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ECM Operating Conditions Sensed (Inputs)

A/C "ON" or "OFF"
Engine Coolant Temperature
Ambient Temperature
Barometric Press. (BARO)
Brake "ON" or "OFF"
Cruise Control "ON" or "OFF"
Differential Press. (Eng. Vacuum)
Distributor Reference
Crankshaft Position
Engine Speed
EGR Vacuum
Engine Cranking
Engine Detonation (ESC)
Exhaust Oxygen (O2)
Manifold Absolute Press. (MAP)
Mass AirFlow (MAF)
Manifold Air Temperature (MAF)
Park/Neutral Sw. Position (P/N)
System Voltage
Throttle Position (TPS)
Transmission Gear Position
Vehicle Speed (VSS)

Fig 1: Schematic of Computer Command Control System

G6686

Fig 2: Sectional View of Mixture Control Solenoid. Note air bleed above main metering rod.

G9276