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

ECU

Step 1

Manifold Pressure Sensor

—i

i—

—> —>

Basic Injection Duration Determined

Distributor

»

—>

U

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

U

Step 3

Final Injection Signal Determined (Voltage Correction)

Battery Voltage

____________II____________

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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