Diagnosis Item 14: Diagnose when the M.U.T.-III cannot receive the data sent by WCM


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 (CAN1) or WCM connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the WCM connector and the joint connector (CAN1), or power supply circuit to the WCM]
  • Malfunction of the WCM

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-105 joint connector (CAN1) and C-33 WCM 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-33 WCM connector and C-105 joint connector (CAN1)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
(1)Disconnect WCM connector and joint connector (CAN1), and check the following wiring harness.
(2)Check that there is continuity between C-33 WCM connector terminal No.11 and C-105 joint connector (CAN1) terminal No.5 <CAN_H>
OK: Continuity exists (2 Ω or less)
(3)Check that there is continuity between C-33 WCM connector terminal No.10 and C-105 joint connector (CAN1) terminal No.16 <CAN_L>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Check the power supply circuit of the WCM. Refer to Group 42C - WCM - Troubleshooting .
Repair the wiring harness.