CAN BUS DIAGNOSTICS TABLE


caution
  • A diagnosis code may not also be set in the CAN-B lines under the conditions below. If no diagnosis code has been set due to electrical noise, confirm diagnosis item 22 .

    • Open circuit at the CAN_H side of the CAN-B bus lines
    • Open circuit at the CAN_L side of the CAN-B bus line
    • Short to earth at the CAN_H side of the CAN-B bus line
  • 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


Short circuit to battery in red displayed area is estimated.
 Diagnosis Item 1
Diagnose when the M.U.T.-III cannot receive the data sent by ETACS-ECU


Earthing in red displayed area is estimated.
 Diagnosis Item 2
Malfunction of the ETACS-ECU


CAN-C: A bus-off failure is present in the gateway ECU.
 Diagnosis Item 3
Abnormal short between the CAN-C bus lines
CAN-C: Earthing in red displayed area is estimated
 Diagnosis Item 4
Diagnose shorts in the ground to CAN-C bus line
CAN-C: Short circuit to battery in red displayed area is estimated
 Diagnosis Item 5
Diagnose shorts in the power supply to CAN-C bus line


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 6
Diagnose when the M.U.T.-III cannot receive the data sent by 4WD-ECU


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 7
Diagnose when the M.U.T.-III cannot receive the data sent by steering wheel sensor


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 8
Diagnose when the M.U.T.-III cannot receive the data sent by ASC-ECU


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 9
Diagnose when the M.U.T.-III cannot receive the data sent by engine-ECU


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 10
Diagnose the lines between the ETACS-ECU and joint connector (CAN2)


CAN-C: Disconnection in red displayed area is estimated.
 Diagnosis Item 11
Diagnose the lines between joint connector (CAN2) and joint connector (CAN3)


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 12
Diagnose when the M.U.T.-III cannot receive the data sent by WCM
Diagnosis Item 13
Diagnose when the M.U.T.-III cannot receive the data sent by KOS-ECU


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 14
Diagnose when the M.U.T.-III cannot receive the data sent by SRS-ECU


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 15
Diagnose when the M.U.T.-III cannot receive the data sent by A/C-ECU


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 16
Diagnose when the M.U.T.-III cannot receive the data sent by audio unit


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 17
Diagnose when the M.U.T.-III cannot receive the data sent by CAN box unit


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 18
Diagnose when the M.U.T.-III cannot receive the data sent by hands free-ECU


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 19
Diagnose when the M.U.T.-III cannot receive the data sent by combination meter


CAN-B: A failure in the red section, or a bus-off failure is present in the gateway ECU.
 Diagnosis Item 20
Short to power supply or earth in both CAN_H and CAN_L lines.


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 21
Diagnose the ETACS-ECU, joint connector (CAN1) or lines between ETACS-ECU and joint connector (CAN1)


CAN-B: Disconnection in red displayed area is estimated.
 Diagnosis Item 22
Short to power supply or earth, open circuit or line-to-line short in the CAN-B bus lines