Testing With The MOPAR® Diagnostic Star Connector Kit And MOPAR® Scope

The Star Connector locations must  be determined before proceeding to diagnose the CAN Bus. To help determine the flow of the CAN Bus network, use the appropriate SYSTEM WIRING DIAGRAMS, Component Views, Connector End Views and the Star Connector terminal information on the back-side of the (special tool #2073400080, Kit, PowerNet / CUSW CAN BUS Diagnostic Tool).

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CAN BUS DIAGNOSTIC TOOL STRATEGIES

• There are several strategies for testing the Powernet / CUSW CAN Bus when multiple modules will not communicate with CAN C or IHS. Understanding the strategies below, along with the above 2-Pin and 3-Pin CAN Bus Diagnostic Tool descriptions, will help with diagnosing a CAN Bus equipped with one or more Star Connectors.
• The testing tools ports are configured to the CAN C and IHS Bus (+) and (-) circuits and can be used to read CAN Bus measurements with a DVOM or analyze waveform patterns with an Oscilloscope. For best results, allow the network and scan tool to update before opening or closing other switches.

FAULTY ECU CONNECTED

• When the toggle switch is in the "CONNECTED"  position, the Powernet / CUSW CAN Bus Diagnostic Tool is a pass-through for CAN communication.

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TWO STAR CONNECTOR CAN BUS

1. With the ignition ON, view the scan tool topology screen and note any module(s) in Red.
2. Using the Bus Topology Locations in Wiring Diagrams, locate the single Star Connector closest to the module(s) in Red.
3. Using the Location Views in the Wiring Diagrams, locate the Star Connector on the vehicle where the Powernet / CUSW CAN Bus Diagnostic Tool will be connected.
4. Using the Connector End Views in Wiring Diagrams, determine the CAN Bus circuits to be tested.
5. Using the Connector End Views in Wiring Diagrams, match the CAN Bus connector terminals with the Star Connector terminal information on the back-side of the Powernet / CUSW CAN Bus Diagnostic Tool.
6. According to the Basic Powernet / CUSW CAN Bus image example shown above, disconnect the 2-Pin connector of the suspect ECU from the Star Connector.
7. Connect the 2-Pin CAN Bus Diagnostic Tool to the Star Connector in place of the suspect ECU.
8. *  Connect the suspect ECU to the 2-Pin CAN Bus Diagnostic Tool. * 
9. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from DISCONNECT  to CONNECTED  . * 
10. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
11. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from CONNECTED  to DISCONNECT  . * 
12. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
13. *  Check the CAN bus wiring for shorts or opens and repair or replace as needed. If no trouble found proceed to the next step. * 
14. If applicable, replace the ECU when disconnected from the CAN which allowed the CAN bus activity status to return to normal communication. If not applicable, proceed to the next step.
15. If the CAN bus activity does not return to normal communication, repeat steps 1 through 13 to all ECUs connected to the Star Connector before proceeding to the next step.
16. If the CAN bus activity does not return to normal communication, after testing all ECUs connected to the Star Connector proceed to the testing below for a FAULTY STAR CONNECTOR  .

ONE STAR CONNECTOR CAN BUS

1. With the ignition ON, view the scan tool topology screen and note any module(s) in Red.
2. Using the Bus Topology Locations in Wiring Diagrams, locate the single Star Connector closest to the module(s) in Red.
3. Using the Location Views in the Wiring Diagrams, locate the Star Connector on the vehicle where the Powernet / CUSW CAN Bus Diagnostic Tool will be connected.
4. Using the Connector End Views in Wiring Diagrams, determine the CAN Bus circuits to be tested.
5. Using the Connector End Views in Wiring Diagrams, match the CAN Bus connector terminals with the Star Connector terminal information on the back-side of the Powernet / CUSW CAN Bus Diagnostic Tool.
6. According to the Basic Powernet / CUSW CAN Bus image example shown above, disconnect the 2-Pin connector of the suspect ECU from the Star Connector.
7. Connect the 2-Pin CAN Bus Diagnostic Tool to the Star Connector in place of the suspect ECU.
8. *  Connect the suspect ECU to the 2-Pin CAN Bus Diagnostic Tool. * 
9. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from DISCONNECT  to CONNECTED  . * 
10. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
11. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from CONNECTED  to DISCONNECT  . * 
12. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
13. *  Check the CAN bus wiring for shorts or opens and repair or replace as needed. If no trouble found proceed to the next step. * 
14. If applicable, replace the ECU when disconnected from the CAN which allowed the CAN bus activity status to return to normal communication. If not applicable, proceed to the next step.
15. If the CAN bus activity does not return to normal communication, repeat steps 1 through 13 to all ECUs connected to the Star Connector before proceeding to the next step.
16. If the CAN bus activity does not return to normal communication, after testing all ECUs connected to the Star Connector - replace Star Connector.

FAULTY STAR CONNECTOR

• When a switch is toggled in the "CONNECTED"  position, the Powernet / CUSW CAN Bus Diagnostic Tool is a pass-through for CAN communication.

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TWO STAR CONNECTOR CAN BUS

1. With the ignition ON, view the scan tool topology screen and note any module(s) in Red.
2. Using the Bus Topology Locations in Wiring Diagrams, locate the single Star Connector closest to the module(s) in Red.
3. Using the Location Views in the Wiring Diagrams, locate the Star Connector on the vehicle where the Powernet / CUSW CAN Bus Diagnostic Tool will be connected.
4. Using the Connector End Views in Wiring Diagrams, determine the CAN Bus circuits to be tested.
5. Using the Connector End Views in Wiring Diagrams, match the CAN Bus connector terminals with the Star Connector terminal information on the back-side of the Powernet / CUSW CAN Bus Diagnostic Tool.
6. According to the Basic Powernet / CUSW CAN Bus image example shown above, disconnect the 3-Pin connector of the Star Connector that is the furthest from the Gateway.
7. Connect the 3-Pin CAN Bus Diagnostic Tool to the vehicle harness side in place of the suspect Star Connector.
8. *  Connect the suspect Star Connector to the 3-Pin CAN Bus Diagnostic Tool. * 
   NOTE:

   Do NOT have both toggle switches in the DISCONNECT  position, as this will change the resistance of the tool from 120 Ohms to 60 Ohms resistance, and hinder CAN communication.

9. *  Toggle the switch on the 3-Pin CAN Bus Diagnostic Tool from DISCONNECT  to CONNECTED  . * 
10. *  It may be needed to toggle the switch on the 3-Pin CAN Bus Diagnostic Tool from CONNECTED  to DISCONNECT  . * 
11. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
12. *  Check the CAN bus wiring for shorts or opens and repair or replace as needed. If no trouble found proceed to the next step. * 
13. If the CAN bus activity does not return to normal communication, after testing the Star Connector - replace Star Connector.

ONE STAR CONNECTOR CAN BUS

1. With the ignition ON, view the scan tool topology screen and note any module(s) in Red.
2. Using the Bus Topology Locations in Wiring Diagrams, locate the single Star Connector closest to the module(s) in Red.
3. Using the Location Views in the Wiring Diagrams, locate the Star Connector on the vehicle where the Powernet / CUSW CAN Bus Diagnostic Tool will be connected.
4. Using the Connector End Views in Wiring Diagrams, determine the CAN Bus circuits to be tested.
5. Using the Connector End Views in Wiring Diagrams, match the CAN Bus connector terminals with the Star Connector terminal information on the back-side of the Powernet / CUSW CAN Bus Diagnostic Tool.
6. According to the Basic Powernet / CUSW CAN Bus image example shown above, disconnect the 2-Pin connector of the suspect ECU from the Star Connector.
7. Connect the 2-Pin CAN Bus Diagnostic Tool to the Star Connector in place of the suspect ECU.
8. *  Connect the suspect ECU to the 2-Pin CAN Bus Diagnostic Tool. * 
9. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from DISCONNECT  to CONNECTED  . * 
10. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
11. *  Toggle the switch on the 2-Pin CAN Bus Diagnostic Tool from CONNECTED  to DISCONNECT  . * 
12. *  Check the CAN bus activity status of the suspect ECU with the diagnostic scan tool. * 
13. *  Check the CAN bus wiring for shorts or opens and repair or replace as needed. If no trouble found proceed to the next step. * 
14. If applicable, replace the ECU when disconnected from the CAN which allowed the CAN bus activity status to return to normal communication. If not applicable, proceed to the next step.
15. If the CAN bus activity does not return to normal communication, repeat steps 1 through 13 to all ECUs connected to the Star Connector before proceeding to the next step.
16. If the CAN bus activity does not return to normal communication, after testing all ECUs connected to the Star Connector - replace Star Connector.

*DVOM / OSCILLOSCOPE TESTING ANALYSIS* 

• Disconnecting and Connecting the switches on the 3-Pin Powernet / CUSW CAN Bus Diagnostic Tools can be used when measuring the voltage and resistance on the CAN Bus circuits. Use the appropriate SYSTEM WIRING DIAGRAMS and the Star Connector terminal information on the back-side of the Powernet / CUSW CAN Bus Diagnostic Tools, to further analyze and determine if a module or CAN Bus circuit within the Star Connector being used for testing is the cause of the CAN Bus failure.

The 3-Pin resistance table below shows the resistance values the 3-pin CAN Bus diagnostic tool will add to the CAN being tested.

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Perform the following steps to measure and record the voltage and resistance values of CAN Bus circuits using a DVOM or Oscilloscope:

1. Using the Powernet / CUSW CAN Bus Diagnostic Tools determine the DISCONNECT  to CONNECTED  flow of the CAN Bus network before proceeding.
2. With the ignition ON, use a DVOM / Oscilloscope to measure and record the voltage  on the CAN Bus (+) circuit at connection port 1  of the Powernet / CUSW CAN Bus Diagnostic Tool. Connect the ground lead from the DVOM / Oscilloscope to connection port 3  on the Powernet / CUSW CAN Bus Diagnostic Tool.
3. With the ignition ON, use a DVOM / Oscilloscope to measure and record the voltage  on the CAN Bus (-) circuit at connection port 2  of the Powernet / CUSW CAN Bus Diagnostic Tool. Connect the ground lead from the DVOM / Oscilloscope to connection port 3  on the Powernet / CUSW CAN Bus Diagnostic Tool.
4. With the battery and auxiliary battery (if equipped with Engine Stop/Start) disconnected, use a DVOM/Oscilloscope to measure and record the resistance  on the CAN Bus (+) and (-) circuits at the Powernet / CUSW CAN Bus Diagnostic Tool ports 1  and 2  .
5. Compare the recorded CAN Bus voltage measurements with the above CAN Bus Voltages (Normal Operation) table. For additional information, refer to the appropriate CAN Bus circuit failure below:

• 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, along with the direction of where the CAN Bus circuit is open.
• CAN Bus (+) or (-) Circuit Short To Ground:  The measurements with the incorrect voltage and the least amount of resistance indicates which CAN Bus circuit is shorted to ground, along with the direction of where the CAN Bus circuit is shorted.
• CAN Bus (+) or (-) Circuit Short To Voltage:  The measurements with the incorrect voltage indicates which CAN Bus circuit is shorted to voltage, along with the direction of where the CAN Bus circuit is shorted.
• CAN Bus (+) or (-) Circuits Shorted Together:  The measurements with equal voltage and the least amount of resistance indicates the direction of where the CAN Bus circuits are shorted together.

A NORMAL CAN Bus OSCILLOSCOPE WAVEFORM 

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