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

Toyota Tundra Service Manual / Engine, Hybrid System / Wf1am Transfer / Touch Select 2-4 And High-low System / 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

  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other

Trouble Area

P279E

  1. Ignition switch is ON and engine is running
  2. 2-4 terminal signal is OFF (OPEN) and LO terminal signal is OFF (OPEN)
  3. 60 seconds or more
  4. 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 A25 4 wheel drive control ECU connector.

(b) Disconnect the J129 transfer position switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-12 (2-4) - J129-2 (2-4)

Always

Below 1 Ω

A25-11 (LO) - J129-3 (LO)

Always

Below 1 Ω

J129-5 (GND) - Body ground

Always

Below 1 Ω

A25-12 (2-4) or J129-2 (2-4) - Body ground

Always

10 kΩ or higher

A25-11 (LO) or J129-3 (LO) - Body ground

Always

10 kΩ or higher

A25-12 (2-4) or J129-2 (2-4) - A25-11 (LO) or J129-3 (LO)

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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)

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

REPLACE TRANSFER POSITION SWITCH

    Transfer Shift Motor Limit Switch Circuit (P17AC)

    System Voltage (P0560)

    See More:

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