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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)

Toyota Tacoma (2015-2018) Service Manual: 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

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.

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

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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)
OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

REPLACE TRANSFER POSITION SWITCH

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