Peak voltage is highest average voltage that has occurred since last cold boot.
Peak CAN High and Peak CAN Low voltages normally range between 1.7 and 3.3 Volts. Voltage measurements are averaged for each second.
Since multimeters typically read average voltages, do not compare multimeter readings with these values.
CAN High Voltage
Value should normally be in between 2.5 and 3.5 Volts. Measured on a machine that is running, it will usually range between 2.7 and 3.3 Volts.
CAN Low Voltage
Value should normally be in between 1.5 and 2.5 Volts. Measured on a machine that is running, it will usually range between 1.7 and 2.3 Volts.
If voltages are outside these ranges, measure resistance between CAN high and CAN low with a multimeter.
Resistance:
|
60 Ω |
Both terminators are working correctly. |
|
120 Ω |
One terminator on the CANBUS is not working correctly. |
|
0 Ω or not defined |
Both terminators on the CANBUS are not working correctly. |
Due to fast voltage changes, a multimeter will not show either a constant voltage or exact voltage on CAN high or CAN low. An oscilloscope is needed to see the exact changes happening on CANBUS.