Powertrain Control Module (Pcm)

The PCM is located next to the washer solvent reservoir. The PCM receives input signals from various switches and sensors. Based on these inputs the PCM manages the cooling fan activation and speed selection by sending a desired Pulse Width Modulated (PWM) duty cycle (%) at a specified frequency (Hz) to the radiator fan. The PCM controls activation and deactivation of cooling fan to protect the engine from being overheated. During the fan activation, speed selection and deactivation of the radiator fan is based on the value of engine thermal variables that the PCM continuously monitors through direct equipped sensors, estimated algorithms, or it could be through request via Controller Area Network-Chassis (CAN-C) Controller Area Network-Electronic Powertrain (CAN-EPT).

CAN-C Inputs

• Electronic Climate Control (ECC)/Heating, Ventilation, & Air Conditioning (HVAC) request.
• A/C refrigerant pressure sensor information.
• Engine oil temperature.
• Engine coolant temperature.
• Engine RPM.
• Engine run status.
• Intake air temperature.
• Engine thermal management demand.
• Vehicle speed.
• Commanded ignition switch status.
• Hood ajar status.
• Ambient temp sensor voltage.
• Maximum A/C demand to powertrain.
• Transmission fluid temperature.

CAN-C Outputs

• Radiator fan PWM duty cycle command.

CAN-EPT Inputs

• Air flow request.

CAN-EPT Outputs

• Radiator fan request.

Hardwire Outputs

• PWM command signal to the radiator cooling fan.