8–12 Copyright © 1998 General Motors Corp.
GENERAL TROUBLESHOOTING OF PERFORMANCE COMPLAINTS
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
ABNORMAL STALL SPEEDS
(Stall In First Range — 6-Speed)
(Stall In Second Range — 7-Speed)
(cont’d)
Clutch partially applied
Check clutch pressures to
identify cause of partial apply.
Rebuild clutch if no pressure
found to cause partial apply. If
pressure found in clutch, find
cause of pressure. (refer to
Appendix B and transmission
Service Manual)
Stall speeds of 66 percent of
normal implies freewheeling
stator
Replace or rebuild converter
assembly (refer to transmission
Service Manual)
Incorrect torque converter Replace torque converter (refer to
transmission Service Manual)
OVERHEATING IN ALL
RANGES
Aerated fluid — incorrect fluid
level
Adjust fluid to proper level,
check for defective pump (refer
to Mechanic’s Tips and
transmission Service Manual)
Air flow to cooler obstructed Remove air flow obstruction
Engine overheat Correct overheat situation (refer
to Vehicle Service Manual)
Inaccurate temperature gauge or
sending unit
Replace gauge and/or sending
unit
Inaccurate sump temperature
sensor
Replace temperature sensor or
internal harness (refer to
transmission Service Manual)
Transmission cooler lines
reversed
Connect cooler lines properly (oil
and water should flow in opposite
directions)
Fluid cooler lines restricted Remove restrictions, clean or
replace lines (refer to Vehicle
Service Manual)
Torque converter (wrong
converter, no lockup, stuck stator,
or slipping stator)
Replace or repair converter
assembly. (refer to transmission
Service Manual)
Note:
Stuck stator will not allow
cool down in neutral
Cooler flow loss due to internal
leakage
Overhaul transmission (refer to
transmission Service Manual)
Retarder stays “on” See Retarder Performance
Complaints earlier in this table
Table 8–1. Troubleshooting Performance Complaints
(cont’d)
Problem
Probable Cause Suggested Remedy
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