DTC P17A8: Transfer Shift Motor Control Circuit Circuit Open [08/2019 - ]: Procedure

1. Disconnect the F46 4 wheel drive control ECU connector.
2. Disconnect the B62 transfer shift actuator assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F46-8 (TM1) - B62-2 (TM1)	Always	Below 1 Ω
   F46-7 (TM2) - B62-1 (TM2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the B62 transfer shift actuator assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (TM1) - 1 (TM2)	Always	1.5 to 10 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Transfer Shift Actuator Assembly)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE 4 WHEEL DRIVE CONTROL ECU. Refer to  REMOVAL [08/2019 - ] 

Result: 

NG 

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY. Refer to  DISASSEMBLY [08/2019 - ]