Circuit Description

Fuel delivery system will operate in open loop when engine coolant temperature is less than 68°F (20°C). During open loop, PCM ignores oxygen sensor signal and calculates air/fuel ratio based on inputs from Engine Coolant Temperature (ECT) sensor, Throttle Position (TP) sensor and Manifold Absolute Pressure (MAP) sensor.

Conditions for setting this DTC are as follows:

• ECT sensor is less than 140°F (60°C).
• IAT sensor is greater than 68°F (20°C).
• Vehicle speed is greater than 5 MPH.
• Engine run time is greater than 6 minutes.