Filed Under (Hyundai) by admin on 07-09-2010
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P1128 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 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 to 10% to 15% lean for 30 seconds during two driving cycles when the following conditions are met: 1. Engine load exceeds 1.8 milliseconds. 2. Engine coolant temperature is above 158 °F (70 °C). 3. Canister purge system is not operating. 4. Mass air flow is less than or 5.5 g/s. 5. Engine speed is below 1000 RPM.
