CAN COMMUNICATION SYSTEM ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

  • "Engine" and "ECT" are not displayed on the "Communication Bus Check" screen of the intelligent tester

  • Applies to "ECM Communication Stop Mode" in the "DTC COMBINATION TABLE"

  • Power source circuit of the ECM

  • ECM

Tech Tips

"Engine" and "ECT" refer to the circuit that includes the ECM.

WIRING DIAGRAM

A01616ZE01
A0160WBE01

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistance of CAN bus main wires and CAN bus branch wires.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine 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.

Tech Tips

Operating the engine switch, any switches, or any doors triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.

PROCEDURE


  1. CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit Click here.

      OK
      The ECM power source circuit is normal.

      Tech Tips

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


    NG

    REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT

    OK

    REPLACE ECM Click here