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

If the M.U.T.-III can not communicate with the 4WD-ECU, this diagnosis result will be set.

TRUBLE JUDGEMENT CONDITIONS

If a communication flag is not set for the 4WD-ECU, the ETACS-ECU determines that there is a failure.

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

Disconnect 4WD-ECU connector and joint connector (CAN2), and check the following wiring harness.

The wiring harness between C-130 4WD-ECU connector terminal No.5 and C-04 joint connector (CAN2) terminal No.5 <CAN_H>
The wiring harness between C-130 4WD-ECU connector terminal No.13 and C-04 joint connector (CAN2) terminal No.16 <CAN_L>

note

Check C-37 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.