Exhaust Oxygen

-02 Sensor

Major Inputs Affecting Fuel and Spark

These six sensor inputs account for practically 100% of the fuel and spark calculation.

Fig. 5-39


Step 1

Manifold Pressure Sensor



—> —>

Basic Injection Duration Determined





Step 2

Corrected Injection Duration Determined

(Basic Injection Duration Correction)

Intake Air Temp. Sensor

Intake Air Temperature Correction

Warm-up Enrichment

After-Start Enrichment

Power Enrichment

Air/Fuel Ratio Feedback Correction

Water Temp. Sensor

Throttle Position Sensor


Oxygen Sensor


Step 3

Final Injection Signal Determined (Voltage Correction)

Battery Voltage


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