ECM/Mem-Cal - 1986-91 Models With Mem-Cal: Notes
NOTE:
To prevent damage to ECM, ignition must be off before disconnecting or reconnecting any ECM power source (i.e.; battery, ECM connectors, ECM fuse, jumper cables, etc.).
NOTE:
The following steps are courtesy of General Motors. TECHNICAL SERVICE BULLETIN NO. T-91-95, JUNE, 1991 & TECHNICAL SERVICE BULLETIN NO. 91-6E-18, JUNE, 1991