DTC P279E: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance [08/2019 - ]: Procedure

1. Disconnect the F47 4 wheel drive control ECU connector.
2. Disconnect the F73 transfer position switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F47-14 (2-4) - F73-1 (HI)	Always	Below 1 Ω
   F47-13 (LO) - F73-5 (LO)	Always	Below 1 Ω
   F73-3 (GND) - Body ground	Always	Below 1 Ω
   F47-14 (2-4) or F73-1 (HI) - Body ground	Always	10 kΩ or higher
   F47-13 (LO) or F73-5 (LO) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Remove the transfer position switch with its connector still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F73-1 (HI) - Body ground	Ignition switch ON H4F position	Below 1.5 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	10.5 to 14 V
   F73-5 (LO) - Body ground	Ignition switch ON H4F position	10.5 to 14 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Transfer Position Switch)

Result: 

OK 

REPLACE 4 WHEEL DRIVE CONTROL ECU. Refer to  REMOVAL [08/2015 - ] 

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2015 - ]