Diagnosis Item 9: Diagnose when the M.U.T.-III cannot receive the data sent by ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC>


caution When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.












FUNCTION



TROUBLE JUDGMENT CONDITIONS



TROUBLESHOOTING HINTS



  • Malfunction of the connector [joint connector (CAN3) or ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC> connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC> and the joint connector (CAN3), power supply circuit to the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC>]
  • Malfunction of the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-02 ABS-ECU connector <vehicles without ASC> or A-03 ASC-ECU connector <vehicles with ASC> and C-01 joint connector (CAN3)
caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the wiring harness between A-02 ABS-ECU connector <vehicles without ASC> or A-03 ASC-ECU connector <vehicles with ASC> and C-01 joint connector (CAN3)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
(1)Disconnect ABS-ECU connector <vehicles without ASC> or ASC-ECU connector <vehicles with ASC> and joint connector (CAN3), and check the following wiring harness.
(2)Check that there is continuity between A-02 ABS-ECU connector terminal No.4 and C-01 joint connector (CAN3) terminal No.6 <vehicles without ASC - CAN_H>
OK: Continuity exists (2 Ω or less)
(3)Check that there is continuity between A-03 ASC-ECU connector terminal No.11 and C-01 joint connector (CAN3) terminal No.6 <vehicles with ASC - CAN_H>
OK: Continuity exists (2 Ω or less)
(4)Check that there is continuity between A-02 ABS-ECU connector terminal No.6 and C-01 joint connector (CAN3) terminal No.19 <vehicles without ASC - CAN_L>
OK: Continuity exists (2 Ω or less)
(5)Check that there is continuity between A-03 ASC-ECU connector terminal No.15 and C-01 joint connector (CAN3) terminal No.19 <vehicles with ASC - CAN_L>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Check the power supply circuit of the ABS-ECU <vehicles without ASC> or ASC-ECU <vehicles with ASC>. Refer to Group 35B - Troubleshooting <vehicles without ASC> or Group 35C - Troubleshooting <vehicles with ASC>.
Repair the wiring harness.