B1946代码定义

B1946代码是与气候控制系统有关的制造商特定的身体代码。在这种情况下，发动机控制模块（ECM）已检测到蒸发器温度传感器的故障气候控制系统或者A/c。

B1946代码意味着什么

当ECM检测到蒸发器传感器的电压信号时，将存储代码B1946，该电压信号信号显示故障（信号应根据车辆的制造和型号为大约5伏）。

Under normal operation, the LH and RH discharge temperature sensors receive a ground from the Dual Automatic Temperature Control (DATC) module. The evaporator discharge temperature sensor receives a ground from the DATC module. A 5-volt reference voltage is supplied to the LH and RH discharge temperature sensors from the DATC module. A 5- volt reference voltage is supplied to the evaporator discharge temperature sensor from the DATC module.

是什么原因导致B1946代码？

几个问题可能导致B1946代码，包括：

• 故障，损坏或有缺陷evaporator temperature sensor
• 损坏或有缺陷的气候控制单元
• 气候控制单元和蒸发器温度传感器之间的接线线束中的打开或短路

What are the symptoms of the B1946 code?

Symptoms of a B1946 code may include:

• Check engine or warning light may illuminate
• 气候控制或空调可能不会吹冷空气
• 气候控制或空调可能根本不起作用
• 除了存储的B1946代码外，可能没有其他症状

机械师如何诊断B1946代码？

机械师可以使用多种方法诊断B1946故障代码，包括：

• Utilize an OBD-II scanner to check for a stored B1946 trouble code
• Visually inspect wiring and electrical components related to theevaporator temperature sensorfor signs of damage
• 视觉检查蒸发器温度传感器是否有损坏的迹象
• Test the resistance on the evaporator temperature sensor (resistance should be measured compared with temperature ranges)
• 检查DATC传感器输出电压（应在4.7和5.1伏之间）
• 断开气候控制单元和蒸发器温度传感器连接器，并检查具有小于5欧姆电阻的开路
• 检查返回电路是否开放或短路
• 检查参考电路是否短到地面
• 检查参考电路，以便返回电路的短短

B1946代码有多严重？

Because a vehicle’s safe driving operation most likely will not be impacted due to faults that store a B1946 code, this code is not considered to be a serious code. When this code appears, it is recommended to take your vehicle to your local service center or mechanic for repair and diagnosis as soon as possible.

哪些维修可以修复B1946代码？

几个维修可以修复B1946故障代码，并包括：

• Repair or replace damaged or shorted electrical wiring and related components
• 更换损坏或有缺陷的蒸发器温度传感器
• Replace damaged or defective DATC unit
• Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Additional information related to a B1946 code

It is always recommended to take all proper safety precautions when working with the electrical components of your vehicle and to carefully follow service instructions. With more complicated electrical repairs, it is recommended to seek assistance from a professional.

此外，请注意，蒸发器核心，驾驶员侧加热器芯和乘客侧加热器核心排放空气温度传感器具有相同的诊断过程。

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