it sure does. it should be in the fsm.
IIRC, you need to have the engine at running temp then rev the motor 3x past 3k then unplug the tps then set timing.
At least that is for the fw SRs, i can't imagine that it is any different. check this site for a more detailed description ---
http://www.b15sentra.net/modul...=3#22
look for the how to on ignition timing base advance. the how to includes how to get into timing mode and tells you about the how to set base idle. also the instruction is slightly different from what the FSM will tell you, but it works. For my G20 this was the only way i managed to get into timing mode.