Open Loop Control

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During open loop control, the air/fuel ratio is determined by the ECC control unit. For improved driveability, air/fuel ratio solenoid is controlled by open loop control under the following conditions:

When battery voltage is below 10 volts.
When starting engine and cranking speed is below 400 RPM.
When engine coolant temperature is below 122°F (50°C) on manual transmission models or 140°F (60°C) on automatic transmission models.
When exhaust gas sensor is not activated.
When driving at high speeds (above 3425 RPM for California models or above 4150 RPM for Federal models).