ok, thanks for reply.
BTW i have always wondered about this for the stock PCM setup since the 96 service manual lists typical range for cam retard in the Engine 3 Scantool Data list engine at operating temp, idling in closed loop as 0, +/-20 degs. Those are the Tech 2 data lists 1 through 3.
Since I have a set of service manual for 3 yrs, 96-98 I looked and the '98 is the only one that list the tight range in the scantool data list, and is also the only one that mentions setting at 0, and there is a the test procedure for determining intermittent setting of P1345. Quoted " When the engine speed is raised to 2000 RPM the camshaft retard offset should not vary more than two degrees." "if the distributor is one tooth off in either the advanced or retard positions the vehicle may run but 0 degrees camshaft retard offset will not be obtained." If 0 degrees cannot be obtained during this procedure refer to diagnostic aids."
None of that complexity in the 96 or 97 service manual but I think lot of extra sensors, tightening up emissions ect. added to the OBDII in '98 that i can tell from the service manuals.
The PCMs changed physically in '98 to some degree as they have an additional connector compared to the '96-'97 units. Maybe there were some internal changes that would explain the differences you're seeing in the manuals.