3500B Engines for 776D, 777D, 784C, 785C, 789C and 793C Off-Highway Trucks Caterpillar


E038 Low Engine Coolant Temperature Warning

Usage:

785C 1HW
产生此代码的情况:

电子控制模块(ECM)检测到以下情况:

  • 发动机至少运转了两分钟。

  • 发动机冷却液温度已升至 75 摄氏度 (167 华氏度)以上

  • 发动机冷却液温度降至 70 摄氏度 (158 华氏度)以下的情况达两分钟。

系统响应:

记录此事件。 当温度回升到 75 摄氏度 (167 华氏度)以上时,因冷却液温度低而导致的警告将会关闭。

  • 冷却液温度传感器可能存在问题。

  • 水温调节器故障

  • 长时间怠速

  • 负荷太轻

测试步骤 1. 检查有无当前诊断代码

  1. 启动卡特彼勒电子技师(ET)。

  1. 将钥匙开关转到 ON 位置。

  1. 检查有无当前或记录的诊断代码。

预期结果:

没有任何诊断代码。

结果:

  • 与预期结果相符 - 没有任何诊断代码。 继续执行测试步骤 2。

  • 与预期结果不相符 - 有诊断代码。

    修复: 修正存在的诊断代码。

    停止

测试步骤 2. 检查冷却系统

  1. 检查冷却系统。 测试水温调节器是否正常工作。 调节器卡在开启位置会造成冷却过度。 水温调节器四周有冷却液泄漏也会造成冷却过度。 例如,排放管路泄漏。

    注: 有关测试水温调节器的信息,请参考系统操作/测试和调整手册。

预期结果:

水温调节器工作正常。

结果:

  • 与预期结果相符 - 水温调节器工作正常。

    修复: 环境温度低、负荷轻或发动机转速慢都会造成冷却过度。 此处的冷却过度是由于发动机的热量输入低造成的。

    停止

  • 与预期结果不相符 - 水温调节器存在问题。

    修复: 更换水温调节器。

    停止

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