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> ECUs are connected together [...] doesn’t hear from another ECU it needs to talk to [...] there is an ECU that controls the lights This is very unusual termi
by hunter2_ 2y ago
> ECUs are connected together [...] doesn’t hear from another ECU it needs to talk to [...] there is an ECU that controls the lights
This is very unusual terminology. Most vehicles have exactly 1 ECU (occasionally 2, and addresses are allocated for ~4 depending on the gateway) which controls exclusively the engine parameters. The BCM, the HVAC, the ABS, the MIB, etc. are all other modules (nodes on the network) which go by names other than ECU. For example, TCU for the transmission.
Any module can throw a DTC, but only a DTC from the ECU will illuminate the MIL (check engine light).
- bri3d 2y agoThey just believe that ECU = Electronic Control Unit rather than ECU = Engine Control Unit. Both are accepted terminology in different parts of the industry, although I'd have just used the word "module" instead.
- hunter2_ 2y agoI'd never heard of the former, but it seems that's the case! Thanks.
- deleted 2y ago[deleted]
- maxerickson 2y agoIt's not wildly obscure. For instance Wikipedia currently uses it: https://en.wikipedia.org/wiki/Electronic_control_unit https://en.wikipedia.org/wiki/Electronic_control_unit Note that I'm not arguing Wikipedia using it means it is "correct" or whatever, just that it demonstrates it being at least somewhat commonplace.
- hunter2_ 2y agoInteresting, though Wikipedia also uses it the way I do: https://en.wikipedia.org/wiki/Engine_control_unit https://en.wikipedia.org/wiki/Engine_control_unit