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INTEGRITY IS EVERYTHING
| 题名： | INTEGRITY IS EVERYTHING |
| 正文语种： | eng |
| 作者： | BRANDON STECKLER |
| 摘要： | For automotive emissions control, it truly takes a team. One of the team members is the evaporative emissions control system (EVAP). But, in the case of this 2013 Honda Cross-tour, it seems this EVAP system is a huge letdown on just about every trip the vehicle makes. As the vehicle is driven and meets the criteria for an EVAP large leak test, a failure occurs, and the vehicle displays the message "Check fuel cap" on the instrument panel cluster. The strange part is the vehicle has no pending, current, or history DTCs. Even stranger, the message is displayed whether the driver made a pit stop for fuel or not. I mention that because in my experience, most vehicles will correlate a loose fuel cap with a large leak test failure that occurs only after a change in fuel level (usually a change in level of about 25 percent). And that typically sets a pending DTC. What's more, this vehicle (like most today) implements a key-off natural vacuum testing strategy. This type of testing all but eliminates the fuel-volatility issue that can mask smaller leaks during driving conditions and with the heat of the exhaust system beneath the fuel tank. Today, systems are capable of detecting EVAP leaks as small as 0.010." |
| 出版年： | 2023 |
| 期刊名称： | Motor age |
| 卷： | 142 |
| 期： | 9 |
| 页码： | 43-45 |
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