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
7–2
Copyright © 1998 General Motors Corp.
INPUT AND OUTPUT FUNCTIONS
The following input functions inhibit direction change shifts (forward to reverse or reverse to forward):
•
Auxiliary Function Range Inhibit (standard)
•
Auxiliary Function Range Inhibit (special)
•
Quick-to-Neutral, Pump
•
Automatic Neutral for PTO (standard)
•
Automatic Neutral for PTO (special)
•
Automatic Neutral at Stop
•
Reverse Enable
•
Automatic Neutral for Refuse Packers
The following input functions lock the transmission in fourth range:
•
Fire Truck Pump Mode
•
Fourth Lockup Pump Mode
The following input functions preselect a lower range:
•
Engine Brake and Preselect Request (Standard)
•
Engine Brake and Preselect Request (Special)
The following input functions inhibit upshifts:
•
D1 Selection
•
Auxiliary Hold
The following input functions inhibit lockup shifts:
•
Manual Lockup
•
Antilock Brake response
The following input function inhibits range and lockup shifts at high horsepower:
•
Shift Enable/Shift in Process (Oil Field Application)
The following functions are general restrictions to normal operation:
•
High Input Speed causes neutral to range inhibit
•
Cold Oil restricts operation to Neutral Range only
•
Medium Cold Oil causes operation confined to
R
,
N
, and 2nd range start
•
Hot Oil restricts operation to 4th range maximum
•
Special Pattern Logic
•
Wheel Lock
•
High Throttle
•
Power loss to the ECU restricts operation to certain ranges
