CAN COMMUNICATION SYSTEM Combination Meter ECU Communication Stop Mode

DTC Code DTC Name
Combination Meter ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Combination Meter ECU Communication Stop Mode

Either condition is met:

  • "Combination Meter" is not displayed on the CAN Bus Check screen of the GTS

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  • Communication system DTCs (DTCs that start with U) that correspond to "Combination Meter ECU Communication Stop Mode" in "DTC Combination Table" are output

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  • Combination meter assembly main line or connector

  • Power source circuit of combination meter assembly

  • Combination meter assembly ground circuit

  • Combination meter assembly

WIRING DIAGRAM

C275978E01
C244007E06

CAUTION / NOTICE / HINT

Note:

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds, and then drive the vehicle at a speed of 20 km/h (12 mph) or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tip:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

  1. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY MAIN LINE)

    1. Disconnect the cable from the negative (-) battery terminal.

    2. C263368C22

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the E46 combination meter assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E46-32 (CANH) - E46-31 (CANL)

      Cable disconnected from negative (-) battery terminal

      108 to 132 Ω

    Result

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (COMBINATION METER ASSEMBLY MAIN LINE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    1. C263368C24

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E46-21 (ET) - Body ground

      Cable disconnected from negative (-) battery terminal

      Below 1 Ω
    2. C263368C25

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Connect the cable to the negative (-) battery terminal.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E46-40 (B) - Body ground

      Always

      11 to 14 V

      E46-39 (IG+) - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Result

    Result

    OK

    NG
    OK

    REPLACE COMBINATION METER ASSEMBLY

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    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)