CAN BUS DIAGNOSTICS TABLE

caution

During diagnosis, a diagnosis 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 diagnosis code(s). If diagnosis 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 diagnosis procedure below only when the CAN bus line is defective.

M.U.T.-III screen		Diagnosis detail	Reference page
(The ECUs that are not adopted are not displayed.)	Comment	Diagnosis detail	Reference page
	Failure in red displayed area is estimated.	Diagnosis Item 1 Communication with no ECUs is possible.
-	-	Diagnosis Item 2^* Diagnose shorts in the power supply to CAN bus line.
-	-	Diagnosis Item 3^* Diagnose shorts in the earth to CAN bus line.
-	-	Diagnosis Item 4^* Diagnose shorts between CAN_H and L lines.
	Disconnection in red displayed area is estimated.	Diagnosis Item 5 Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 6 Diagnose when the M.U.T.-III cannot receive the data sent by combination meter.
	Disconnection in red displayed area is estimated.	Diagnosis Item 7 Diagnose when the M.U.T.-III cannot receive the data sent by SRS-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 8 Diagnose when the M.U.T.-III cannot receive the data sent by KOS&OSS-ECU. <Vehicles with KOS>
	Disconnection in red displayed area is estimated.	Diagnosis Item 9 Diagnose when the M.U.T.-III cannot receive the data sent by A/C-ECU. <Vehicles with automatic A/C>
	Disconnection in red displayed area is estimated.	Diagnosis Item 10 Diagnose when the M.U.T.-III cannot receive the data sent by FCM-ECU. <Vehicles with FCM-LS>
	Disconnection in red displayed area is estimated.	Diagnosis Item 11 Diagnose when the M.U.T.-III cannot receive the data sent by steering wheel sensor. <Vehicles with ASC>
	Disconnection in red displayed area is estimated.	Diagnosis Item 12 Diagnose the lines between the joint connectors. (CAN1 and CAN2)
	Disconnection in red displayed area is estimated.	Diagnosis Item 13 Diagnose when the M.U.T.-III cannot receive the data sent by EPS-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 14 Diagnose when the M.U.T.-III cannot receive the data sent by ABS-ECU <Vehicles without ASC> or ASC-ECU <Vehicles with ASC>.
	Disconnection in red displayed area is estimated.	Diagnosis Item 15 Diagnose when the M.U.T.-III cannot receive the data sent by CVT-ECU. <CVT>
	Disconnection in red displayed area is estimated.	Diagnosis Item 16 Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU.

note

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