PULLEY-FAN DRIVE 7N1275 - Caterpillar

"Vehicle Speed Calibration"
The Engine Control Module (ECM) uses the value of this parameter in order to translate the vehicle speed signal into kilometers per hour (miles per hour). This parameter is programmed in pulses per kilometer (PPKM) or pulses per mile (PPM). This parameter must be programmed. This parameter affects the cruise control and the ECM speedometer signal. Also, this parameter can affect the PTO operation, extended idle and trip totals.
Table 1
Default Minimum Maximum
Not Programmed 2485 PPKM (4000 PPM) 93226 PPKM (150000 PPM) "Vehicle Speed Cal (J1939 - Trans)"
The "Vehicle Speed Cal (J1939 - Trans)" is used when the ECM is configured to use the speed of the transmission output shaft in order to calculate vehicle speed. The "Vehicle Speed Input" parameter must be programmed to "Vehicle Speed Cal J1939 - Trans". This value represents the revolution of the transmission output shaft as revolutions per kilometer (revolutions per mile). This parameter must be programmed. This parameter affects the cruise control and the ECM speedometer signal. Also, this parameter can affect the PTO operation, extended idle and trip totals.
Table 2
Default Minimum Maximum
Not Programmed 0 43000 revolutions per km
65000 revolutions per mile "Vehicle Speed Cal (J1939 - ABS)"
The "Vehicle Speed Cal (J1939 - ABS)" is used to calculate vehicle speed by using the input from the wheel speed. The data from the wheel speed is transmitted via the J1939 data link. The "Vehicle Speed Input" parameter must be programmed to "Vehicle Speed Cal J1939 - ABS". The manufacturer of the ABS must transmit tire revolutions per mile that is based on the tire size. If the tire size is changed from the tire size that is programmed in the ABS the "Vehicle Speed Cal (J1939 - ABS)" must be changed.The value of this parameter is a ratio. If the actual tire size is equal to the tire size that is programmed in the ABS, the "Vehicle Speed Cal (J1939 - ABS)" parameter will be "1". Determine the ratio by dividing the tire revolutions per mile that is transmitted by the ABS by the actual tire revolutions per mile. Contact the manufacturer of the ABS in order to verify that this message is supported.If the "Vehicle Speed Input" parameter is programmed to "Vehicle Speed Cal J1939 - ABS", this parameter must be programmed. If this parameter is not programmed, a 630-2 code is activated. This parameter affects the cruise control and the ECM speedometer signal. Also, this parameter can affect the PTO operation, extended idle and trip totals.
Table 3
Default Minimum Maximum
Not Programmed 0 6.550 "Vehicle Speed Limit"
The "Vehicle Speed Limit" is the maximum vehicle speed that is allowed by the ECM. The ECM disables fuel flow above this speed. An inexperienced driver may think that something is wrong with the engine because the ECM does 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