Component Description-engine operation 5-

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Component Description
Powertrain Control Module (PCM)




The PCM optimizes engine power and emissions at all times by processing the sensor signals and information received via the CAN databus and using these for open or closed loop control of the different variables.
The PCM contains part of the PATS.

The PCM is supplied with battery power via fuse F10 in the BJB (battery junction box). This power supply is needed to ensure that saved data is not lost when the engine is switched off. After the engine has been switched off, the PCM continues to be supplied with power for a further 10 seconds to allow data from RAM (random access memory) of the PCM to be written to non-volatile memory.
A voltage transformer integrated into the PCM provides various components of the PCM and sensors on the engine with a 5 volt supply. Functions which work at battery voltage, such as the injectors, are controlled via internal power end stages or, like the ignition coil, via an external power end stage in the ignition coil itself.
To guarantee optimum engine running at all times, the PCM has several adaptive (self-learning) functions. These adapt the output signals to changing circumstances, such as wear or system faults.

In some cases a faulty signal is also replaced with a substitute value or limited. A substitute value can be calculated from other signals or it can be predefined by the PCM. The substitute value allows the vehicle to keep on running without the emission values changing unduly. Depending on the signal failure, the PCM operates in emergency mode. In this mode, the engine power and/or the engine speed is reduced to prevent further damage.
Depending on the faulty signal, a fault code is stored in the error memory of the PCM.
The PCM processes signals from different sensors and evaluates these with internal software. The following sensors send signals to the PCM:
  • CMP sensors
  • CKP sensor
  • MAF sensor
  • KS
  • ECT sensor
  • EOP switches
  • TP (throttle position) sensor
  • APP sensor
  • HO2S
  • Catalyst monitor sensor
  • IAT sensor
  • PSP switches
  • Air conditioning (A/C) pressure sensor
  • Alternator
The following components receive signals from the PCM:
  • Powertrain Control Module relay
  • A/C clutch relay
  • Injectors
  • EI ignition coil
  • Cooling fan module
  • Throttle control unit
  • {Acronym.VVT} solenoids
  • Starter relay
  • EVAP purge valve
  • Alternator
  • HO2S heating element
  • Catalyst monitor sensor heating element
The PCM receives the following signals via the CAN databus:
  • Outside air temperature
  • APP
  • CPP
  • BPP
  • Vehicle speed
  • Query for A/C compressor
  • PATS
The PCM sends the following signals via the CAN databus:
  • Fuel pump relay on/off
  • Engine speed
  • Warning lamps on/off
  • PATS
  • ECT

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