Toyota Tundra Service Manual: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance (P279E)

DESCRIPTION

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

DTC Code

DTC Detection Condition

Trouble Area

P279E

WIRING DIAGRAM

PROCEDURE

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

(a) Disconnect the A25 4 wheel drive control ECU connector.

(b) Disconnect the J129 transfer position switch connector.

Standard Resistance:

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TRANSFER POSITION SWITCH

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
J129-2 (2-4) - Body ground	Ignition switch ON 2WD position	Below 1 V
	Ignition switch ON 4H position	Below 1.5 V
	Ignition switch ON 4L position	10.5 to 14 V
J129-3 (LO) - Body ground	Ignition switch ON 2WD position	10.5 to 14 V
	Ignition switch ON 4H position	Below 1.5 V
	Ignition switch ON 4L position	Below 1 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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Toyota Tundra Owners Manual