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

[FOR SHORT-TERM FUEL TRIM]
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 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 air flow is less than or 6.6 g/s.

[FOR LONG-TERM FUEL TRIM]
The ECM will set a code and the Malfunction Indicator Lamp (MIL) will turn on if the long-term fuel trim value goes 10 % to 15 % rich [for P1127] or lean [for P1128] for 30 seconds during two driving cycles when the following conditions are met:
1. Engine load exceeds 2.0 milliseconds.
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 air flow is less than or 5.5 g/s.

Test Procedure (Part 1 Of 2):

Test Procedure (Part 2 Of 2):

TEST PROCEDURE