Inspection Procedure 1: M.U.T.-III cannot Communicate with the Electronically Controller 4WD System.

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSES

Damaged wiring harness and connectors
4WD-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

	Go to Step 2.

	Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting/CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Voltage measurement at the 4WD-ECU connector

(1)Disconnect the 4WD-ECU connector.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between the 4WD-ECU wiring harness side connector terminals BATT, IG1 (Ignition switch "ON") and the body earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 3.

	Repair the connector(s) or terminal(s) or wiring harness.

STEP 3. Resistance measurement at the 4WD-ECU connector

(1)Disconnect the 4WD-ECU connector.

(2)Measure the resistance between the 4WD-ECU wiring harness side connector terminals No. GND1 and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or terminal(s) or wiring harness.

STEP 4. Retest the system.

Q. Does the malfunction occur again?

	Replace 4WD-ECU (Refer to ). Then go to Step 5 .

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).

STEP 5. Retest the system.

Q. Does the malfunction occur again?

	Diagnose again from Step 1.

	This diagnosis is complete.