Diagnosis Item 10: Diagnose when the M.U.T.-III cannot receive the data sent by electric power steering-ECU <1500>


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 electric power steering-ECU connector improperly connected]
  • Malfunction of the wiring harness [open circuit between the electric power steering-ECU and the joint connector (CAN3), power supply circuit to the electric power steering-ECU]
  • Malfunction of the electric power steering-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-114 electric power steering-ECU connector 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 C-114 electric power steering-ECU connector and C-124 joint connector (CAN3)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
Disconnect electric power steering-ECU connector and joint connector (CAN3), and check the following wiring harness for open circuit.
(1)The wiring harness between C-114 electric power steering-ECU connector terminal No.4 and C-124 joint connector (CAN3) terminal No.3 <CAN_H>
OK: Continuity exists (2 Ω or less)
(2)The wiring harness between C-114 electric power steering-ECU connector terminal No.3 and C-124 joint connector (CAN3) terminal No.14 <CAN_L>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Check the power supply circuit of the electric power steering-ECU. Refer to GROUP 54A - Headlamp - Troubleshooting .
Repair the wiring harness.