854K Wheel Dozer and 992K, 993K Wheel Loaders VIMSTM 3G / Product Link Caterpillar


Power Supply Circuit of Electronic Control Module

Usage:

992K 880
系统运作描述:

以下情况可导致 ECM 的电源供应中断:

  • 开路

  • 不良连接

  • 保险丝熔断或断路器跳脱

短路或电路过载可导致保险丝熔断或断路器跳闸。

测试步骤 1. 检查 ECM 有无电源和接地

在 VIMSTM 3G 主 ECM 上,测量触点 52 (导线 170-RD)和触点 65 (导线 251-BK)之间的电压。

预期结果:

测量电压等于系统电压。

结果:

  • 正常 - 测量电压等于系统电压。停止

  • 异常 - 测量电压过低或不存在。 转至测试步骤 2。

测试步骤 2. 检查保险丝或断路器

  1. 检查 ECM 电源保险丝或断路器。

    ECM 保险丝导线为 170-RD。

预期结果:

保险丝完好或断路器没有跳脱。

结果:

  • 正常 - 保险丝完好或断路器没有跳脱。 转至测试步骤 3。

  • 异常 - 保险丝熔断或断路器跳脱。

    修复: 更换保险丝或复位断路器。监视机器故障是否重新出现。 如果故障持续存在,则必须纠正故障原因。

    停止

测试步骤 3. 检查 ECM 电源线

  1. 切断钥匙开关和断路开关。

  1. 测量保险丝或断路器上的 VIMS 3G ECM 导线 170-RD 和 VIMS 3G 主 ECM 接头触点 52 的电阻。

预期结果:

电阻值低。

结果:

  • 正常 - 电阻值低。 转至测试步骤 4。

  • 异常 - 电阻值高。 电路开路。

    修复: 修理或更换线束。

    停止

测试步骤 4. 检查 ECM 的接地

  1. 钥匙开关和断路开关保持断开状态。

  1. 测量 VIMS 3G 主 ECM 接头的触点 65 251-BK 与机架接地之间的电阻。

预期结果:

电阻值低。

结果:

  • 正常 - 电阻值低。 ECM 可能出现故障,但 ECM 不太可能会出现故障。

    修复: 重新执行本步骤。 如果故障仍然存在,请咨询您的 Cat 代理商。 如果需要更换 ECM,请参阅测试和调整, "电子控制模块(ECM)- 更换"。

    停止

  • 异常 - 电阻值高。

    修复: 修理或更换线束。

    停止

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