The Engine Control Module (ECM) uses values from the Intake Air Temperature (IAT), Intake Manifold Pressure (IMP) and compressor efficiency to calculate the Compressor Discharge Temperature.
Conditions for diagnostic trouble code (DTC):
1) The calculated charge air temperature output from the turbo is too high
1) Engine de-rated
1) High ambient temperature
2) Low air pressure
3) A leak in the turbocharger inlet pipe can cause hot air to be sucked into the inlet system
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