Powertrain Control Module

The Powertrain Control Module (PCM) is installed in the rear left corner of the engine compartment, behind the secondary bulkhead panel. The PCM is attached to brackets on the wheel housing and the fender outer support panel.

The PCM connected to the vehicle harnesses via two connectors. The PCM contains data processors and memory microchips. The output signals to the actuators are in the form of ground paths provided by driver circuits within the PCM. Some sensors receive a regulated voltage supplied by the PCM. This avoids incorrect signals caused by voltage drop during cranking.

The PCM is connected to the engine sensors which allow it to monitor the engine operating conditions. The PCM processes these signals and decides the actions necessary to maintain optimum engine performance in terms of driveability, fuel efficiency and exhaust emissions. The memory of the PCM is programmed with instructions for how to control the engine. The memory also contains data in the form of maps which the PCM uses as a basis for fueling and emission control. By comparing the information from the sensors to the data in the maps, the PCM is able to calculate the various output requirements. The PCM contains an adaptive strategy which updates the system when components vary due to production tolerances or ageing.

The PCM is connected to other system control modules and receives data from these modules on the FlexRay bus system and the High Speed (HS) Controller Area Network (CAN) chassis systems bus to enable precise engine control under all vehicle operating conditions.

The PCM receives and processes information from the following input sources:

• Crankshaft Position (CKP) sensor
• Camshaft Position (CMP) sensor
• Mass Air Flow and Temperature (MAFT) sensor
• Manifold Absolute Pressure (MAP) sensor
• Throttle Position Sensor (TPS)
• Engine Coolant Temperature (ECT) sensor
• Cylinder head temperature sensor
• Accelerator Pedal Position (APP) sensor
• Charge air temperature sensor
• Ambient Air Temperature (AAT) sensor
• Heated Oxygen Sensor (HO2S)
• Oil pressure switch
• Variable Geometry Turbocharger (VGT) vane position sensor
• Oil level and temperature sensor
• Active grille air shutter motor - if equipped
• Transmission Control Switch (TCS)
• Transmission Control Module (TCM)
• Terrain Response (TR) switchpack
• Exhaust pressure control valve - Position sensor - if equipped
• Diesel Exhaust Fluid (DEF) tank module
• DEF heater control unit
• Water In Fuel (WIF) sensor
• Automatic Temperature Control Module (ATCM)
• Restraints Control Module (RCM).
• The following brake system components:
  • Anti-lock Brake System (ABS) control module
  • Brake pedal switch
  • Brake vacuum sensor (Stop/start system vehicles only).
• The following fuel system components:
  • Fuel Rail Pressure (FRP) sensor
  • Fuel temperature sensor.
• The following Exhaust Gas Recirculation (EGR) system components:
  • EGR valve - High Pressure (HP)
  • EGR valve - Low Pressure (LP) - All markets, except EU4
  • LP EGR outlet temperature sensor - All markets, except EU4
  • LP EGR differential pressure sensor - All markets, except EU4.
• The following catalytic converter and Diesel Particulate Filter (DPF) system components:
  • Pre Selective Catalyst Reduction (SCR) Nitrogen Oxide (NOx) sensor - North America Specification market vehicles only
  • Post Selective Catalyst Reduction (SCR) NOx sensor
  • Post Selective Catalyst Reduction (SCR) soot sensor - North America Specification market vehicles only
  • Differential pressure sensor
  • DPF inlet temperature sensor
  • DPF outlet temperature sensor

The PCM outputs controlling signals to the following sensors and actuators:

• Throttle actuator
• Oil pump control solenoid
• PCM cooling fan - if equipped
• Diesel Exhaust Fluid (DEF) tank module
• DEF heater control unit
• DEF Injector
• Glow plug control module
• Transmission Control Switch (TCS)
• Automatic Temperature Control Module (ATCM)
• Anti-lock Braking System (ABS) control module
• Active engine mount solenoid
• Variable Geometry Turbocharger (VGT) vane actuator
• Transmission Control Module (TCM)
• Instrument Cluster (IC)
• Exhaust pressure control valve actuator - if equipped.
• The following cooling system components:
  • Variable coolant pump
  • Engine cooling fan control modules
  • Active grille air shutter motor - if equipped
  • Charge air coolant pump.
• The following fuel system actuators:
  • Fuel injector - 6 off
  • Fuel pressure control valve
  • Fuel metering valve.
• The following Exhaust Gas Recirculation (EGR) system components:
  • EGR cooler bypass valve solenoid
  • EGR High Pressure (HP) valve motor
  • EGR Low Pressure (LP) valve motor - All markets, except EU4.