DTC | Diagnostic item |
P1123 P1124 P1127 P1128 | Fuel Trim Additive Air System Too Rich Fuel Trim Additive Air System Too Lean Long Term Fuel Trim Multipicative System Too Rich Long Term Fuel Trim Multipicative System Too Lean |
Intake air system.
Exhaust system.
Evaporative emissions control system (includes purge control solenoid valve).
Fuel injectors.
Fuel pressure regulator.
Fuel pump.
ECM is in closed loop operation.
Engine speed is below 1000 RPM.
Engine coolant temperature is above 158°F (70°C).
Canister purge system is not operating.
Mass air flow is less than 7.5 g/s [for P1123] or 5.5 g/s [for P1124].
Engine load exceeds 1.8 milliseconds.
ECM is in closed loop operation [for P1127].
Engine coolant temperature is above 158°F (70°C).
Canister purge system is not operating.
Mass air flow is less than or 5.5 g/s.
Engine speed is below 1000 RPM [for P1128].
