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Page Title:
"Vehicle Speed Cal (J1939-Trans)" |
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 66
TM 9-2320-312-24-2
Troubleshooting Section
The "Vehicle Speed Cal (J1939-ABS)" is used to
Table 133
calculate vehicle speed by using the input from
Manufacturer
Minimum
Maximum
Default
the wheel speed. The data from the wheel speed
2485
238080
GM
19884 PPKM
is transmitted via the J1939 data link. The "Vehicle
PPKM
PPKM
(32000 PPM)
Speed Input" parameter must be programmed to
(4000
(384000
"Vehicle Speed Cal J1939-ABS". The manufacturer
PPM)
PPM)
of the ABS system must transmit tire revolutions per
mile that is based on the tire size. If the tire size is
2485
238080
Other
"Not
changed from tire size that is programmed in the
PPKM
PPKM
Programmed"
ABS system, the "Vehicle Speed Cal (J1939-ABS)"
(4000
(384000
PPM)
PPM)
must be changed. The value that is contained in
the "Vehicle Speed Cal (J1939-ABS)" parameter is
a ratio. If the actual tire size is equal to the tire size
"Vehicle Speed Cal (J1939-Trans)"
that is programmed in the ABS system, the "Vehicle
Speed Cal (J1939-ABS)" parameter will be "1". The
The "Vehicle Speed Cal (J1939-Trans)" is used
ratio can be found by dividing the tire revolutions
when the ECM is configured to use the speed of
per mile that is transmitted by the ABS system by
the transmission output shaft in order to calculate
the actual tire revolutions per mile. Contact the
vehicle speed. The "Vehicle Speed Input" parameter
manufacturer of the ABS system in order to verify
must be programmed to "J1939-Trans". This value
that this message is supported.
represents the revolution of the transmission output
shaft as revolutions per kilometer (revolutions per
If the "Vehicle Speed Input" parameter is
mile). This parameter must be programmed. If
programmed to "Vehicle Speed Cal J1939-ABS",
this parameter is not programmed, 253-02 Check
this parameter must be programmed. If this
Customer or System Parameters (56) will become
parameter is not programmed, 253-02 Check
active. This parameter affects the cruise control and
Customer or System Parameters (56) will become
the ECM speedometer signal. Also, this parameter
active. This parameter affects the cruise control and
can affect the PTO operation, extended idle and
the ECM speedometer signal. Also, this parameter
trip totals.
can affect the PTO operation, extended idle and
trip totals.
Table 134
Table 135
Minimum
Maximum
Default
Minimum
Maximum
Default
43000
0 revolutions
"Not Programmed"
revolutions
per km (0
0
6.550
"Not Programmed"
per km (65000
revolutions
revolutions per
per mile)
mile)
"Vehicle Speed Limit (VSL)"
The "Vehicle Speed Limit" (VSL) is the maximum
"Vehicle Speed Cal (J1939 ABS)"
vehicle speed that is allowed by the ECM. The ECM
will shut off fuel above this speed. An inexperienced
OCT01 and newer Personality Modules.
driver may think that something is wrong with the
engine because the ECM will not fuel the engine
above this vehicle speed limit. Vehicle speed
limiting allows the implementation of a gear fast/run
slow specification for the truck. The gear fast/run
slow specification for the truck improves fuel
economy while the parameter for the vehicle speed
limit limits the maximum vehicle speed of the truck.
Table 136
Manufacturer
Minimum
Maximum
Default
GM
48 km/h
121 km/h
121 km/h
(30 mph)
(75 mph)
(75 mph)
Other
48 km/h
204 km/h
204 km/h
(30 mph)
(127 mph)
(127
mph)
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