P0641 OBD-II: 传感器基准电压 "A "电路/开路 OBD-II故障代码P0641是什么意思？
代码P0641表示传感器参考电压'A'电路开路。
车辆的计算机，即动力总成控制模块（PCM），向许多车载传感器提供一个参考电压。 通常情况下，该参考信号为5伏。 然后，传感器根据它们所测量的内容验证该电压信号，并将其发送回PCM。
虽然外部传感器参考电路彼此独立，但有时它们在 PCM 内部相连。 例如，在某些通用汽车上，发动机机油压力传感器和歧管绝对压力传感器在 PCM 内部总线在一起。 这可能导致一个传感器的 5 伏参考电路影响另一个传感器。
代码P0641表示PCM检测到5伏参考电路的电压不符合标准。 代码的'A'部分表示问题出在第一个传感器上，如果问题出在不止一个传感器上。
注：通常情况下，当代码 P0641 被存储时，制造商的维修信息将指示受影响的传感器电路。 例如，在一辆车上，代码 P0641 可能指示动力输出（PTO）参考电路的问题。 在另一辆车上，它可能指燃油压力传感器。 .
P0641症状
由专业人员进行诊断
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See_also: P054B OBD II故障代码 P0641的常见原因
代码P0641通常由以下原因之一引起：
如何诊断和维修P0641
进行初步检查
有时P0641会间歇性出现，如果该代码是历史代码而不是当前代码，情况尤其如此。 清除该代码并查看它是否返回。 如果返回，下一步是进行目视检查。 经过培训的眼睛可以检查诸如断线和连接松动等问题。 如果发现问题，则应修复该问题并清除该代码。 如果没有发现任何问题，则检查技术服务公告（TSB）。 TSB是由汽车制造商发布的建议诊断和维修程序。 查找相关的TSB可以大大减少诊断时间。
检查电路
在初步检查之后，应检查参考电路。 这可以使用数字万用表（DMM）来完成。 传感器通常有两到三根导线连接，其中一根是参考信号。 万用表应显示 PCM 向传感器提供的参考电压良好。 如果不是，则应检查传感器和 PCM 之间的线路，并根据需要进行修理。
See_also: P2291 OBD II故障代码 检查传感器
通常情况下，技术人员要做的下一件事是检查传感器。 这可以通过连接到车辆诊断端口的诊断扫描工具来完成。 有关传感器产生的数据可以与制造商的规格进行比较。 如果数值超出规格，则传感器可能有故障，应予以更换。
也可使用 DMM 或示波器直接在传感器上检查传感器的运行情况。 同样，在这些工具上查看的数值应与制造商的规格一致。
检查PCM
在极少数情况下，PCM可能存在故障。 PCM应为相关传感器提供5伏参考电压。 如果没有，则可能存在故障或需要重新编程。
与P0641相关的其他诊断代码
- P0642：代码P0642表示动力总成控制模块（PCM）检测到传感器'A'电路的参考电压过低。 这通常表示短路。
- P0643：代码P0643表示动力总成控制模块（PCM）检测到传感器'A'电路的参考电压过高。 这通常表示电路开路。
代码 P0641 技术细节
当发动机运转且PCM检测到电压超出容许范围超过2秒时，代码P0641被设置。
Ronald Thomas
Jeremy Cruz is a highly experienced automotive enthusiast and a prolific writer in the field of auto repair and maintenance. With a passion for cars that dates back to his childhood days, Jeremy has devoted his career to sharing his knowledge and expertise with consumers who seek reliable and accurate information about keeping their vehicles running smoothly.As a trusted authority in the automotive industry, Jeremy has worked closely with leading manufacturers, mechanics, and industry experts to gather the most up-to-date and comprehensive knowledge in auto repair and maintenance. His expertise extends to a wide range of topics, including engine diagnostics, routine maintenance, troubleshooting, and performance enhancement.Throughout his writing career, Jeremy has consistently provided consumers with practical tips, step-by-step guides, and trusted advice on all aspects of auto repair and maintenance. His informative and engaging content allows readers to understand complex mechanical concepts easily and empowers them to take control of their vehicle's well-being.Beyond his writing skills, Jeremy's genuine love for automobiles and innate curiosity have driven him to constantly stay abreast of emerging trends, technological advancements, and industry developments. His dedication to informing and educating consumers has been recognized by loyal readers and professionalsalike.When Jeremy isn't immersed in automobiles, he can be found exploring scenic driving routes, attending car shows and industry events, or tinkering with his own collection of classic cars in his garage. His commitment to his craft is fueled by his desire to help consumers make informed decisions about their vehicles and ensure they have a smooth and enjoyable driving experience.As the proud author of the blog for the leading provider of auto repair and maintenance information to consumers, Jeremy Cruz continues to be a reliable source of knowledge and guidance for car enthusiasts and everyday drivers alike, making the road a safer and more accessible place for all.
