Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
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 preset in PCM, but are variable and determined by climatic conditions as follows:
- ECT sensor is less than preset temperature condition.
- IAT sensor is greater than preset temperature condition.
- Engine run time exceeds predetermined minimum.
- System in "open-loop".