Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect 4WAS front control unit harness connector.
3. Check the voltage between 4WAS front control unit harness connector terminal and ground.
   VOLTAGE SPECIFICATION
   
   

   4WAS front control unit		Voltage (Approx.)
   Connector	Terminal
   M41	11 - Ground	Battery voltage
   M42	15 - Ground	0 V

4. Turn the ignition switch ON.
   CAUTION: Never start the engine.
5. Check the voltage between 4WAS front control unit harness connector terminal and ground.

Is the inspection result normal? 

YES: GO TO 2.

NO: Check the following items. Repair or replace the malfunctioning parts.

• 40A fusible link (#I) open
  • Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11 terminal and the ground
• Open between the battery and 4WAS front control unit harness connector No. 11 terminal
• 10A fuse (#3) open
  • Short among 10A fuse (#3) connector, 4WAS front control unit harness connector No. 15 terminal and the ground
  • Short among 10A fuse (#3) connector, unified meter and A/C amp harness connector No. 53 terminal and the ground
• Open between the ignition switch and 4WAS front control unit harness connector No. 15 terminal
• Battery or ignition switch

Check the continuity between 4WAS front control unit harness connector terminal and the ground.

Is the inspection result normal? 

YES: GO TO 3.

NO: Repair or replace the harnesses and connectors.

Check 4WAS front control unit harness connector pin terminal and connection for disconnection.

Is the inspection result normal? 

YES: GO TO 4.

NO: Repair or replace the specific malfunctioning part.

• Check that any item below is applicable when the malfunctions occur.

• The engine stall occurs while driving or stopping the vehicle.
• When detecting the charging system error

Is the item applicable? 

YES: Check the error system.

• Perform ECM symptom diagnosis. Refer to "SYMPTOM TABLE ".
• Perform the symptom diagnosis for the charging system. Refer to "SYMPTOM TABLE ".

NO: Replace 4WAS front control unit. Refer to "EXPLODED VIEW ".