54C-CAN BUS DIAGNOSTICS CHART

CAN BUS DIAGNOSTICS TABLE

caution

During diagnosis, a DTC 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 DTC(s). If DTC(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. Also, see the CAN Bus Diagnostic Procedure for how to diagnose CAN bus lines

note

The "X" in the CAN bus diagnostics table indicates the system with diagnostic results of "NC" or "communication error."
Start the CAN bus diagnostics table check with CAN-C.
Since the BSW-ECU (master) stores the CAN bus line abnormality (DTC C2332) from the BSW-ECU (master) to the BSW-ECU (slave), it is excluded from the target of the CAN bus diagnostic of GROUP 54C. If "NC" is displayed only in the "BSW (SUB)" item on the scan tool (M.U.T.-IIISE) screen, read the DTC of the BSW-ECU (master) and perform the corresponding troubleshooting.

CAN-C

ECU	ETACS	Steering Angle Sensor	SRS-AIR BAG	Gateway	EPB	OCM	FCM/LDW/AHB	AWC	ELC-AT/CVT/TC-SST	ABS/ASC/ASTC/WSS	ECPS/4WS	ACC/FCM	MFI	Diagnostic contents and reference pages
All diagnostic reading results	X	X	X	X	X	X	X	X	X	X	X	X	X	Diagnostic Item 1 Communication with no ECUs is possible (CAN-C). Refer to .
														Diagnostic Item 2^* Diagnose shorts in the power supply to CAN-C. Refer to .
														Diagnostic Item 3^* Diagnose shorts in the ground to CAN-C. Refer to .
														Diagnostic Item 4^* Diagnose shorts between CAN_H and L lines (CAN-C). Refer to .
All diagnostic reading results	X	-	-	-	-	-	-	-	-	-	-	-	-	Diagnostic Item 5 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ETACS-ECU. Refer to .
	-	X	-	-	-	-	-	-	-	-	-	-	-	Diagnostic Item 6 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by steering wheel sensor. Refer to .
	-	-	X	-	-	-	-	-	-	-	-	-	-	Diagnostic Item 7 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by SRS-ECU. Refer to .
All diagnostic reading results	-	-	-	X	-	-	-	-	-	-	-	-	-	Diagnostic Item 8 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by gateway-ECU (for BSW). <Vehicles with blind spot warning [BSW] (with Lane Change Assist) system> Refer to .
All diagnostic reading results	-	-	-	-	X	-	-	-	-	-	-	-	-	Diagnostic Item 9 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by electric parking brake ECU. <Vehicles with electric parking brake> Refer to .
All diagnostic reading results	-	-	-	-	-	X	-	-	-	-	-	-	-	Diagnostic Item 10 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by occupant classification-ECU. Refer to .
	-	-	-	-	-	-	X	X	X	X	X	X	X	Diagnostic Item 11 Diagnose the lines between the joint connectors (CAN1 and CAN2). Refer to .
	-	-	-	-	-	-	X	-	-	-	-	-	-	Diagnostic Item 12 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by FCM/LDW/AHB-ECU. Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	X	-	-	-	-	-	Diagnostic Item 13 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by AWC-ECU. <AWD> Refer to .
	-	-	-	-	-	-	-	-	X	X	X	X	X	Diagnostic Item 14 Diagnose the lines between the joint connectors (CAN2 and CAN3). Refer to .
	-	-	-	-	-	-	-	-	X	-	-	-	-	Diagnostic Item 15 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by TCM. Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	X	-	-	-	Diagnostic Item 16 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ASC-ECU. Refer to .
	-	-	-	-	-	-	-	-	-	-	X	-	-	Diagnostic Item 17 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by EPS-ECU. Refer to .
	-	-	-	-	-	-	-	-	-	-	-	X	X	Diagnostic Item 18 Diagnose the lines between the joint connectors (CAN3 and CAN4). Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	-	-	X	-	Diagnostic Item 19 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ACC/FCM-ECU. <Vehicles with ACC> Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	-	-	-	X	Diagnostic Item 20 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ECM. Refer to .

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".

CAN-C-Mid <Up to 19 Model year>

caution

If "NC" or "Communication error" is displayed in the "ETACS" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C table and perform the corresponding troubleshooting.

ECU	F.A.S.T./OSS/IMMO/Keyless	Multi Around Monitor	HUD	Air Conditioning	AUDIO	Meter	TCU	Diagnostic contents and reference pages
All diagnostic reading results	X	X	X	X	X	X	X	Diagnostic Item 21 Communication with no ECUs is possible (CAN-C-Mid). Refer to .
								Diagnostic Item 22^* Diagnose shorts in the power supply to CAN-C-Mid. Refer to .
								Diagnostic Item 23^* Diagnose shorts in the ground to CAN-C-Mid. Refer to .
								Diagnostic Item 24^* Diagnose shorts between CAN_H and L lines (CAN-C-Mid). Refer to .
	X	-	-	-	-	-	-	Diagnostic Item 25 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by KOS&OSS-ECU. <Vehicles with KOS> Refer to .
	-	X	-	-	-	-	-	Diagnostic Item 26 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by Camera-ECU. <Vehicles with multi around monitor>. Refer to .
All diagnostic reading results	-	-	X	-	-	-	-	Diagnostic Item 27 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by HUD. <Vehicles with HUD> Refer to .
	-	-	-	X	-	-	-	Diagnostic Item 28 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by A/C controller assembly. Refer to .
	-	-	-	-	X	-	-	Diagnostic Item 29 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by multivision display. <Vehicles with smartphone link display audio> Refer to .
	-	-	-	-	-	X	-	Diagnostic Item 30 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by combination meter. Refer to .
	-	-	-	-	-	-	X	Diagnostic Item 31 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by telematics control unit (TCU). <Vehicles with TCU (Up to 19 Model year)> Refer to .

note	^*: Diagnostic items 22, 23 and 24 should be checked after the cause of the fault is determined in diagnostic item 21 "Communication with no ECUs is possible (CAN-C-Mid)".

CAN-C-Mid <20 Model year>

caution

If "NC" or "Communication error" is displayed in the "ETACS" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C table and perform the corresponding troubleshooting.

ECU	F.A.S.T./OSS/IMMO/Keyless	Multi Around Monitor	HUD	Air Conditioning	AUDIO	Meter	Gateway3	Diagnostic contents and reference pages
All diagnostic reading results	X	X	X	X	X	X	X	Diagnostic Item 21 Communication with no ECUs is possible (CAN-C-Mid). Refer to .
								Diagnostic Item 22^* Diagnose shorts in the power supply to CAN-C-Mid. Refer to .
								Diagnostic Item 23^* Diagnose shorts in the ground to CAN-C-Mid. Refer to .
								Diagnostic Item 24^* Diagnose shorts between CAN_H and L lines (CAN-C-Mid). Refer to .
	X	-	-	-	-	-	-	Diagnostic Item 25 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by KOS&OSS-ECU. <Vehicles with KOS> Refer to .
	-	X	-	-	-	-	-	Diagnostic Item 26 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by Camera-ECU. <Vehicles with multi around monitor>. Refer to .
All diagnostic reading results	-	-	X	-	-	-	-	Diagnostic Item 27 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by HUD. <Vehicles with HUD> Refer to .
	-	-	-	X	-	-	-	Diagnostic Item 28 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by A/C controller assembly. Refer to .
	-	-	-	-	X	-	-	Diagnostic Item 29 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by multivision display. <Vehicles with smartphone link display audio> Refer to .
	-	-	-	-	-	X	-	Diagnostic Item 30 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by combination meter. Refer to .
	-	-	-	-	-	-	X	Diagnostic Item 33 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by gateway-ECU (for TCU). <Vehicles with TCU (20 Model year)> Refer to .

note	^*: Diagnostic items 22, 23 and 24 should be checked after the cause of the fault is determined in diagnostic item 21 "Communication with no ECUs is possible (CAN-C-Mid)".

GW-CAN-C

caution

If "NC" or "Communication error" is displayed in the "Gateway" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C table and perform the corresponding troubleshooting.
"BSW(SUB)" is excluded from the target of the CAN bus diagnosis of GROUP 54C. If "NC" is displayed only in the "BSW (SUB)" item on the scan tool (M.U.T.-IIISE) screen, read the DTC of the BSW-ECU (master) and perform the corresponding troubleshooting.

ECU	BSW	Diagnostic contents and reference pages
All diagnostic reading results	X	Diagnostic Item 32 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by BSW-ECU (master). <Vehicles with blind spot warning [BSW] (with Lane Change Assist) system> Refer to .

GW-CAN-C-Mid <20 Model year>

caution

If "NC" or "Communication error" is displayed in the "Gateway3" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C table and perform the corresponding troubleshooting.

ECU	TCU	Diagnostic contents and reference pages
All diagnostic reading results	X	Diagnostic Item 34 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by telematics control unit (TCU). <Vehicles with TCU> Refer to .

caution

During diagnosis, a DTC associated with another system may be set when the ignition switch is turned to "ON" position with connector(s) disconnected. After completing the repair, confirm all systems for DTC(s). If DTC(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 diagnosis procedure below only when the CAN bus line is defective. Also, see the CAN Bus Diagnosis Procedure for how to diagnose CAN bus lines

note

The "X" in the CAN bus diagnostics table indicates the system with diagnostic results of "NC" or "communication error."
Start the CAN bus diagnostics table check with CAN-C.
Since the BSW-ECU (master) stores the CAN bus line abnormality (DTC C2332) from the BSW-ECU (master) to the BSW-ECU (slave), it is excluded from the target of the CAN bus diagnosis of GROUP 54C. If "NC" is displayed only in the "BSW (SUB)" item on the scan tool (M.U.T.-IIISE) screen, read the DTC of the BSW-ECU (master) and perform the corresponding troubleshooting.

CAN-C (Diag)

ECU	Multi Channel Gateway	Diagnostic contents and reference pages
All diagnostic reading results	X	Diagnostic Item 1 Communication with gateway-ECU is not possible [CAN-C (Diag)]. Refer to .

CAN-C (Main 1ch)

ECU	ETACS	Steering Angle Sensor	SRS-AIR BAG	EPB	OCM	FCM/LDW/AHB	AWC	ELC-AT/CVT/TC-SST	ABS/ASC/ASTC/WSS	ECPS/4WS	ACC/FCM	MFI	Diagnostic contents and reference pages
All diagnostic reading results	X	X	X	X	X	X	X	X	X	X	X	X	Diagnostic Item 2 Communication with no ECUs is possible [CAN-C (Main)]. Refer to .
													Diagnostic Item 3^* Diagnose shorts in the power supply to [CAN-C (Main)]. Refer to .
													Diagnostic Item 4^* Diagnose shorts in the ground to [CAN-C (Main)]. Refer to .
													Diagnostic Item 5^* Diagnose shorts between CAN_H and L lines [CAN-C (Main)]. Refer to .
All diagnostic reading results	X	-	-	-	-	-	-	-	-	-	-	-	Diagnostic Item 6 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ETACS-ECU. Refer to .
All diagnostic reading results	-	X	-	-	-	-	-	-	-	-	-	-	Diagnostic Item 7 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by steering wheel sensor. Refer to .
All diagnostic reading results	-	-	X	-	-	-	-	-	-	-	-	-	Diagnostic Item 8 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by SRS-ECU. Refer to .
All diagnostic reading results	-	-	-	X	-	-	-	-	-	-	-	-	Diagnostic Item 9 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by electric parking brake ECU. <Vehicles with electric parking brake> Refer to .
All diagnostic reading results	-	-	-	-	X	-	-	-	-	-	-	-	Diagnostic Item 10 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by occupant classification-ECU Refer to .
All diagnostic reading results	-	-	-	-	-	X	X	X	X	X	X	X	Diagnostic Item 11 Diagnose the lines between the joint connectors (CAN1 and CAN2). Refer to .
	-	-	-	-	-	X	-	-	-	-	-	-	Diagnostic Item 12 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by FCM/LDW/AHB-ECU <Vehicles with FCM>. Refer to .
	-	-	-	-	-	-	X	-	-	-	-	-	Diagnostic Item 13 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by AWC-ECU. <AWD> Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	X	X	X	X	X	Diagnostic Item 14 Diagnose the lines between the joint connectors (CAN2 and CAN3). Refer to .
	-	-	-	-	-	-	-	X	-	-	-	-	Diagnostic Item 15 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by TCM. Refer to .
	-	-	-	-	-	-	-	-	X	-	-	-	Diagnostic Item 16 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ASC-ECU. Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	X	-	-	Diagnostic Item 17 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by EPS-ECU. Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	-	X	X	Diagnostic Item 18 Diagnose the lines between the joint connectors (CAN3 and CAN4). Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	-	X	-	Diagnostic Item 19 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ACC/FCM-ECU. <Vehicles with ACC> Refer to .
All diagnostic reading results	-	-	-	-	-	-	-	-	-	-	-	X	Diagnostic Item 20 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by ECM. Refer to .

note	^*: Diagnostic items 3, 4 and 5 should be checked after the cause of the fault is determined in diagnostic item 2 "Communication with no ECUs is possible [CAN-C (Main)]".

CAN-C-Mid (Sub 2ch)

caution

If "NC" or "Communication error" is displayed in the "ETACS" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C (Main 1ch) table and perform the corresponding troubleshooting.

ECU	F.A.S.T./OSS/IMMO/Keyless	Multi Around Monitor	HUD	Air Conditioner	AUDIO	Meter	Diagnostic contents and reference pages
All diagnostic reading results	X	X	X	X	X	X	Diagnostic Item 21 Communication with no ECUs is possible [CAN-C-Mid (Sub)]. Refer to .
							Diagnostic Item 22^* Diagnose shorts in the power supply to CAN-C-Mid (Sub). Refer to .
							Diagnostic Item 23^* Diagnose shorts in the ground to CAN-C-Mid (Sub). Refer to .
							Diagnostic Item 24^* Diagnose shorts between CAN_H and L lines [CAN-C-Mid (Sub)]. Refer to .
	X	-	-	-	-	-	Diagnostic Item 25 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by KOS&OSS-ECU. <Vehicles with KOS> Refer to .
	-	X	-	-	-	-	Diagnostic Item 26 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by Camera-ECU. <Vehicles with multi around monitor> Refer to .
All diagnostic reading results	-	-	X	-	-	-	Diagnostic Item 27 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by HUD. <Vehicles with HUD> Refer to .
	-	-	-	X	-	-	Diagnostic Item 28 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by A/C controller assembly. Refer to .
	-	-	-	-	X	-	Diagnostic Item 29 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by multivision display <Vehicles with smartphone link display audio>. Refer to .
	-	-	-	-	-	X	Diagnostic Item 30 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by combination meter. Refer to .

note	^*: Diagnostic items 22, 23 and 24 should be checked after the cause of the fault is determined in diagnostic item 21 "Communication with no ECUs is possible [CAN-C-Mid (Sub)]".

CAN-C (BSW 3ch)

caution

If "NC" or "Communication error" is displayed in the "Multi channel gateway" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C (Main 1ch) table and perform the corresponding troubleshooting.
"BSW(SUB)" is excluded from the target of the CAN bus diagnosis of GROUP 54C. If "NC" is displayed only in the "BSW (SUB)" item on the scan tool (M.U.T.-IIISE) screen, read the DTC of the BSW-ECU (master) and perform the corresponding troubleshooting.

ECU	BSW	Diagnostic contents and reference pages
All diagnostic reading results	X	Diagnostic Item 31 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by BSW-ECU (master). <Vehicles with blind spot warning [BSW] (with Lane Change Assist) system> Refer to .

CAN-C-Mid (TCU 4ch)

caution

If "NC" or "Communication error" is displayed for multiple ECUs connected to the CAN-C-Mid bus line, refer to CAN-C-Mid (Sub 2ch) table and perform the corresponding troubleshooting.
If "NC" or "Communication error" is displayed in the "ETACS" item on the scan tool (M.U.T.-IIISE) screen, refer to CAN-C-Mid table and perform the corresponding troubleshooting.

ECU	TCU	Diagnostic contents and reference pages
All diagnostic reading results	X	Diagnostic Item 32 Diagnose when the scan tool (M.U.T.-IIISE) cannot receive the data sent by telematics control unit (TCU). <Vehicles with telematics control unit (TCU)> Refer to .