Validation andTroubleshooting C
6. If the bus impedance reads:
120Ω, then one terminator is faulty
0Ω, then both terminators are faulty
To identify a faulty terminator, check that the installed CAN terminators
(P/N0395-9210 and P/N2114-2116) each have a resistance of approximately
120Ω
Confirm voltages:
1. Power up the system.
2. Use a multimeter to check that there is ~2 to 3 volts between the ground pin F
and pins C or D.
If the voltage is 0, the CAN bus line is grounded, probably due to a machine
voltage short.
Confirm continuity:
Use a multimeter to check continuity through the harnesses.
C.10 Related information
For more troubleshooting information, refer to the:
l GCS900 Grade Control System for Excavators Operator's Manual
l GCS900 Grade Control System Reference Manual
To identify connector pinouts, refer to the GCS Series Cable Diagrams Manual.
GCS900 Grade Control System for Excavators Installation Manual 169
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