Powertrain Control Module
The PCM is located in the rear left corner of the engine compartment.
The PCM receives inputs from various sensors and output reference voltages and signal information to other sensors for engine control.
The PCM receives inputs from the following:
- The Integrated Power Brake control module
- CKP
- CMP (quantity 2)
- Brake pedal switch
- TCM
- TCS
- Ambient Air Temperature (AAT) sensor
- Engine Coolant Temperature (ECT) sensor - Radiator outlet
- ECT sensor - Cylinder block outlet
- Electric cooling fan control module
- HO2S (quantity 3)
- Exhaust back pressure sensor (if equipped)
- Mass Air Flow (MAF) sensor
- MAFT sensor
- Charge air temperature sensor
- Charge air pressure sensor
- Charge air pressure and temperature sensor
- Electric throttle - Throttle Position Sensor (TPS)
- Cylinder head temperature sensor
- Cylinder block temperature sensor
- Knock sensor (quantity 3)
- Oil pressure and temperature sensor
- Variable coolant pump - Shroud position sensor
- MAPT
- Continuous Variable Valve Lift (CVVL) assembly temperature sensor
- FRPT sensor
- APP sensor.
The PCM provides outputs to the following:
- Electric throttle
- Fuel injector (quantity 6)
- Ignition coil (quantity 6)
- VCT solenoid (quantity 2)
- Purge valve
- Purge valve pressure sensor
- Electric cooling fan control module
- Viscous cooling fan control module
- Charge air coolant pump
- HP fuel pump
- FPDM
- Compressor Recirculation Valve (CRV)
- Turbocharger wastegate actuator
- Electric supercharger
- Electric supercharger bypass valve
- Oil pump control solenoid
- Heater element - Electric thermostat housing
- Auxiliary coolant pump
- DMTL (North American Specification (NAS) market vehicles only)
- Variable coolant pump
- Piston cooling oil jet solenoid
- CVVL solenoid (quantity 6)
- Active grille air shutter motor (if equipped).
The PCM is connected to the vehicle harnesses through 6 connectors. The PCM contains data processors and memory microchips. The output signals to the actuators and sensors are in the form of ground paths provided by driver circuits within the PCM . The PCM driver circuits produce heat during normal operation. Cooling for the PCM is provided by a ribbed casing and a cooling fan assembly.
The PCM performs self-diagnostic routines and stores Diagnostic Trouble Code(s) (DTC) in its memory. These DTC and diagnostics can be accessed using a Jaguar Land Rover (JLR) approved diagnostic equipment. If the PCM is to be replaced, the new PCM is supplied 'blank' and must be configured to the vehicle using a JLR approved diagnostic equipment. A 'flash' electrically erasable programmable read only memory allows the PCM to be externally configured, with market specific or new tune information. The current engine tune data can be accessed and read using a JLR approved diagnostic equipment.
When a new PCM is installed, it must be synchronized to the BCM /GWM using a JLR approved diagnostic equipment. The PCM s cannot be 'swapped' between vehicles.
The PCM is connected to the engine sensors which allow it to monitor the engine operating conditions. The PCM processes these signals and determines the actions necessary to maintain optimum engine performance in terms of driveability, fuel efficiency and exhaust emissions. The memory of the PCM is programed with instructions for how to control the engine, this is known as the strategy. 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.
Some sensors receive a regulated voltage supplied by the PCM . This avoids incorrect signals caused by voltage drop during cranking.
The BCM /GWM receives a vehicle speed signal on the FlexRay systems bus from the Integrated Power Brake control module. The BCM /GWM provides the vehicle speed signal to the PCM on the FlexRay systems bus. Vehicle speed is an important input to the PCM strategies. The Integrated Power Brake control module derives the speed signal from the wheel speed sensors. The frequency of this signal changes according to road speed.
The PCM uses this signal to determine the following:
- When to permit speed control operation.
- To control the operation of the speed control system.
- Implementation of the idle strategy when the vehicle is stationary.