4WD Control ECU Communication Stop Mode: Procedure

1. Turn the ignition switch off.
2. Disconnect the 4WD control ECU connector.
   Fig 1: Checking 4WD Control ECU E17 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector: (to 4WD Control ECU)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   E17-14 (CANH) - E17-16 (CANL)	Ignition switch off	54 to 69 Ω

NG → REPAIR OR REPLACE 4WD CONTROL ECU BRANCH WIRE OR CONNECTOR 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking 4WD Control ECU E17 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector: (to 4WD Control ECU)

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E17-11 (IG1) - Body ground	Ignition switch ON	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Checking 4WD Control ECU E17 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector: (to 4WD Control ECU)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E17-23 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL) 

OK → See step   4