P0378 OBD-II Trouble Code: Timing Reference High Resolution Signal B Intermittent/Erratic Pulses

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诊断P0378代码的成本

P0378 is a diagnostic trouble code (DTC) for "Timing Reference High Resolution Signal B Intermittent/Erratic Pulses". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the检查引擎灯diagnosticfor $114.99。一旦我们能够诊断出该问题,就会为您提供建议的修复程序的前期报价,并获得20.0美元的折扣作为维修的信用。我们所有的维修都得到了我们12个月 / 12,000英里的保修。

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P0378 code definition

如果PCM存储了代码P0378,则意味着系统已从高分辨率时机参考信号B中检测到异常的脉冲读数,这表明系统电路有故障。

What the P0378 code means

注射泵中的是一个传感器磁盘,该磁盘发出PCM用于控制燃油喷射时间的脉冲。PCM测试丢失的脉冲,并将其与制造商应检测到的脉冲数量进行比较。如果此值不正确或不正确,则PCM将存储代码P0378。

是什么原因导致P0378代码?

有很多事情可能会导致传感器磁盘和PCM之间的脉冲读数不稳定。这些通常包括有缺陷的曲轴,凸轮轴或分配器位置传感器。

但是,其他原因可能包括:

  • Failure of the distributor
  • Open or shorted optical sensor
  • 故障,腐蚀,损坏,打开或短路接线或连接器
  • PCM失败,在极少数情况下

P0378代码的症状是什么?

The P0378 code could be preceded by no symptoms at all besides the illumination of the Check Engine light. However, it could also be preceded byengine misfiring,加速时敲门,并降低了燃油经济性。

How does a mechanic diagnose the P0378 code?

A mechanic should first abstract code information from the PCM with an OBD-II scanner, and check for other codes that may indicate a larger or related issue.

为了诊断P0378代码的原因,许多机械师首先检查曲轴齿轮和万博亚洲客户端曲轴位置传感器。这是通过在发动机运行时检查发动机RPM信号来完成的。如果未检测到信号,则需要对曲轴和相关组件进行视觉检查。技术人员应修复或更换任何故障的组件。此过程消除了P0378代码最常见的问题之一,并可能有助于缩小以下维修的选项。

Common mistakes when diagnosing the P0378 code

在诊断P0378代码时,一个常见的错误是忘记在执行每个潜在解决方案后清除代码并进行道路测试。每个维修后都应完成此步骤,以帮助更快地缩小原因。通过复制故障时刻,机械师可能能够更快地发现问题。

P0378代码的另一个常见错误是自动替换曲轴,凸轮轴或分配器传感器,而不是检查机械分配器故障或其他问题。此外,重要的是要替换曲轴或凸轮轴传感器,而不是单独替换曲轴或凸轮轴传感器。

P0378代码有多严重?

由于P0378代码直接与PCM控制燃油喷射和时间有关,因此这是一个非常严重的问题,应立即解决。当检测到该问题时,无法解决此问题,可能会导致其他发动机组件无法获得燃料或纠正燃油压力。

What repairs can fix the P0378 code?

In order to address a P0378 code, there are a few repairs that a mechanic may choose to perform. These include:

In the rare case that the PCM is faulty, the mechanic may replace the PCM.

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检查引擎灯
故障代码
P0378

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