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                                                                                                                                       DI-59
                                                   DIAGNOSTICS       -   ENGINE
                                                                                                                                        DI6V7-04




     DTC                P0171                System too Lean (Fuel Trim)

CIRCUIT DESCRIPTION
Fuel trim refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short-term fuel trim and long-term fuel trim.
Short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal
theoretical value. The signal from the oxygen sensor indicates whether the air-fuel ratio is RICH or LEAN
compared to the ideal theoretical value, triggering a reduction in fuel volume if the air-fuel ratio is rich, and
an increase in fuel volume if it is lean.
Long-term fuel trim is overall fuel compensation carried out long-term to compensate for continual deviation
of the short-term fuel trim from the central value due to individual engine differences, wear over time and
changes in the usage environment.
If both the short-term fuel trim and long-term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction and the MIL lights up.
    DTC No.                       DTC Detecting Condition                                                Trouble Area
                                                                                 S Air induction system
                                                                                 S Injector blockage
                                                                                 S Mass air flow meter
                                                                                 S Engine coolant temp. sensor
               When the air-fuel ratio feedback is stable after engine warming
                                                                                 S Fuel pressure
    P0171      up, the fuel trim is considerably in error on the RICH side
                                                                                 S Gas leakage on exhaust system
               (2 trip detection logic)
                                                                                 S Open or short in heated oxygen sensor (bank 1 sensor 1)
                                                                                   circuit
                                                                                 S Heated oxygen sensor (bank 1 sensor 1)
                                                                                 S PCV piping
HINT:
S       If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 is recorded. The MIL then
        comes on.
S       If the total of the short-term fuel trim value and long-term fuel trim value is within 

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