The PCM uses an input from the Vehicle Speed Sensor (VSS) and internal programming to decide what vehicle speed message is requireThe PCM then sends the proper message to the instrument cluster on the CCD data bus.

• PCM使用来自车轮转速感知器（VSS）的输入和内部程式设定确定需要何种车速消息。然后PCM在ccd资料母线上将相应的消息发送给仪表组。