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ENGINE AR-COMPLETE 1399830 - Caterpillar

1399830 ENGINE AR-COMPLETE Caterpillar parts C-12 ENGINE
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Caterpillar 1399830 ENGINE AR-COMPLETE

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Compatible equipment models: 1399830:

TRUCK ENGINE  C-12   Caterpillar
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Electronic components used in the vibratory control system communicate through two different controller area networks: CAN "0" and CAN "1". Each CAN is a two-wire differential serial bus. Each bus consists of two copper wires twisted as a pair, with approximately 40 twists per meter (1 twist per inch). One wire of the pair is designated as CAN High (+), and the other wire is designated as CAN Low (-). CAN "0" carries the bulk of the communication between the operator interface components and the electronic control modules on the machine and engine. CAN "1" transfers information between the CAAC ECMs and machine ECM number-one.Each CAN circuit requires a 120 ohm termination resistor between the CAN High wire and the CAN Low wire at either end of the circuit. The termination resistors maintain the total circuit impedance at 60 ohms. These resistors reduce noise over the CAN by tuning the signals sent through the lines. When the CAN resistors are functioning properly, the rise and fall times of each bit transmission through the CAN appear to be vertical (without jitter) .The location of each termination resistor is as follows:
CAN "0" resistor "C13" (1) is part of the cab harness. This resistor is located inside the right console, near the propel lever.
CAN "1" resistor "C20" (2) is part of the operator platform harness. This resistor is located on the operator platform.
CAN "1" resistor "C6" (3) is part of the main machine harness. This resistor is located at the right rear corner of the machine, near the rear CAAC ECM.
CAN "0" resistor "C44" (4) is part of the main machine harness. This resistor is located at the upper, front corner of the engine compartment.Information is transferred through the bus using a differential voltage between CAN High and CAN Low. Voltages of both CAN High and CAN Low are relative to ground. The CAN bus carries signals in opposite directions in order to minimize noise interruption. As one phase of the bus enters a rise time for bit transmission, the other phase enters a fall time for bit transmission. The resultant waveform of a properly operating CAN looks like a box-shaped signal when viewed on an oscilloscope. CAN busses can have one of the two following logic states: dominant (logic state "0") and recessive (logic state "1"). These states provide the binary logic the ECMs read in the signals sent through the CAN. Typically, the voltage level associated with the recessive state is 2.5 V for CAN High and CAN Low. Voltage levels for dominant information are 3.5 V for CAN high and 1.5 V for CAN low. The voltage level on the bus is recessive (2.5 V) when the bus is idle.Many faults on a CAN bus are due to physical problems, such as:
A poorly terminated bus
Poor signal quality due to high electromagnetic interference
Incorrectly installed cables
Dirty or corroded pins and socketsA digital multimeter can test data link circuits for data communications activity and circuit faults. The DC voltage function on

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