Data Sheet

Q4000 Technical Data Sheet
Document 1135-0902, REV K 22
Inductive Load Use Warning: If an inductive load such as a relay is used, it can generate a spike
voltage across it. If that exceeds 60 volts peak, the spike must be limited. Check if the external inductive load
is internally limited. If not, a clamp diode across the inductive load with the cathode towards the positive input
lead must be used.
J1939 4.1.3
The J1939 bus connection is used on Heavy Truck Engine Computers to obtain engine and other subsystem
parameters such as Oil Pressure and Fuel Level. See the SAE J1850/1939 specification for additional
information on this engine bus.
• CAN Bus with J1939 stack interface
• This bus is connected on pins 23 (CAN_H) and 24 (CAN_L)