Diagnostic Capabilities
发动机电子控制模块(ECM)可以监视 ECM 和发动机部件之间的电路。 ECM 还可以监视发动机工况。 如果 ECM 检测到故障,就会产生一个代码。
有两种代码:
- 诊断代码
- 事件代码
诊断代码 - 诊断代码表示发动机配线或电气部件内存在短路或断路等电气故障。
事件代码 - 事件代码是因为检测到发动机异常工况而产生的。 例如,如果机油压力过低,就会产生一个事件代码。 在此情况下,事件代码表明故障现象。 事件代码通常表示存在异常工况或机械故障,而并非电气故障。
代码可以有两种不同的状态:
- 主动
- 记录
现行代码表示存在故障。 首先应处理现行代码。 有关特定代码的相应故障排除步骤,参考以下故障排除步骤:
- 故障排除, "诊断故障代码"
- 故障排除, "事件代码"
这些代码被记录和存储在 ECM 存储器中。 故障可能已经排除和/或故障可能不再存在。 如果系统通电,当部件断开时可能会生成现行诊断代码。 重新连接该部件后,代码不再为现行状态,但代码可能变为记录状态。
记录的代码可能并不意味着需要修理。 故障可能只是暂时存在过。 记录的代码可能对间歇性故障的故障排除有帮助。 记录的代码也可以用来检查发动机和电子系统的性能。
增强型故障排除指示器 (ETI) 具有附加状态屏幕可用。 此屏幕通过 Cat® 电子技师 (ET) 访问。
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