| 摘要 |
<p>A CNG ECU (20) typically determines a problem to be present when a state where the CNG pressure (P1) in a low-pressure line that is detected by a pressure sensor (10) for low pressures is higher than a threshold (PH) persists for a prescribed time or longer, and performs high-pressure problem diagnostics on the low-pressure line. However, when a fuel cut is performed immediately after switching to CNG, a problem is not determined to be present even when the state where the CNG pressure (P1) is higher than the threshold (PH) persists for the prescribed time or longer, whereby a persisting high-pressure state of the low-pressure line accompanied by a fuel cut is prevented from being mistakenly determined to be a problem.</p> |
