Powertrain Control Module (Pcm)
| Refer to COMPONENT INDEX . |
The PCM is located next to the washer solvent reservoir. The PCM is a digital computer containing a microcontroller. The PCM receives input signals from various switches and sensors that are referred to as PCM Inputs. Based on these inputs, the PCM adjusts various engine and vehicle operations through devices that are referred to as PCM Outputs.
The PCM is powered by a fuse located in the PDC. The PCM uses the Controller Area Network-Chassis (CAN-C) bus to perform engine diagnostics and flash operations.
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 been over heated. 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).
The PCM is powered by a fuse located in the PDC.
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 temp
- 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