Copyright © 1998 General Motors Corp. 8–9
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
EXCESSIVE SLIPPAGE AND
CLUTCH CHATTER
(cont’d)
Incorrect fluid level
Correct fluid level (refer to
Mechanic’s Tips for proper
dipstick calibration
measurements)
Main pressure low Refer to the Low Pressure
section
Lockup clutch not applied Inspect lockup clutch system
wiring, pressure, and controls;
repair as necessary (refer to
transmission Service Manual)*
A
. Ranges 1, 2, 3, 4 Only
(6-Speed)
Ranges 2, 3, 4, 5 only
(7-Speed)
C1 clutch slipping, leaks at
splitline gasket, leaks at rotating
clutch seals, leaks at piston seals,
C1 clutch plates worn
Inspect control module gasket,
C1 clutch plates, and piston and
rotating seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
B
. Ranges 4, 5, 6 Only
(6-Speed)
Ranges 5, 6, 7 only
(7-Speed)
C2 clutch slipping, leaks at
splitline gasket, leaks at rotating
clutch seals, leaks at piston seals,
C2 clutch plates worn
Inspect control module gasket,
C2 clutch plates, and piston and
rotating seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
C.
Ranges 3, 5, R Only
(6-Speed)
Ranges 1, 4, 6, R only
(7-Speed)
C3 clutch slipping, leaks at face
seals, leaks at piston seals,
C3 clutch plates worn
Inspect control module face
seals, C3 clutch plates, and piston
seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
D.
Ranges 2, 6 Only
(6-Speed)
Ranges 3, 7 only
(7-Speed)
C4 clutch slipping, leaks at face
seals, leaks at piston seals,
C4 clutch plates worn
Inspect control module face
seals, C4 clutch plates, and piston
seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
E.
Ranges 1, R Only
(6-Speed)
Ranges 2, R only
(7-Speed)
C5 clutch slipping, leaks at face
seals, leaks at piston seals,
C5 clutch plates worn
Inspect control module face
seals, C5 clutch plates, and piston
seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
F.
Range Lo Only
(7-Speed)
C6 clutch slipping, leaks at
splitline gasket(s), leaks at piston
seals, C6 clutch plates worn
Inspect control module gasket,
adapter gasket, T-Case gasket(s),
C6 clutch plates, and piston
seals; replace/rebuild as
necessary (refer to transmission
Service Manual)*
* See Appendix B — Check main pressure, clutch pressure, and pressure specifications.
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause Suggested Remedy
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