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CAN COMMUNICATION SYSTEM ECM Communication Stop Mode

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DTC Code DTC Name
  ECM Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

  • "Engine" is not displayed on "Communication Bus Check" screen of the intelligent tester.

  • Applies to ECM Communication Stop Mode in DTC Combination Table.

  • Power source circuit of ECM

  • ECM main wire or connector

  • ECM
A01NN4KE02
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tip:

  • Operating the power 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.

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PROCEDURE


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    CHECK CAN BUS WIRE FOR DISCONNECTION (ECM MAIN WIRE)


    1. Turn the power switch off.

    2. A01NM3YE07

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A76-12 (CANH) - A76-25 (CANL) Power switch off 108 to 132 Ω
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

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    CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit.

      w/ EGR system:Click here

      w/o EGR system:Click here

      Tip:

      If there is no abnormality in the ECM power source circuit, replace the ECM.


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    REPLACE ECMClick here

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    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM MAIN WIRE)

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    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT