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Trouble Diagnosis: Self-Diagnosis

If communication signals cannot be transmitted or received among control units communicating via CAN communication line, CAN communication-related DTC is displayed on the CONSULT "Self Diagnostic Result" screen.

NOTE: The following table shows examples of CAN communication-related DTC. For other DTC, refer to the applicable service information.
DTC Self-diagnosis item (CONSULT indication) DTC detection condition Inspection/Action
U1000 CAN COMM CIRCUIT ECM When ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) for 2 seconds or more. Start the inspection. Refer to the applicable article for the indicated control unit.
Except for ECM When a control unit (except for ECM) is not transmitting or receiving CAN communication signal for 2 seconds or more.
U1001 CAN COMM CIRCUIT When ECM is not transmitting or receiving CAN communication signal other than OBD (emission-related diagnosis) for 2 seconds or more.
U1002 SYSTEM COMM When a control unit is not transmitting or receiving CAN communication signal for 2 seconds or less.
U1010 CONTROL UNIT (CAN) When an error is detected during the initial diagnosis for CAN controller of each control unit. Replace the control unit indicating "U1010".
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