Differences

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--- techtalk:evo:elec04 [2021/08/18 19:58]
ixl2relax [SDB - Serial Data Bus]
+++ techtalk:evo:elec04 [2021/08/18 20:05]
ixl2relax [SDB - Serial Data Bus]
@@ Line 15: / Line 15: @@
 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 U1097 is set by the Speedo if it can't send the 'state of health message'.
+--- That code is also 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.