| 摘要 |
PURPOSE: A fuel line diagnosing method for a liquefied petroleum gas injection vehicle is provided to prevent unnecessary fault code from being outputted by diagnosing reasons why the pressure change of the fuel line is caused in the LPI vehicle. CONSTITUTION: A fuel line diagnosing method for a liquefied petroleum gas injection vehicle detects the pressure of a fuel line, and increases and revises fuel in case of the lean state of air fuel ratio(S105). The pressure of the fuel line is normally restored during revising and increasing the fuel. In case the pressure of the fuel line is normally restored, the pressure change frequency of the fuel line is counter-integrated(S108). In case the integrated pressure change frequency is over the reference count, the fuel jet is controlled according to driving condition and fault code is outputted over a fuel pump(S109).
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