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5-1-2 Short Term Fuel Trim (Integrator), Lower Limit
Condition(s) for DTC
The short term fuel trim value is a measure of degree to which the injection period in the basic MFI module program must be varied to ensure that the engine is supplied with the optimum air/fuel mixture. This optimum mixture corresponds to a value of Lambda = 1 . If the engine is running rich, the short term fuel trim will reduce the injection period to restore the optimum mixture. A DTC will be recorded if the engine runs so rich that the short term fuel trim reaches its lower limit and remains there for 166 seconds .
Fault source(s)
Heated Oxygen Sensor (HO2S ) signal lead short-circuited to ground.
HO2S faulty.
Contact resistance and oxidation in Mass Air Flow (MAF) sensor connector.
MAF sensor faulty.