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The ambient air temperature signal is sent to the instrument cluster module. The instrument cluster module then transmits the ambient air temperature data to the Engine Control Module (ECM) via the J1939 data lines.
Conditions for diagnostic trouble code (DTC):
1) Implausible sensor signal
2) Ambient air temperature sensor
3) Charge air temperature sensor
Probable cause
1) Ambient air temperature sensor
2) Charge air temperature sensor