Diagnosis Item 6: Diagnose when the M.U.T.-III cannot receive the data sent by 4WD-ECU


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 (CAN2) or 4WD-ECU connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the 4WD-ECU and the joint connector (CAN2), power supply circuit to the 4WD-ECU]
  • Malfunction of the 4WD-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-04 joint connector (CAN2) and C-130 4WD-ECU connector
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 C-130 4WD-ECU connector and C-04 joint connector (CAN2)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
(1)Disconnect 4WD-ECU connector and joint connector (CAN2), and check the following wiring harness.
(2)Check that there is continuity between C-130 4WD-ECU connector terminal No.5 and C-04 joint connector (CAN2) terminal No.5 <CAN_H>
OK: Continuity exists (2 Ω or less)
(3)Check that there is continuity between C-130 4WD-ECU connector terminal No.13 and C-04 joint connector (CAN2) terminal No.16 <CAN_L>
OK: Continuity exists (2 Ω or less)
note Check C-35 intermediate connector, and repair if necessary.

Q. Is the check result normal?
Check the power supply circuit of the 4WD-ECU. Refer to Group 27C - Troubleshooting .
Repair the wiring harness.