On a modern machine several control modules exchange data over the CAN network all the time. Engine, transmission, hydraulics and cab all depend on each other.
When communication fails, faults appear in several places at once. With original diagnostic tools, a multimeter and an oscilloscope we check modules, network and wiring until we find the source.
The cause is often simple: a damaged cable, a corroded connector, a bad ground or the terminating resistor. Sometimes one faulty module floods the whole network.
Signs of a communication problem
- Several faults at once from different systems
- The display or armrest switches off or stops responding
- The diagnostic tool cannot see a module
- The fault appears with moisture, vibration or after washing