653 P2228 and P2229 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
^ The engine runtime is between 30 to 1800 seconds.
^ The engine coolant is between 19 to 131°F (-7 to 55°C).
^ The relative boost pressure is less than 4.4 psi (30 kPa).
^ The EGR valve position is less than 3%.
AND either of following condition is met for longer than 5 seconds.
^ The engine coolant temperature is less than 90°F (32°C) during engine warm up control.
^ The exhaust brake valve is commanded OFF.

Condition for Setting the DTC

^ The ECM detects that the intake air temperature 2 is more than 100°F (38°C) over the intake air temperature 1 for longer than 8 seconds.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type B.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type B.

Diagnostic Aids

^ Before starting a cold engine Intake Air Temperature 1 and 2 should be relatively close to each other.
^ If an intermittent condition is suspected refer to Intermittent Conditions in this section. Use the Temperature vs. Resistance table to test the IAT sensor 1 or 2 at various temperature levels to evaluate the possibility of a skewed sensor.
^ A sticking or intermittently sticking the EGR valve may set this DTC.
^ Skewed engine coolant temperature sensor or skewed boost pressure sensor may set this DTC.

Circuit/System Testing DTC P2199