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LAN-22 < BASIC INSPECTION > [CAN FUNDAMENTAL] DIAGNOSIS AND REPAIR WORKFLOW Identify the error circuit using information from the “CAN DIAG SUPPORT MNTR” NOTE: CAN communication line has no error if units other than Diag on CAN units are not indicated. An error may be on the power supply of the control unit, DDL1 line or DDL2 line. a. “TCM” which is Diag on CAN unit, is not indicated on “ALL DTC.” This indicates that DLC is not receiving a signal from TCM. Draw a line to indicate an error between DLC and TCM (line 1-a in the figure below). NOTE: • Diag on CAN units are not indicated on the “ALL DTC” when the CAN line between Diag on CAN unit and the data link connector is open. • For a description of Diag on CAN, refer to 2. CAN DIAG SUPPORT MNTR: Check each item on “CAN DIAG SUPPORT MNTR”. Draw a line on the diagnosis sheet to indicate the error circuit. a. Reception item of “ENGINE”: On “TCM”, “UNKWN” is indicated. This means ECM cannot receive the sig- nal from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure below). NOTE: If “UNKWN” is indicated on “TRANSMIT DIAG”, then the control unit cannot transmit CAN communication signal to each unit. Draw a line between the control unit and the splice. b. Reception item of “ADAPTIVE LIGHT”: On “TCM”, “UNKWN” is indicated. This means AFS cannot receive the signal from TCM. Draw a line to indicate an error between AFS and TCM (line 2-b in the figure below). JSMIA0813GB |