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Inspection Procedure 1: Scan tool (M.U.T.-III) cannot Communicate with the Electronically Controller AWD System.
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
If scan tool (M.U.T.-III) cannot communicate with the electronically controlled AWD system, the CAN bus lines may have a problem. If the electronically controller AWD system is not in operation (in case of no AWD operation), the AWD-ECU power supply circuit system or AWD-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • AWD-ECU malfunction
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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 AWD-ECU connector
(1) Disconnect the AWD-ECU connector.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the AWD-ECU wiring harness side connector terminals 4WDF, IG16 (Ignition switch "ON") and the body ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
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 AWD-ECU connector
(1) Disconnect the AWD-ECU connector.
(2) Measure the resistance between the AWD-ECU wiring harness side connector terminals No. GND1 and the body ground.
OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 4.
Repair the connector(s) or terminal(s) or wiring harness.
 
STEP 4. Retest the system.
Does the malfunction occur again?
Replace AWD-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.
Does the malfunction occur again?
Diagnose again from Step 1.
This diagnosis is complete.