U0155 OBD II代码:与仪表组失去通信

U0155 OBD II代码:与仪表组失去通信
Ronald Thomas
U0155 OBD-II: Lost Communication With Instrument Panel Cluster (IPC) Control OBD-II故障代码U0155是什么意思?

仪表盘包含车辆仪表和警告灯。 现代仪表盘非常先进。 仪表盘通过控制器区域网络(CAN)总线与整个车辆的计算机进行通信。 在某些情况下,仪表盘充当CAN总线上的网关。 仪表盘还可以执行其他任务,例如充当与发动机和变速器的接口。防盗系统。

车辆的所有计算机(称为模块)都通过CAN总线共享和接收信息。 总线由两条线路组成:CAN高线和CAN低线。 它们被称为高线和低线是因为它们的数据传输速率不同。 CAN高线的通信速率为500k比特/秒,而CAN低线的通信速率为125k比特/秒。 由于总线上的通信是双向的,因此终端电阻必须是双向的。CAN 总线两端各有一个终端电阻。

代码U0155表示仪表盘无法接收或发送CAN总线上的信息。

仪表盘 / 图片来源

U0155症状

  • 发动机检查指示灯点亮
  • 仪表盘性能问题

由专业人员进行诊断

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U0155的常见原因

代码U0155通常由以下原因引起:

  • 电池没电
  • 仪表盘故障
  • 仪表盘电路有问题
  • CAN总线出现问题

如何诊断和维修U0155

进行初步检查

有时U0155会间歇性出现,或者可能是蓄电池没电造成的。 如果该代码是历史代码而不是当前代码,则尤其如此。 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代码。如果没有任何发现,检查技术服务公告(TSBs)。 TSBs是汽车制造商发布的推荐诊断和维修程序。 查找相关的TSB可以大大减少诊断时间。

检查电池

在蓄电池电压不足的情况下,仪表组无法正常通信。 根据需要对蓄电池进行测试、充电或更换。 然后清除故障代码。

检查其他DTC

为多个模块设置的故障诊断代码(DTC)表明CAN网络存在潜在问题。 在这种情况下,专业人员将首先检查网络的完整性,而不是重点检查仪表盘。

See_also: P0551 OBDII故障代码

可以检查CAN总线是否存在短路、高阻和开路等缺陷。 这一过程通常从数据链路连接器开始。 数据链路连接器有16个引脚,其中6号和14号引脚分别为CAN高电平和CAN低电平。 数字万用表(DMM)可连接到其中一个或两个引脚上进行测试。 如果发现问题,则进行进一步测试,以隔离和修复问题。

检查CAN总线的另一种方法是使用分线盒。 该分线盒用于监控CAN总线通信和发现问题。 它直接连接到数据链路连接器上。 还可以使用DMM在数据链路连接器上检查两个CAN总线终端电阻。 将DMM连接到连接器的引脚6和引脚14之间进行检查。 读数为60欧姆时,表明电阻完好无损。

See_also: P0714 OBD II故障代码

检查仪表盘

现在是时候开始关注仪表盘了。 技术人员要做的第一件事是尝试通过诊断扫描工具与仪表盘进行通信。 该工具直接连接到车辆诊断端口。 一旦连接成功,该工具就可以像其他模块一样通过总线进行通信。

如果仪表组没有响应,则必须确定原因。 与任何其他电气设备一样,仪表组必须有完整的电路,包括电源和接地。 可以使用 DMM 测试电路。

此时,所有迹象都表明仪表盘有故障。 然而,在谴责仪表盘之前,应检查其软件。 在某些情况下,重新编程仪表盘可解决问题。 如果不是,则需要更换仪表盘。 有些仪表盘在更换后需要编程。

与U0155相关的其他诊断代码

所有 "U "代码均为网络通信代码。 代码 U0100 至 U0300 为与 XX 模块失去通信的代码。

代码 U0155 技术细节

在许多车辆上,蓄电池电压必须在 9 - 16 伏之间才能设置代码 U0155。




Ronald Thomas
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.