Toyota Tacoma 2015-2018 Service Manual: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance (P279E)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Four Wheel Drive (4WD) Range Signal Circuit Range / Performance (P279E)

DESCRIPTION

When the transfer position switch is switched, the 2-4 terminal and LO terminal change to one of the following ON/OFF combinations listed in the table below.

Terminal	2WD	Between 2WD and H4	H4	Between H4 and L4	L4
2-4	ON	OFF	ON	OFF	OFF
LO	OFF	OFF	ON	OFF	ON

This DTC is detected if the transfer position switch 2-4 terminal and LO terminal signals are simultaneously received.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P279E	Four Wheel Drive (4WD) Range Signal Circuit Range / Performance	Diagnosis Condition: Ignition switch turned to ON Malfunction Status: The ON/OFF combination of the 2-4 terminal and LO terminal does not match the pattern Malfunction Time: 60 seconds or more Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Transfer position switch

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER POSITION SWITCH)

(a) Disconnect the F13 4 wheel drive control ECU connector.

(b) Disconnect the F15 transfer position switch connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F13-14 (2-4) - F15-2 (2-4)	Always	Below 1 Ω
F13-13 (LO) - F15-3 (LO)	Always	Below 1 Ω
F15-5 (GND) - Body ground	Always	Below 1 Ω
F13-14 (2-4) or F15-2 (2-4) - Body ground	Always	10 kΩ or higher
F13-13 (LO) or F15-3 (LO) - Body ground	Always	10 kΩ or higher
F13-14 (2-4) or F15-2 (2-4) - F13-13 (LO) or F15-3 (LO)	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TRANSFER POSITION SWITCH

(a) Remove the transfer position switch with its connector still connected.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F15-2 (2-4) - Body ground	Ignition switch ON 2WD position	Below 1.5 V
	Ignition switch ON H4 position	Below 1.5 V
	Ignition switch ON L4 position	10 to 14 V
F15-3 (LO) - Body ground	Ignition switch ON 2WD position	10 to 14 V
	Ignition switch ON H4 position	Below 1.5 V
	Ignition switch ON L4 position	Below 1.5 V

Text in Illustration

*a	Component with harness connected (Transfer Position Switch)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE TRANSFER POSITION SWITCH

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