CYLINDER GP 3161490 - Caterpillar

Illustration 7 g02642599
Under Left Operator Station Seat (17) Left operator ECM (18) Connector "J1" (19) Connector "J2"Left operator ECM (17) is located under the left operator seat. This ECM has two 70 pin connectors, connector "J1" (18) and connector "J2" (19). Left operator ECM (17) monitors input devices which are located in the left operator station. This ECM communicates with the other ECMs through the Cat Data Link.
Illustration 8 g02642600
Left Operator ECM Connector "J1" The above illustration shows the terminals of connector "J1" of left operator ECM (17) that are part of the propel control system. Each terminal is described by type and function.
Illustration 9 g02642601
Left Operator ECM Connector "J2"The above illustration shows the terminals of connector "J2" of left operator ECM (17) that are part of the propel control system. Each terminal is described by type and function.Right Operator ECM
Illustration 10 g02642602
Under Right Operator Station Seat (20) Right operator ECM (21) Connector "J1" (22) Connector "J2"Right operator ECM (20) is located under the right operator seat. This ECM has two 70 pin connectors, connector "J1" (21) and connector "J2" (22). Right operator ECM (20) monitors input devices which are located in the right operator station. This ECM communicates with the other ECMs through the Cat Data Link.
Illustration 11 g02642603
Right Operator ECM Connector "J1"The above illustration shows the terminals of connector "J1" of right operator ECM (20) that are part of the propel control system. Each terminal is described by type and function.
Illustration 12 g02642604
Right Operator ECM Connector "J2"The above illustration shows the terminals of connector "J2" of right operator ECM (20) that are part of the propel control system. Each terminal is described by type and function.
Illustration 13 g02642605
Center Rear of Machine (23) CAN resistorThe electronic control system is equipped with two CAN resistors. One CAN resistor (not shown) is mounted to the right side of the engine block near the engine ECM. Second CAN resistor (23) is mounted to the machine frame under the operator platform.In order to prevent data loss in the communication lines, a termination resistor is required at each end of the CAN bus. The CAN resistors act as termination resistors. The CAN resistors absorb unwanted noise in the communication system which can result in abnormal machine operation.Differences in materials along the CAN bus can cause data pulses in the bus to reflect back through the bus. This reflection, also known as "jitter", creates unwanted noise in the CAN bus. Jitter in the communication lines between computers can distort the original data signals. The distortion can result in data loss. Data in the CAN bus can also be contaminated with radio frequency interference (RFI). This interference can be caused by a number of devices which operate on or near the machine. RFI creates noise in the communication lines which can also distort the original data signals and cause data loss.Note: If the machine is equipped with a screed, this CAN resistor is removed from the circuit, and a CAN resistor near the screed ECM becomes the second termination resistor. For