Method and apparatus for short fault detection in a controller area network

1. A controller area network (CAN) comprising:

a CAN bus including a CAN-H wire and a CAN-L wire;

a pair of CAN bus terminators located at opposite ends of the CAN bus, each terminator having a corresponding known terminator resistance value;

a plurality of nodes including controllers wherein at least one of said controllers comprises a monitoring controller; and

said monitoring controller comprising:

a CAN transceiver signally connected to the CAN-H wire through a shunt resistor having a known resistance,

a CAN-H wire voltage monitor to monitor CAN-H voltage,

a CAN-L wire voltage monitor to monitor CAN-L voltage,

a shunt resistor voltage monitor to monitor voltage across said shunt resistor,

a processor and memory, to:

calculate a total resistance of the CAN bus in accordance with the following relationship:

R

T

=

V

HL

V

S

⁢

R

S

wherein R T is total resistance of the CAN bus,

 R S is the resistance of the shunt resistor,

 V S is voltage across said shunt resistor,

 V HL is the voltage difference between CAN-H voltage and CAN-L voltage;

detect a wire short fault in the CAN bus based upon said total resistance of the CAN bus; and

determine a location of said wire short fault in the CAN bus based upon said total resistance of the CAN bus.

2. The controller area network (CAN) of claim 1 , wherein determine a location of said wire short fault in the CAN bus comprises:

reference a predetermined table correlating CAN bus location to said total resistance of the CAN bus.

3. The controller area network (CAN) of claim 1 , wherein said voltages are filtered.