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Home >> Chrysler >> 2007 >> Crossfire Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Electronic Control Modules (Service Information)) >> Electronic Control Modules - Service Information >> Module-Powertrain Control >> Operation >> Powertrain Control Module >> PCM Outputs

PCM Outputs

WARNING: This page is about a different car, the 2007 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

Based on inputs it receives, the PCM adjusts fuel injector pulse width, idle speed, ignition spark advance, ignition coil dwell and EVAP canister purge operation. The PCM also determines the appropriate transmission shift schedule and shift points, depending on the present operating conditions and driver demand. The PCM regulates the cooling fan, air conditioning and speed control systems. The PCM changes generator charge rate by adjusting the generator field. The PCM also performs diagnostics.

The PCM adjusts injector pulse width (air-fuel ratio) based on the following inputs.

  1. Battery voltage
  2. Coolant temperature
  3. Exhaust gas content (oxygen sensor)
  4. Engine speed (crankshaft position sensor)
  5. Intake air temperature
  6. Manifold absolute pressure
  7. Throttle position

The PCM adjusts ignition timing, intake manifold runner position, and variable valve timing based on the following inputs.

  1. Coolant temperature
  2. Engine speed (crankshaft position sensor)
  3. Knock sensors
  4. Manifold absolute pressure
  5. Throttle position
  6. Transmission gear selection (park/neutral switch)
  7. Intake air temperature

The PCM also adjusts engine idle speed through the idle air control motor based on the following inputs.

  1. Air conditioning sense
  2. Battery voltage
  3. Brake switch
  4. Coolant temperature
  5. Engine speed (crankshaft position sensor)
  6. Engine run time
  7. Manifold absolute pressure
  8. Throttle position
  9. Transmission gear selection (park/neutral switch)

The camshaft position sensor and crankshaft position sensor signals are sent to the PCM. If the PCM does not receive the signal within approximately 1 second of engine cranking, it deactivates the fuel pump. When these are deactivated, power is shut off to the fuel injectors, ignition coils, oxygen sensor heating elements and fuel pump.

The PCM contains a voltage converter that changes battery voltage to a regulated 5 volts direct current to power the camshaft position sensor, crankshaft position sensor, manifold absolute pressure sensor, throttle position sensor, A/C pressure switch, A/C pressure transducer, and vehicle speed sensor.

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