Celebrity V6-173 2.8L (1989)
Torque Converter Clutch: Customer Interest
Engine Controls - SES Light/Code 62 or 26, Inop TCC
Number:
89-206-7A
Section:
7A
Date:
July 1989
Subject:
INTERMITTENT AND/OR NO TCC, SERVICE ENGINE SOON LIGHT CODE 62 OR 26
Model and Year:
1988-89 A CAR WITH 3T40/125C
Figure 1
TO:
ALL CHEVROLET DEALERS
This bulletin covers a condition of inoperative or no TCC Torque Converter Clutch on a 1988 - 1989 THM 125C/HYDRA-MATIC 3T40 caused by a
2nd gear switch (338) that may be inoperative. Vehicle may exhibit intermittent service engine soon light and/or code 62 or 26 will be stored in the
E.C.M.
DATE OF PRODUCTION CHANGE: (Figure 1)
The 2nd gear switch has a 3-digit code stamped on top of the switch (metal side). The first 2 digits in the code represent the week in which the switch
was built; the 3rd digit represents the year. All switches built with a number before Julian Date 118 (April 28, 1989), or 3rd digits of 7 or 8) when
exposed to ambient operating temperatures may exhibit the following conditions:
1.
Loose (flat blade terminals)
2.
Terminals will appear blue or black in color
Inspect the torque converter clutch solenoid, third gear switch and entire wiring harness assembly for excessive heat exposure. 2nd gear switches
produced after Julian Date 118 (April 28, 1989) are not affected.
SERVICE PROCEDURE:
Do not attempt to repair suspect 2nd gear switches. If an inoperative 2nd gear switch is found in any THM/HYDRA-MATIC 3T40, replace it with a new
one.
SERVICE PARTS INFORMATION:
Refer to the following part number when replacement of the switch assembly is necessary.
Part Number
Description
8664388
Switch, 2nd Gear
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Whenever servicing a 2nd gear switch on any THM 125C/HYDRA-MATIC 3T40, refer to the Unit Repair Section of your Celebrity Service manual.
