DeVille V8-300 4.9L (1993)
Torque Converter Clutch: Customer Interest
VCC - Slipping or No Engagement
Bulletin No.: T-93-108
File in Group: 7
Number: 256
Corp. Ref. No.: 377119
Date: July, 1993
SUBJECT:
NO/SLIPPING VISCOUS CONVERTER CLUTCH (VCC) WHEN COMMANDED ON (CODE 39)
MODELS AFFECTED:
1993 DE VILLES, SIXTY SPECIALS, ELDORADOS, AND SEVILLES
Some 1993 DeVilles, S&W Specials, Eldorados, and Sevilles equipped with a Hydra-Matic 4T60-E (RPO M13) transaxle built on or before January 26,
1993 (Julian Date 026) may exhibit no VCC apply or a slipping VCC condition (possible code 039). Refer to Figure 1.
NOTE:
The VCC mod solenoid will normally mis-operate in either a full apply or a fun slip mode. These conditions should not be confused with a VCC
chuggle or VCC shudder which is more likely engine performance related.
NOTE:
Excessive heat on torque converter may be visible when VCC slipping condition exists.
This condition may be due to sediment trapped in the Pulse Width Modulated (PWM) VCC mod solenoid. Refer to Figure 2. Sediment may enter the
solenoid from either the control or feed passages and lodge in the flow path around the metering ball causing an undesired exhaust leak.
NOTE:
To prevent a customer comeback careful diagnosis is highly recommended. Do not automatically assume that the condition is caused by the above
