MID 027 - CID 0168 - FMI 04
产生此代码的情况:
当 ECU 检测到低于 9 VDC 的蓄电池电压时,记录该诊断代码。
产生此诊断代码的可能原因如下:
- 机器导线线束故障
- 充电系统部件故障
- ECU 有故障。 这不太可能。
确定车辆上是否使用蓄电池充电器。 如果使用则断开充电器。 重新检查有无诊断代码。 如果诊断代码仍然激活,检查充电系统。
注: 以下测试步骤可能会生成其他诊断代码。 忽略生成的这些诊断代码,并在修复原有诊断代码后清除这些忽略的诊断代码。 执行本程序之前,请确保诊断代码 CID 0168 FMI 04 为激活状态。
测试步骤 1. 检查 J1 接头处的蓄电池电压。
Show/hide table
12 VDC 系统 | 24 VDC 系统 | ||
---|---|---|---|
低速 | 高速 | 低速 | 高速 |
12 ± 0.5 VDC | 13 ± 0.5 VDC | 24 ± 0.5 VDC | 28 ± 0.5 VDC |
确定是否有其他电气故障。 如果有其他电气故障,则蓄电池或蓄电池与过流保护设备之间的导线故障。
如果没有其他电气故障,则继续该步骤。
- 不要关停发动机。
- 使用 Caterpillar 电子技师(Cat ET)查看 "ECM 蓄电池电压"的参数值。
预期结果:
电压小于 9.0 VDC。
结果:
- 电压小于 9.0 VDC。 - 转至测试步骤 2。
- 电压大于 9.0 VDC。 - Cat ET 指出大于 9.0 VDC 的 "ECM 蓄电池电压"。 然而,存在激活的 CID 0168 - FMI 04 代码。
修复: 更换 ECM。 更换 ECM 之前,一定要咨询当地代理商征求 Caterpillar 可能的意见。 此咨询可以大大降低维修时间。 请参阅测试和调整, KENR8291, "电子控制单元 - 更换"。 确认故障已排除。
停止
测试步骤 2. 检查蓄电池上的电压。
在蓄电池端子处测量电压。
预期结果:
电压小于 9.0 VDC。
结果:
- 正常 - 蓄电池端子电压小于9.0 VDC。 蓄电池或充电系统有故障。
修复: 对蓄电池进行负载测试。 必要时,更换蓄电池。 测试充电系统。 请参阅本手册中正在维修的发动机的测试和调整, "充电系统 - 测试"。
停止
- 异常 - 蓄电池端子电压大于 9.0 VDC。 但是,P1 端子电压小于 9.0 VDC。
修复: 车辆线路有故障。 导线或部件可造成电压降。 确定电压降的原因。 在可能的情况下,修理故障。 如有必要,更换零件。 如有必要,将车辆送至 OEM 代理商进行修理。 确认故障已排除。
停止
Caterpillar Information System:
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