4WD Control ECU Communication Stop Mode [08/2016 - 11/2017]: Procedure

Result: 

NEXT 

See step  2

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2016 - 11/2017] )

Result: 

NEXT 

See step  3

1. Disconnect the 4WD ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   K1-14 (CANH) - K1-16 (CANL)	Ignition switch off	54 to 69 Ω

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO 4WD ECU ASSEMBLY (CAN-H, CAN-L) 

Result: 

OK 

See step  4

1. Connect the cable to the negative (-) battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2016 - 11/2017] )

2. Disconnect the 4WD ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K1-23 (GND) - Body ground	Always	Below 1 Ω

4. Measure the voltage according to the value(s) in the table below

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   K1-9 (BSLC) - Body ground	Always	11 to 14 V
   K1-11 (IG1) - Body ground	Ignition switch ON	11 to 14 V

Result: 

OK 

REPLACE 4WD ECU ASSEMBLY 

(Refer to REMOVAL [12/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR