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 F91 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) - F91-1 (2-4)	Always	Below 1 Ω
   F47-13 (LO) - F91-5 (LO)	Always	Below 1 Ω
   F91-3 (GND) - Body ground	Always	Below 1 Ω
   F47-14 (2-4) or F91-1 (2-4) - Body ground	Always	10 kΩ or higher
   F47-13 (LO) or F91-5 (LO) - Body ground	Always	10 kΩ or higher
   F47-14 (2-4) or F91-1 (2-4) - F47-13 (LO) or F91-5 (LO)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

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

   *a	Component with harness connected (Transfer Position Switch)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F91-1 (2-4) - Body ground	Ignition switch ON H2 position	Below 1.5 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	10 to 14 V
   F91-5 (LO) - Body ground	Ignition switch ON H2 position	10 to 14 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	Below 1.5 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2019 - ]