Copyright © 1998 General Motors Corp.
P–11
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
APPENDIX P — INPUT/OUTPUT FUNCTIONS
WARNING!
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.
FIRE TRUCK PUMP MODE
USES:
Facilitates engagement of split shaft PTO and shifts transmission to fourth range lockup.
VARIABLES TO SPECIFY:
None
VOCATIONS:
Fire Truck Pumpers
SYSTEM OPERATION
OPERATOR ACTION — System Response
TO ENGAGE:
1.
SELECT NEUTRAL
— Transmission shifts to Neutral.
2.
APPLY PARKING BRAKE
— None
3.
SELECT PUMP
— Turns on “Pump Mode Requested” light. Stops output shaft rotation. When split-shaft
engages, PPE signal and “Pump Engaged” light are turned on. Transmission output unlocks.
4.
SELECT DRIVE
— Transmission shifts to fourth lockup. “OK To Pump” light is turned on.
TO DISENGAGE:
1.
SELECT NEUTRAL
— Transmission shifts to Neutral if output rpm < 1000.
2.
SELECT ROAD MODE
— Stops output shaft rotation. PTO disengages. Transmission shifts back to Neutral.
Figure P–11. Fire Truck Pump Mode
WARNING!
If this function is enabled in the shift calibration, the function MUST be integrated
into the vehicle wiring. If the function is available in the shift calibration but will
not be used in the vehicle, it MUST be disabled in the calibration.
V05016
WIRE 118
FIRE TRUCK
PUMP MODE INPUT
PARKING BRAKE
PRESSURE SWITCH
Switch is closed
when brakes are on
POSITIVE PUMP
ENGAGEMENT
(PPE) SWITCH
Switch is closed
when pump
is engaged
WIRE 161B SIGNAL GROUND
WIRE 114 RANGE INDICATOR = 4th
WIRE 117 PUMP ENABLE
DASH SWITCH
Open: Road
Closed: Pump
Relay shown de-energized
PUMP
ENGAGED
SWITCHED
POWER
A2
NC
COM
VIM
NO
A3
OK TO
PUMP
PUMP MODE
REQUESTED
SPLIT-
SHAFT
PTO
AIR
13
2
16
ECU
VIW
CONNECTOR
Содержание B 300
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