P1124

DESCRIPTION
The air/fuel control system, in addition to a number of sensors, includes the following components and systems:

- Intake air system.
- Exhaust system.
- Evaporative emissions control system (includes purge control solenoid valve). Fuel injectors.
- Fuel pressure regulator.
- Fuel pump.

For the air/fuel ratio to be within limits, all of the sensors, components and systems associated with the air/fuel control system must function within normal parameters.

FAILURE CONDITIONS
The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if the short-term fuel trim value goes 10% to 15% rich [for P1123] or if the short-term fuel trim additive value is less than 0.4 milliseconds, or 10% to 15% lean [for P1124] for 30 seconds during two driving cycles when the following conditions are met:

1. ECM is in closed loop operation.
2. Engine speed is below 1000 RPM.
3. Engine coolant temperature is above 158 °F (70 °C).
4. Canister purge system is not operating.
5. Mass airflow is less than 7.5 g/s [for P1123] or 5.5 g/s [for P1124].

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TEST PROCEDURE