Copyright © 1998 General Motors Corp. 8–11
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
LOW PRESSURE
(cont’d)
C.
Low Lubrication Pressure
(cont’d)
Excessive internal fluid leakage
Check other pressures (above
items); also check control
module mounting bolts;
lubrication valve and spring
(refer to transmission Service
Manual)
Broken or damaged converter
regulator retaining pin
Replace damaged or broken parts
(refer to transmission Service
Manual)
Cooler lines restricted or leaking Check for kinks, leakage; reroute
or replace lines as necessary
Lubrication valve sticking Replace lubrication valve
Cooler plugged Clean or replace cooler
Faulty gauge Repair or replace gauge
ABNORMAL STALL SPEEDS
(Stall In First Range — 6-Speed)
(Stall In Second Range — 7-Speed)
A.
High Stall Speeds
Not in gear Select
D
(Drive)
Low fluid level, aerated fluid Add fluid to proper level (refer to
Mechanic’s Tips for proper
dipstick calibration)
Incorrect torque converter Replace torque converter (refer to
transmission Service Manual)
Clutch pressure low Refer to Low Pressure section
and Appendix B
C1 or C5 clutch slipping.
(7-speed, 2nd range start)
(6-speed, 1st range start)
Note:
Use the diagnostic tool to
check turbine speed
Rebuild C1 or C5 clutch (refer to
transmission Service Manual)
Higher power engine Confirm proper engine match
B.
Low Stall Speeds
Engine not performing efficiently
(may be due to plugged or
restricted injectors, high altitude
conditions, dirty air filters, out of
time, throttle linkage, electronic
engine controls problem)
Refer to Vehicle Engine
Manufacturer’s Manual or
Vehicle Service Manual
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause Suggested Remedy
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