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 Comment	Reference page	Reference page
(The ECUs that are not adopted are not displayed.)	Diagnosis detail Comment	Reference page	Reference page
	Failure in red displayed area is estimated.	Diagnosis Item 1 Communication with no ECUs is possible (MAIN).
-	-	Diagnosis Item 2^*1 Diagnose shorts in the power supply to CAN bus line (MAIN).
-	-	Diagnosis Item 3^*1 Diagnose shorts in the earth to CAN bus line (MAIN).
-	-	Diagnosis Item 4^*1 Diagnose shorts between CAN_H and L lines (MAIN).
	Failure in red displayed area is estimated.	Diagnosis Item 5 Communication with no ECUs is possible (SUB). <Vehicles with automatic A/C>
-	-	Diagnosis Item 6^*2 Diagnose shorts in the power supply to CAN bus line (SUB). <Vehicles with automatic A/C>
-	-	Diagnosis Item 7^*2 Diagnose shorts in the earth to CAN bus line (SUB). <Vehicles with automatic A/C>
-	-	Diagnosis Item 8^*2 Diagnose shorts between CAN_H and L lines (SUB). <Vehicles with automatic A/C>
	Disconnection in red displayed area is estimated.	Diagnosis Item 9 Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 10 Diagnose when the M.U.T.-III cannot receive the data sent by gateway ECU. <Vehicles with automatic A/C>
	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 ASTC>
	Disconnection in red displayed area is estimated.	Diagnosis Item 12 Diagnose when the M.U.T.-III cannot receive the data sent by transfer-ECU. <Vehicles with 4WD>
	Disconnection in red displayed area is estimated.	Diagnosis Item 13 Diagnose when the M.U.T.-III cannot receive the data sent by combination meter.
	Disconnection in red displayed area is estimated.	Diagnosis Item 14 Diagnose when the M.U.T.-III cannot receive the data sent by KOS&OSS-ECU. <Vehicles with keyless operation system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 15 Diagnose when the M.U.T.-III cannot receive the data sent by SRS-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 16 Diagnose when the M.U.T.-III cannot receive the data sent by clearance warning control unit. <Vehicles with ultrasonic misacceleration mitigation, blind spot warning or corner sensor system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 17 Diagnose when the M.U.T.-III cannot receive the data sent by A/T-ECU. <Vehicles with A/T>
	Disconnection in red displayed area is estimated.	Diagnosis Item 18 Diagnose when the M.U.T.-III cannot receive the data sent by electric parking brake-ECU. <Vehicles with electric parking brake system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 19 Diagnose when the M.U.T.-III cannot receive the data sent by ABS-ECU <Vehicles without ASTC> or ASTC-ECU. <Vehicles with ASTC>
	Disconnection in red displayed area is estimated.	Diagnosis Item 20 Diagnose when the M.U.T.-III cannot receive the data sent by FCM-ECU. <Vehicles with forward collision mitigation system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 21 Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU.
	Disconnection in red displayed area is estimated.	Diagnosis Item 22 Diagnose when the M.U.T.-III cannot receive the data sent by headlamp levelling-ECU. <Vehicles with auto headlamp levelling system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 23 Diagnose when the M.U.T.-III cannot receive the data sent by camera-ECU. <Vehicles with multi around monitor system>
	Disconnection in red displayed area is estimated.	Diagnosis Item 24 Diagnose when the M.U.T.-III cannot receive the data sent by A/C-ECU. <Vehicles with automatic A/C>

note

^*1: 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".
^*2: diagnosis items 6, 7 and 8 should be checked AFTER the cause of the fault is determined in diagnosis item 5 "Communication with no ECUs is possible".