Can - Multiplexing Worksheet

Can Multiplexing Worksheet

2003 Range Rover

I located a twisted pair on the range rover on the ABS module and back probed into the wires.

This is a waveform of a CAN System  on the ABS Module of a 2003 Range Rover, Voltage per division is 1 volt, Time per division is 20 micro seconds. This waveform shows that the ABS Module is communicating in the CAN System.

Aliasing is: If your time constant is too large, your wave pattern would just be a straight line. I know these waveforms is not aliasing and time constant is really small.

DC voltage setting is good for analysing, this is because the signals a re PWN controlled therefore it wont go below or so we dont need a AC setting.

Scan Tool Observations

On the 2003 Range Rover, i plugged in the Auto-Boss Scan tool. This scan tool has many different functions such as live data, actuator tests and fault codes. Using the scan tool i was able to find different systems controlled by CAN.

Such as:

Radio

Park Distance Control

Steering Angle Sensor

Multi-Function Steering Wheel

On Board Controls

Switching Center Control

Light Switching Control

Vehicle Immobilizer

Cruise Control

Engine Damper Control

Wiring Diagram Exercise 

Multiplexing Network

Dividing the system is helpful because you are able to test each half of the CAN-BUS to locate and diagnose the fault.

A system that goes to sleep after a short while is:

Body Car System

Awake - 2.6 Volts

Asleep - 0.5 Volts