8–10
Copyright © 1998 General Motors Corp.
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
W T E C I I E L E C T RO N I C C O N T RO L S T RO U B L E S H O OT I N G M A N UA L
LOW PRESSURE SECTION
LOW PRESSSURE
A.
Low Main Pressure in
All Ranges
(Including C6, T-Case)
Incorrect fluid level
Correct fluid level (refer to the
Mechanic’s Tips Handbook for
correct dipstick calibration)*
Oil filter element clogged or
faulty
Replace oil filter (refer to
transmission Mechanic’s Tips)
Plugged or faulty suction filter
Clean or replace oil suction filter
element and refill the
transmission (refer to
transmission Mechanic’s Tips)
Main pressure regulator valve
sticking
Overhaul control module
assembly (refer to transmission
Service Manual)
Main pressure regulator valve
spring weak, broken, or missing
Check spring and replace if
necessary (refer to transmission
Service Manual)
Control module body leakage
(separator plate not flat, separator
plate gasket leakage, loose
control valve body bolts)
Replace or rebuild control
module assembly. Care should be
taken when removing and
labeling shift springs (refer to
transmission Service Manual)
Faulty or incorrect fluid pressure
gauge
Repair or replace gauge
Oil pump worn or damaged
Replace or rebuild oil pump
(refer to transmission Service
Manual)
B.
Clutch Pressure Low in
Specific Ranges, Normal
Pressure in Other Ranges
See Range Clutch
Troubleshooting section and
Appendix B
C.
Low Lubrication Pressure
Incorrect fluid level
Correct fluid level (refer to the
Mechanic’s Tips Handbook for
proper dipstick calibration)
Plugged lube filter
Change filter (refer to
Transmission Mechanic’s Tips)
* See Appendix B — Check main pressure, clutch pressure, and pressure specifications.
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause
Suggested Remedy
