54C-CAN BUS DIAGNOSTICS CHART

CAN BUS DIAGNOSTICS TABLE

caution

During diagnosis, a diagnostic trouble code associated with another system may be set when the ignition switch is turned on with connector(s) disconnected. After completing the repair, confirm all systems for diagnostic trouble code(s). If diagnostic trouble code(s) are set, erase them all.

This diagnosis applies only to the CAN bus lines. If a different system is defective, proceed to the applicable diagnosis section for each system. Observe the diagnostic procedure below only when the CAN bus line is defective.

Scan tool screen		Diagnostics detail	Reference page
The ECUs that are not adopted are not displayed. PTC heater control unit (ECU for signal reception only) is not displayed.	Comment	Diagnostics detail	Reference page
	Failure in red displayed area is estimated.	Diagnostic Item 1 Communication with no ECUs is possible.
-	-	Diagnostic Item 2^* Diagnose shorts in the power supply to CAN bus line
-	-	Diagnostic Item 3^* Diagnose shorts in the ground to CAN bus line
-	-	Diagnostic Item 4^* Diagnose shorts between CAN_H and L lines
	Failure in red displayed area is estimated.	Diagnostic Item 5 Diagnose when the scan tool cannot receive the data sent by ETACS-ECU.
	Failure in red displayed area is estimated.	Diagnostic Item 6 Diagnose when the scan tool cannot receive the data sent by combination meter.
	Failure in red displayed area is estimated.	Diagnostic Item 7 Diagnose when the scan tool cannot receive the data sent by SRS-ECU.
	Failure in red displayed area is estimated.	Diagnostic Item 8 Diagnose when the scan tool cannot receive the data sent by KOS&OSS-ECU. <Vehicles with KOS>
	Failure in red displayed area is estimated.	Diagnostic Item 9 Diagnose when the scan tool cannot receive the data sent by auto A/C controller assembly (A/C-ECU). <Vehicles with automatic A/C>
	Failure in red displayed area is estimated.	Diagnostic Item 10 Diagnose when the scan tool cannot receive the data sent by steering wheel sensor.
	Failure in red displayed area is estimated.	Diagnostic Item 11 Diagnose when the scan tool cannot receive the data sent by occupant classification-ECU.
	Failure in red displayed area is estimated.	Diagnostic Item 12 Diagnose the lines between the joint connectors (CAN1 and CAN2)
	Failure in red displayed area is estimated.	Diagnostic Item 13 Diagnose when the scan tool cannot receive the data sent by EPS-ECU.
	Failure in red displayed area is estimated.	Diagnostic Item 14 Diagnose when the scan tool cannot receive the data sent by ASC-ECU.
	Failure in red displayed area is estimated.	Diagnostic Item 15 Diagnose when the scan tool cannot receive the data sent by transaxle control module (TCM). <CVT>
	Failure in red displayed area is estimated.	Diagnostic Item 16 Diagnose when the scan tool cannot receive the data sent by engine control module (ECM).

note	^*: Diagnostic items 2, 3 and 4 should be checked after the cause of the fault is determined in diagnostic item 1 "Communication with no ECUs is possible".