CYLINDER BLOCK GP 3761569 - Caterpillar

"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 economy while the parameter for the vehicle speed limit limits the maximum vehicle speed of the truck.Note: The driver reward can be used to automatically adjust the VSL according to the driver's operating techniques.
Table 4
Default Minimum Maximum
121 km/h (75 mph) 48 km/h (30 mph) 204 km/h (127 mph) "VSL Protection"
The "VSL Protection" is the maximum engine rpm when there is a problem with the vehicle speed signal that is detected by the ECM. The ECM limits the engine speed to the value of this parameter when the ECM senses no vehicle speed signal, and there is a load on the engine. This feature prevents tampering by limiting engine speed if the ECM does not detect a valid vehicle speed signal.Note: "VSL Protection" is disabled when this parameter is programmed to the programmed TEL rpm and the vehicle speed sensor is disconnected.
Table 5
Default Minimum Maximum
1700 rpm 1000 rpm TEL rpm "Tachometer Calibration"
The ECM uses the value of this parameter in order to translate the engine speed signal into revolutions per minute for a tachometer. The "Tachometer Calibration" is programmed in pulses per revolution (PPR). The programmable range is from 2.0 PPR