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Powertrain Control Module (Pcm)

  1. Also refer to Modes of Operation.

    2. The PCM operates the fuel system. The PCM is a pre-programmed, triple microprocessor digital computer. It regulates ignition timing, air-fuel ratio, emission control devices, charging system, certain transmission features, speed control, air conditioning compressor clutch engagement and idle speed. The PCM can adapt its programming to meet changing operating conditions.

    The PCM receives input signals from various switches and sensors. Based on these inputs, the PCM regulates various engine and vehicle operations through different system components. These components are referred to as Powertrain Control Module (PCM) Outputs. The sensors and switches that provide inputs to the PCM are considered Powertrain Control Module (PCM) Inputs.

    The PCM adjusts ignition timing based upon inputs it receives from sensors that react to: engine RPM, manifold absolute pressure, engine coolant temperature, throttle position, transmission gear selection (automatic transmission), vehicle speed and the brake switch.

    The PCM adjusts idle speed based on inputs it receives from sensors that react to: throttle position, vehicle speed, transmission gear selection, engine coolant temperature and from inputs it receives from the air conditioning clutch switch and brake switch.

    Based on inputs that it receives, the PCM adjusts ignition coil dwell. The PCM also adjusts the generator charge rate through control of the generator field and provides speed control operation.

NOTE: PCM Inputs:
  1. A/C request
  2. Auto shutdown (ASD) sense
  3. Battery temperature
  4. Battery voltage
  5. Brake switch
  6. Camshaft position sensor signal
  7. Crankshaft position sensor
  8. Data link connections for scan tool
  9. Engine coolant temperature sensor
  10. Five volts (primary)
  11. Five volts (secondary)
  12. Fuel level
  13. Generator (battery voltage) output
  14. Ignition circuit sense (ignition switch in on/off/crank/run position)
  15. Intake manifold air temperature sensor
  16. Leak detection pump (switch) sense (if equipped)
  17. Manifold absolute pressure (MAP) sensor
  18. Oil pressure
  19. Overdrive/override switch
  20. Oxygen sensors
  21. Park/neutral switch (auto. trans. only)
  22. Power ground
  23. Sensor return
  24. Signal ground
  25. Speed control multiplexed single wire input
  26. Throttle position sensor
  27. Transmission governor pressure sensor
  28. Transmission temperature sensor
  29. Vehicle speed (from ABS module)
NOTE: PCM Outputs:
  1. A/C clutch relay
  2. Auto shutdown (ASD) relay
  3. circuits for: speedometer, voltmeter, fuel gauge, oil pressure gauge/lamp, engine temp. gauge and speed control warn. lamp
  4. Data link connection for scan tool
  5. EGR valve control solenoid (if equipped)
  6. EVAP canister purge solenoid
  7. Fuel injectors
  8. Fuel pump relay
  9. Generator field driver (-)
  10. Generator field driver (+)
  11. Generator lamp (if equipped)
  12. Ignition coil
  13. Natural Vacuum Leak detection Switch
  14. Malfunction indicator lamp (Check engine lamp). Driven through Bus Messages.
  15. Overdrive indicator lamp (if equipped). Driven through Bus Messages.
  16. Oxygen sensor heater relays (if equipped).
  17. Radiator cooling fan relay (pulse width modulated)
  18. Speed control source
  19. Speed control vacuum solenoid
  20. Speed control vent solenoid
  21. Tachometer (if equipped). Driven through Bus Messages.
  22. Transmission convertor clutch circuit
  23. Transmission 3-4 shift solenoid
  24. Transmission relay
  25. Transmission temperature lamp (if equipped)
  26. Transmission variable force solenoid
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