Neon L4-2.0L SOHC (1995)
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Air Conditioning WOT Relay
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Auto Shutdown (ASD) Relay
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Charging Indicator Lamp
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Data Link Connector
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Duty Cycle EVAP Canister Purge Solenoid
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EGR Solenoid
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Fuel Injectors
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Fuel Pump Relay
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Generator Field
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Idle Air Control Motor
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Ignition Coils
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Malfunction Indicator (Check Engine) Lamp
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Radiator Fan Relay
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Speed Control Solenoids
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Tachometer
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Torque Convertor Clutch Solenoid
Based on inputs it receives, the PCM adjusts:
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Fuel Injector Pulse Width
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Idle Speed
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Ignition Spark Advance
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Ignition Coil Dwell
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EVAP Canister Purge Operation.
The PCM Regulates:
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Cooling Fan
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Air Conditioning
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Speed Control System
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Generator Charge Rate -- by Adjusting The Generator Field
The PCM Also Performs Diagnostics
The PCM adjusts injector pulse width (air-fuel ratio) based on:
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Battery Voltage
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Coolant Temperature
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Exhaust Gas Content (Oxygen Sensor)
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Engine Speed (Crankshaft Position Sensor)
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Intake Air Temperature
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Manifold Absolute Pressure
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Throttle Position
The PCM adjusts ignition timing based on:
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Coolant Temperature
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Engine Speed (Crankshaft Position Sensor)
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Intake Air Temperature
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Knock Sensor
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Manifold Absolute Pressure
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Throttle Position
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Transmission Gear Selection (Park/Neutral Switch)
The PCM also adjusts engine idle speed through the idle air control motor based on:
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Air Conditioning Sense
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Battery Temperature
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Battery Voltage
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Brake Switch
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Coolant Temperature
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Engine Speed (crankshaft Position Sensor)
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Engine Run Time
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Manifold Absolute Pressure
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Power Steering Pressure Switch
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Throttle Position
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Transmission Gear Selection (Park/Neutral Switch)
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Vehicle Distance (Speed)
ASD and Fuel Pump Relay Control
The Auto Shutdown (ASD) and fuel pump relays are mounted externally, but turned on and off by the PCM.