DVOM/MOPAR® Scope Testing

Refer to the following steps to measure and record the voltage and resistance on the CAN Bus circuits:

DVOM TESTING: 

1. With the ignition ON, measure and record the VOLTAGE  on the CAN Bus (+) circuit, making sure the ground lead is connected to chassis ground.
2. With the ignition ON, measure and record the VOLTAGE  on the CAN Bus (-) circuit, making sure the ground lead is connected to chassis ground.
3. Disconnect the Main Battery, and Auxiliary Battery (if equipped). Measure and record the RESISTANCE  on the CAN Bus (+) and (-) circuits.
4. Compare the recorded CAN Bus measurements with the above CAN BUS VOLTAGES table and the CAN BUS TERMINATION RESISTOR RESISTANCE table.

Referring to the appropriate CAN Bus circuit failures below can help determine which direction the fault exists on the CAN Bus:

• CAN Bus (+) or (-) Circuit Open:  The measurements with the incorrect voltage and less than 120.0 Ohms of resistance indicates which CAN Bus circuit is open.
• CAN Bus (+) or (-) Circuit Short To Ground:  Measurements with the incorrect voltage and the least amount of resistance indicates which CAN Bus circuit is shorted to ground.
• CAN Bus (+) or (-) Circuit Short To Voltage:  Measurements with the incorrect voltage indicates which CAN Bus circuit is shorted to voltage.
• CAN Bus (+) or (-) Circuits Shorted Together:  Measurements with equal voltages and the least amount of resistance indicates the CAN Bus circuits are shorted together.

MOPAR® SCOPE TESTING: 

Courtesy of CHRYSLER GROUP, LLC