Configuration Parameters
如果表 1 中的诊断代码为现行状态，请使用本步骤。
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| 与配置参数有关的代码 | |||
|---|---|---|---|
| J1939 代码 | CDL 代码 | 代码说明
（代码说明可能不同） |
注释 |
| 630-2 | 268-2 | 已编程参数故障：不稳定、间歇或不正确 | 发动机电子控制模块（ECM）检测到一个或多个可编程参数未编程设定。
ECM 可能使用一个默认扭矩图表，或者可能将发动机转速限制为低怠速。 代码仅为激活状态。 |
| 遵循故障排除步骤来确定故障根源。 | |||
电子维修工具可用来查看影响发动机操作的特定参数。 电子维修工具还可用来更改某些参数。 某些参数不能修改，并且某些应用不允许更改可编程监控系统。 这些参数存储在电子控制模块（ECM）中。 这些参数中的一些参数受密码保护，以防擅自更改。 可以被更改的参数有一个记录数。 记录数显示某一参数是否被改动过。
参数分为两种不同的类型：
客户指定参数 - 修改用户指定参数可能需要用户密码。
系统配置参数 - 系统配置参数影响发动机的排放或发动机的功率。 修改系统配置参数的数值可能需要出厂密码。
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| 图 1 | g03747092 |
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典型配置屏幕 | |
- 连接电子维修工具。
- 选择 Service（维修）栏。
- 通过选择 Configuration（配置）栏查看配置参数。
如果更换 ECM，必须从旧 ECM 中复制对应参数。 使用电子维修工具的 "Copy Configuration（复制配置）"特性复制参数。 "Copy Configuration（复制配置）"栏位于 "Configuration（配置）"栏下方。 另外，也可以将设置记到纸上，然后再将其编程设定到新模块的配置屏幕上。
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| 注意 |
|---|
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在发动机运行中修改参数可导致发动机运行不稳定和发动机损坏。 只能在发动机停止时修改参数的设定值。 |
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| 图 2 | g03747100 |
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典型现行诊断代码屏幕 | |
如果有可编程参数未编程设定，ECM 将产生 268-2 或 630-2 诊断代码。 将在此代码下方列出未编程的可编程参数。 图 1 显示了 268-2 代码下未编程设定的参数。 未编程的参数将被设为默认值。 某些发动机性能和发动机监控功能会爱到影响。
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