A/T - Intermittent Wiring Harness Short To Ground
BULLETIN NUMBER: 93-7A-51SECTION: 7A
NUMBER: 9
CORPORATE REFERENCE NUMBER: 377112R
DATE: March 1993
SUBJECT:
INTERMITTENT WIRING HARNESS SHORT TO GROUND
MODELS:
1993 C/K, S/T TRUCKS AND M/L AND G VANS W/4L60-E TRANSMISSION (M30)
CONDITION
Some 1993 vehicles equipped with the 4L60-E transmission may blow an ignition fuse which forces the transmission to default into 3rd gear starts when in D4. Possible diagnostic trouble codes (DTC's) 66, 67, 81, and 82 may exist.
CAUSE (Figure 1)
The 4L60-E transmissions built before October 1, 1992 (Julian Date 275), may have a wiring harness that has a wire connector that may short to the valve body.
CORRECTION
Follow the diagnostic procedure using Figures 2, 3, and 4.