GN3433EN V7.fm Page 123 Tuesday, June 19, 2007 9:50 AM
13–2. SEM/LRTP Depending on the TCM’s SEM/LRTP configuration (indicated by Auto Select Configuration), the transmission controller conducts a series of tests to determine the SEM/LRTP enabling status. These tests are only performed when new TCM software is loaded into a TCM and/or when the tool resets SEM Autoselect (refer to Reset SEM Auto-Select action request). In order to “pass” the SEM/LRTP Autoselect tests, the TCM must detect an Allisonvalidated/certified engine, and the engine must support—and react correctly—to all J1939 messages and parameters required by SEM/LRTP. Otherwise, the SEM/LRTP Autoselect tests would “fail.”
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