Diagnosis Item 8: 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 JUDGEMENT CONDITIONS



TROUBLESHOOTING HINTS



  • Malfunction of the connector [joint connector (CAN3) or ABS-ECU connector <vehicles without ASC> or ASC-ECU connector <vehicles with ASC> 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-04 ABS-ECU connector <vehicles without ASC> or A-58 ASC-ECU connector <vehicles with ASC> and C-124 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-04 ABS-ECU connector <vehicles without ACS> or A-58 ASC-ECU connector <vehicles with ASC> and C-124 joint connector (CAN3)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
Disconnect ABS-ECU connector <vehicles without ASC> or ASC-ECU connector <vehicles with ASC> and joint connector (CAN3), and check the following wiring harness for open circuit.
(1)The wiring harness between A-04 ABS-ECU connector terminal No.4 <vehicles without ASC> or A-05 ASC-ECU connector terminal No.12 <vehicles with ASC> and C-124 joint connector (CAN3) terminal No.6 <CAN_H>
OK: Continuity exists (2 Ω or less)
(2)The wiring harness between A-04 ABS-ECU connector terminal No.6 <vehicles without ASC> or A-05 ASC-ECU connector terminal No.13 <vehicles with ASC> and C-127 joint connector (CAN3) terminal No.19 <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 without ASC>. Refer to GROUP 35C - Troubleshooting <vehicles without ASC> or Refer to GROUP 35C - Troubleshooting <vehicles with ASC>.
Repair the wiring harness.