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techtalk:evo:elec04 [2021/08/18 19:58] ixl2relax [SDB - Serial Data Bus] |
techtalk:evo:elec04 [2021/08/18 19:59] ixl2relax [SDB - Serial Data Bus] |
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| The ICM, TSM & Speedo/Tach regularly communicate their current status to one another. When all operating parameters on the serial data line are within specifications, a state of health message is sent between the components. | The ICM, TSM & Speedo/Tach regularly communicate their current status to one another. When all operating parameters on the serial data line are within specifications, a state of health message is sent between the components. | ||
| - | A DTC of U1016 (Diagnostic Code) is set when the ICM can't send that 'state of health message'. | + | A DTC of U1016 (Diagnostic Code) is set when the ICM can't send that 'state of health message'.\\ |
| - | A DTC of U1255 is set when no messages are communicated at power up. | + | --- That code is also set if there was communications, but it stopped at some point.\\ |
| - | A DTC of U1016 is set if there was communications, but it stopped at some point. | + | A DTC of U1255 is set when no messages are communicated at power up.\\ |
| The SDB is designed upon a standard SAE serial communication protocol callded "J1850". The digital data is transmitted and received on a single wire at around 10.4 Kbps. This protocol was used thru the 2013 model year. | The SDB is designed upon a standard SAE serial communication protocol callded "J1850". The digital data is transmitted and received on a single wire at around 10.4 Kbps. This protocol was used thru the 2013 model year. | ||
