欧宝威达诊断练习.doc

练习 1 CAN –BUS 练习 1 Topology of the High Speed CAN-Bus (ZC Vectra) The topology of the ZC Vectra HSCAN-bus is a design. Topology of the High Speed CAN-Bus (AH Astra) The topology of the AH Astra HSCAN is of a design. Topology of the Mid Speed CAN-bus (ZC Vectra) The topology of the ZC Vectra MSCAN-bus is a design. Topology of the Mid Speed CAN-bus (AH Astra) The topology of the AH Astra MSCAN-bus is a design. Topology of the Low Speed CAN-Bus (ZC Vectra) The topology of the ZC Vectra LSCAN-bus is a design. Topology of the Low Speed CAN-bus (AH Astra) The topology of the AH Astra LSCAN-bus is a design. 练习 2 What are the differences between the High-Speed and Mid-Speed CAN-bus wiring compared to the Low-Speed CAN-bus wiring?（高速、中速、低速网络连线的区别是什么） High speed and mid speed are two wire systems while the low speed is a single wire system The Low-Speed CAN-bus CAN high signal is referenced to ground. What are the two High and Mid-Speed signals referenced to?（低速网络信号接地，会给高速和中速的信号造成什么影响） To each other (differential system) If the ABS module is disconnected, what effect does this have to the CAN-bus? （ABS模块拆除，会给网络造成什么） ZC Vectra: Can’t communicate with modules downstream of ABS If the ABS module remains connected but loses power, what effect does this have to the CAN-bus?（ABS 模块保持连接，但是失去电源供给，会发生什么） AH Astra: No effect, can communicate with everything but ABS ZC Vectra: No effect, can communicate with everything but ABS What resistance should be measured across the two High-Speed CAN-bus connections at the diagnostic connector?测量高速网络和诊断接头之间的电阻 60 ohms With the Low-Speed CAN-bus powered down (asleep), what should the resistance measure between the Low-Speed CAN-bus connection at the diagnostic connector and ground? Varies depending on vehicle configuration Which CAN-bus system/s is the DIS connected to? Low and mid When does the High-Speed CAN-bus go to ‘Sleep’? When the ignition is switc