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WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
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
WARNING!
property, personal injury, or loss of life. ALLISON TRANSMISSION IS NOT
LIABLE FOR THE CONSEQUENCES ASSOCIATED WITH MISWIRING
OR UNINTENDED USE OF THESE FEATURES.
H.
ENGINE BRAKE/PRESELECT REQUEST AND ENGINE BRAKE ENABLE
(COMPRESSION BRAKE)
USES: Used with single-level compression brakes to signal 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 lockup OFF.
VARIABLES TO SPECIFY: Preselect range. Standard value is fourth range.
VOCATIONS: Various
SWITCHED
ENGINE THROTTLE
POWER
SWITCH
NC
D2
V
ENGINE
E2
V-3
COM
BRAKE
NO
DASH
BRAKE
WIRE 132
ON
LIGHT
B1
OPTIONAL
ENGINE BRAKE
CUSTOMER-FURNISHED ENABLE OUPUT
VIM
ECU
VIW CONNECTOR(S)
Relay shown de-energized
WIRE 143H
NOTE: This switch is part of the engine brake system and
S-32
SIGNAL RETURN
provides an indication when the engine is at closed throttle.
This switch, or an equivalent control feature, is REQUIRED
ENGINE BRAKE
S S-26
for all installations.
DASH SWITCH
NOTE: The engine brake must provide a low engine speed
WIRE 169
shutoff feature, set to disable the brake at a speed slightly
ENGINE BRAKE AND
higher than idle rpm.
PRESELECT REQUEST
NOTE: If the engine brake is an inductive load, it must
be diode suppressed.
V04865
Figure H5. Engine Brake/Preselect Request and Engine Brake Enable (Compression Brake)
0021 00177

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