Diagnosis Item 7: Diagnose when the M.U.T.-III cannot receive the data sent by AWC-ECU <RALLIART>


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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-03 joint connector (CAN2) and C-44 AWC-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-44 AWC-ECU connector and C-03 joint connector (CAN2)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .
Disconnect AWC-ECU connector and joint connector (CAN2), and check the following wiring harness for open circuit.
(1)The wiring harness between C-44 AWC-ECU connector terminal No.4 and C-03 joint connector (CAN2) terminal No.4 <LHD> or 7 <RHD> <CAN_H>
OK: Continuity exists (2 Ω or less)
(2)The wiring harness between C-44 AWC-ECU connector terminal No.5 and C-03 joint connector (CAN2) terminal No.15 <LHD> or 20 <RHD> <CAN_L>
OK: Continuity exists (2 Ω or less)
note Check C-27 intermediate connector, and repair if necessary.

Q. Is the check result normal?
Check the power supply circuit of the AWC-ECU. Refer to GROUP 22E - Troubleshooting <ACD>.
Repair the wiring harness.