W T E C I I I E L E C T R O N I C C O N T R O L S T R O U B L E S H O O T I N G M A N U A L
APPENDIX H INPUT/OUTPUT FUNCTIONS
These schematics show the intended use of the specified controls features which
have been validated in the configuration shown. Any miswiring or use of these
features which differs from that shown could result in damage to equipment or
property, personal injury, or loss of life. ALLISON TRANSMISSION IS NOT
LIABLE FOR THE CONSEQUENCES ASSOCIATED WITH MISWIRING
OR UNINTENDED USE OF THESE FEATURES.
ENGINE BRAKE/PRESELECT REQUEST AND ENGINE BRAKE ENABLE
(EXHAUST BRAKE SPECIAL)
USES: Used with engine brakes to provide a signal to the ECU that the brake is active and to provide increased
braking by preselecting a lower range. Also prevents engagement of engine brake with throttle > 0 or
VARIABLES TO SPECIFY:
Preselect range. Standard value is second range.
Figure H6. Engine Brake/Preselect Request and Engine Brake Enable (Exhaust Brake Special)