Torque Converter Clutch (TCC) - Hunting
Model Year 1983Bulletin No. 83-217
File In Group 70
Number 43
Date
Jan.. '84
SUBJECT: TORQUE CONVERTER CLUTCH (TCC) HUNTING
MODELS AFFECTED: 1983 SKYLARKS & CENTURYS EQUIPPED WITH 2.5L L-4 ENGINE (VIN CODE R) AND ECM 1226100
Some comments on TCC hunting particularly when operating with the cruise control engaged, have been received on some of the above mentioned vehicles.
To correct this condition, two new PROMS have been released to assist in TCC engagement. To determine that the vehicle has a 2 board 1226100 ECM inspection of the certification label on the drivers door provides the build date of the vehicle, vehicles built prior to April 1983 have the two board ECM. Vehicles after that date have single board ECM's.
The below listed PROMS are not to be used in single board ECM's.
PROM BROADCAST CODE REPLACES BROADCAST CODE AXLE RATIO
1226647 CCY 1226439 CCY 2.84
1226648 CDL 1226441 CDL 2.39