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THE TRAINER #126: DIAGNOSING INTERMITTENT CAN CODES
| 题名： | THE TRAINER #126: DIAGNOSING INTERMITTENT CAN CODES |
| 正文语种： | eng |
| 作者： | PETE MEIER |
| 摘要： | Dealing with "no communications" codes can be a challenge, especially today when a single network can be host to numerous computers. Often, these issues can be traced to a failed module or hard fault in the bus wiring. But once in a while, the fault is intermittent, occurring with no readily apparent cause. How do you tackle either? With a little research, a wiring diagram or two, and a diagnostic plan! First, we have to understand how the CAN network functions. The highspeed CAN we're focusing on uses a twisted pair of wires with a 2.5v bias. One side, CAN High, is pulled up 1.0v when communications are taking place while CAN Low is pulled down 1.0v. The two, when viewed on a scope, are mirror images of one another. Next, we need to see what modules are on the network and which ones are talking and which ones are not. Typically, when a module fault is the cause of the code, all the other modules will have communications codes (U-codes) stored pointing at the failed module. The Autel tool makes this all easy to see using the "Topology" mode to perform the full system scan. |
| 出版年： | 2022 |
| 期刊名称： | Motor age |
| 卷： | 141 |
| 期： | 5 |
| 页码： | 56-56 |
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