0084-01 Vehicle Speed loss of signal (31)
产生此代码的情况:
发动机控制模块 (ECM) 检测到以下情况：
- 车速信号显示车速为 0 MPH。
- 发动机转速高于预设的 "VSL 保护"值减去 100 RPM 至少 0.06 秒。
- 理想的发动机转速高于编程设定的 "VSL 保护"。
- 发动机转速的变化低于每秒 133 RPM 至少 0.06 秒。
- "VSL 保护"被设定为低于 2120 rpm 的值。
如果 "车速输入"被设为 "J1939-ABS" 或 "J1939-Trans"，还必须满足下列条件。
- 未能在 J1939 数据链路上接收到车速信息超过 0.5 秒。
系统响应:
发动机转速将限定在编程设定的 "VSL 保护"上。 如果 ECM 提供车速表信号，车速表将显示 0 rpm。 在卡特彼勒电子技师 (ET) 中，在 "车速"状态的旁边将会显示 "诊断"。
发动机转速将限定在编程设定的 "VSL 保护"上。
注: 尽管这个事件并不常见，但是大家都知道燃油系统阻塞可导致该诊断代码。 这种情况存在的原因就是喷油器不能在正常负载工况下提供实现理想转速需要的足量燃油。 由于正常负载工况下 ECM 无法达到理想的转速，因此，ECM 认为车辆在负载下。 这种情况只有在车辆行驶时才会出现。
检查燃油压力以确保车辆静止时燃油系统阻塞不是引起该故障的原因。
测试步骤 1. 进行以下的诊断步骤: 车速和车速表电路 - 测试
结果:
- 正常 - 停止
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