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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Communication - Non-DTC Based Diagnostics >> Diagnosis And Testing >> Checking Automotive ETHERNET Using MOPAR Scope >> Diagnostic Test

Diagnostic Test

  1. DETERMINE THE AUTOMOTIVE ETHERNET NETWORK TO BE DIAGNOSED 
    1. Using, determine the Automotive Ethernet network Master and the appropriate diagnostic information, Slave ECUs with the communication concern before proceeding.
    2. Correct and repair ALL  power related DTCs that are associated to the Master and Slave ECUs before proceeding with any Automotive Ethernet diagnosis
    3. Correct and repair ALL  Controller Area Network (CAN) bus communication concerns before proceeding with any Automotive Ethernet diagnosis.
      NOTE:

      This test assumes there are no lost communication concerns over the Controller Area Networks (CANs) the two Automotive Ethernet ECUs are connected to. The scan tool vehicle topology view only shows CAN bus communication status.

      • Go To  2
  2. TESTING ETHERNET BUS USING THE MOPAR SCOPE 
    1. Using the Mopar Scope, Automotive Ethernet Systems table and wiring diagrams, determine the Automotive Ethernet network circuit integrity between the Master and Slave ECUs.
      NOTE:

      Some vehicles can have multiple Automotive Ethernet connections within a connector, make sure that you are testing the same Automotive Ethernet for both circuits.

    2. Connect the black pin for each test lead to Chassis ground. Connect the blue lead to ETHERNET (+) and the red lead to ETHERNET (-) for the circuits to be tested.
      GC0199031Courtesy of CHRYSLER GROUP, LLC
    3. Start the Mopar Scope.
    4. Turn the ignition on.
      NOTE:

      When connected to the vehicle harness correctly, the LEDs on the breakout box will light up to indicate that there is activity on the bus.

    5. A waveform should appear.
      DESCRIPTION MEASUREMENT
      CHANNEL A 5 volts
      CHANNEL B 5 volts
      TIME BASE 50 μs/div [microseconds / division control]
      ZOOM / VIEW X1 - VERTICAL
      X64 - HORIZONTAL
      NOTE:

      The image below is of a normal ETHERNET bus waveform using the Mopar Scope. The waveform will show voltage peaks greater than 1.0 volt.

      GC0201377Courtesy of CHRYSLER GROUP, LLC
    6. Compare the known good ethernet waveform from above to the bad ethernet waveforms pictured below:
      • Ethernet (+) and (-) Circuit Open - Missing Slave ECU 
        NOTE:

        The waveform will show voltage peaks less than 1.0 volt.

        GC0201381Courtesy of CHRYSLER GROUP, LLC
        GC0200689Courtesy of CHRYSLER GROUP, LLC
        NOTE:

        Closer comparison between good and bad ethernet waveforms - The voltage peaks on the Bad waveform do NOT reach 1 volt, yet the voltage peaks on the Good waveform will be greater than 1 volt.

      • GC0201728Courtesy of CHRYSLER GROUP, LLC

      Did the Mopar Scope show a good ethernet waveform?

      • The condition that originally caused the concern may not be present at this time.
      • Continue to use the Mopar Scope and wiring diagrams as a guide to trace the circuits and look for any in-line connectors where the fault could occur intermittently by wiggling the wire harness and connectors.
      • Look for any chafed, pierced, pinched, or partially broken wires.
      • Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related wire harness connectors.
      • Perform any Technical Service Bulletins (TSBs) that may apply.
      • Go To  3
  3. ISOLATE AND CHECK THE FAULTY ETHERNET CIRCUIT(S) FOUND FROM THE BAD WAVEFORM 
    1. Turn the ignition off.
    2. Disconnect the related wire harness connectors of the two ECUs that contain the circuit(s) suspected.
    3. Using a DVOM/DMM, continue to check the integrity of the faulty circuit(s) found from the bad waveform for the Automotive Ethernet system from the Master to the Slave Ethernet ECUs for the following:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.
      • Circuit Open / High Resistance - less than 1 ohm 
      • Circuit Short To Battery - No voltage  .
      • Circuit Short To Ground - No continuity  .
      • Circuit Short Together - No continuity  .

      Ethernet wiring repairs are NOT  recommended due to the sensitivity of the circuit usage involved. From the above checks, repair / replace  any conditions found as needed.

    4. Reconnect all Automotive Ethernet system harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    5. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. With the scan tool, select the Guided Diagnostic tab and reset the Master and Slave Ethernet ECUs identified in Step 1 of this diagnostic.
    8. After the ECU reset procedure is completed for both the Master and Slave Ethernet ECUs with the scan tool, erase all DTCs that may have set.
    9. Turn the ignition off for a minimum of 10.0 seconds.
    10. Turn the ignition on.
    11. Check the status of the Automotive Ethernet system with the Mopar Scope.

      Did the bad waveform return?

      Yes 

      • Go To  4

      No 

      • The concern has been repaired.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
      • Test complete.
  4. REPLACE THE SLAVE ETHERNET ECU AND RECHECK 
    1. Using the Automotive Ethernet Systems table replace the Slave Ethernet ECU  , in accordance with its Service Information.
    2. With the scan tool, select the Guided Diagnostic tab and reset the Master and Slave Ethernet ECUs identified in Step 1 of this diagnostic, with this active DTC.
      NOTE:

      For this DTC to appear ACTIVE, the Automotive Ethernet ECU must be communicating on a CAN identified by a YELLOW Icon  .

    3. After the ECU reset procedure is completed for both the Master and Slave Ethernet ECUs with the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Replace the Master Automotive Ethernet ECU in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

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