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• Manifold Absolute Pressure (MAP) Sensor • Oxygen Sensor • SCI Receive • Speed Control System Controls • Throttle Position Sensor • Vehicle Speed Sensor PCM Outputs: • Air Conditioning Clutch Relay • Generator Field • Idle Air Control Motor • Auto Shutdown (ASD) Relay • Barometric Read Solenoid • Canister Purge Solenoid • Malfunction Indicator Lamp (Check Engine Lamp) • Data Link Connector • Fuel Injectors • Ignition Coil • Radiator Fan Relay • Speed Control Solenoids • Tachometer Output • Wastegate Solenoid Based on inputs it receives, the PCM adjusts fuel injector pulse width, idle speed, ignition spark ad- The PCM adjusts injector pulse width (air-fuel ra- tio) based on the following inputs. • engine coolant temperature • exhaust gas content • engine speed (crankshaft position sensor) • manifold absolute pressure • throttle position The PCM adjusts ignition timing based on the fol- lowing inputs. • knock sensor • engine speed (crankshaft position sensor) • manifold absolute pressure • throttle position The Automatic Shut Down (ASD) and Fuel Pump relays are mounted externally, but turned on and off The camshaft position sensor and crankshaft posi- tion sensor signals are sent to the PCM. If the PCM The PCM contains a voltage converter that changes battery voltage to a regulated 8.0 volts. The shaft position sensor and vehicle speed sensor. The AIR CONDITIONING SWITCH SENSE—PCM INPUT When the air conditioning or defrost switch is put in the ON position and the low pressure and high BATTERY VOLTAGE—PCM INPUT The PCM monitors the battery voltage input to de- termine fuel injector pulse width and generator field BRAKE SWITCH—PCM INPUT When the brake switch is activated, the PCM re- ceives an input indicating that the brakes are being CAMSHAFT POSITION SENSOR—PCM INPUT Fuel injection synchronization and cylinder identi- fication are provided through the camshaft position Fig. 3 Camshaft Sensor Ä FUEL SYSTEMS 14 - 85 |