P0117 code definition

发动机冷却液温度（ECT）传感器电路低输出问题

P0117代码意味着什么

P0117是OBD-II通用代码，表明发动机控制模块（ECM）看到ECT传感器输出的速度小于0.14伏或超过140°C（284°F）。

What causes the P0117 code?

• ECT sensor input to the ECM went to more than 0.14 Volts or 140°C (284°F) indicating a short circuit in sensor or wiring.

• ECT传感器或接线短路。

P0117代码的症状是什么？

• ECM turns on the Check Engine Light and goes into failsafe mode substituting input to 176° F.
• The engine may have a hard start when engine is cold.
• 发动机可能会粗糙并犹豫，直到发动机变暖。
• The engine should run close to normal once the engine warms up.

Note: The symptoms are determined by the manufacturer failsafe ECM strategy for the vehicle during a failure and may vary between manufacturers and vehicles.

机械师如何诊断P0117代码？

• 视觉检查以检查是否有任何电气连接器，接线或传感器问题。

• The technician will scan and document the codes received and view the freeze frame data to see when the code was set.

• The codes should then be reset to clear the OBD-II fault codes and retest the vehicle to see if the code comes back.

• 断开ECT传感器，观察实时数据，以查看读数是否从284°F到-40°F。

• 如果读数转到-40°F，请替换ECT传感器（如果不），请查找线束，连接器或ECM。

Common mistakes when diagnosing the P0117 code?

不遵循以下简单步骤：

• 始终首先进行视觉检查。

• 制造商精确测试步骤遵循逐步不跳过任何步骤的步骤。

• 除非测试表明问题，否则请勿更换ECT传感器。

• Before installation of the new ECT sensor, try connecting it and viewing the ECM data to see if the temperature output from the sensor is as expected.

How serious is the P0117 code?

• P0117代码将使引擎ECM进入故障安全模式。

• 故障安全模式可能会导致发动机运行粗糙并犹豫，直到发动机变暖到工作温度为止。

• 电冷风扇可能会连续运行。

What repairs can fix the P0117 code?

• Resetting the fault codes and perform a road test
• 维修或更换ECT连接器
• Repairing or replacing the wiring as necessary
• Replacing the ECT with a new sensor

有关P0117代码的其他评论

• The ECT sensor shorted is the most common failure.

• Some failures for code P0117 other than the sensor include a harness shorting or a connector corrosion issue.

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