Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Transfer Shift Motor Limit Switch Circuit (P17AC)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Transfer Shift Motor Limit Switch Circuit (P17AC)

DESCRIPTION

When the transfer switches modes, the TL1, TL2 and TL3 terminals of the limit switch are in one of the ON/OFF combinations listed in the table below.

Terminal

When 2WD

Switching between 2WD and H4

When H4

Switching between H4 and L4

When L4

TL1

ON (GND)

ON (GND)

OFF (OPEN)

OFF (OPEN)

OFF (OPEN)

TL2

OFF (OPEN)

OFF (OPEN)

OFF (OPEN)

ON (GND)

ON (GND)

TL3

OFF (OPEN)

ON (GND)

ON (GND)

ON (GND)

OFF (OPEN)

A malfunction is detected depending on the combination of the 3 circuits that make up the limit switch of the transfer shift actuator assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P17AC

Transfer Shift Motor Limit Switch Circuit

  • Diagnosis Condition: Directly after the ignition switch is turned to ON, or while switching between 2WD and H4 or while switching between H4 and L4 (transfer shift motor operating) with the ignition switch turned to ON
  • Malfunction Status: The combination of TL1, TL2 and TL3 does not match the pattern
  • Malfunction Time: 0 seconds
  • Other: 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Transfer shift actuator assembly

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER SHIFT ACTUATOR ASSEMBLY)

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

(b) Disconnect the T4 transfer shift actuator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F13-11 (TL1) - T4-3 (TL1)

Always

Below 1 Ω

F13-10 (TL2) - T4-4 (TL2)

Always

Below 1 Ω

F13-9 (TL3) - T4-5 (TL3)

Always

Below 1 Ω

T4-6 (GND1) - Body ground

Always

Below 1 Ω

F13-11 (TL1) or T4-3 (TL1) - Body ground

Always

10 kΩ or higher

F13-10 (TL2) or T4-4 (TL2) - Body ground

Always

10 kΩ or higher

F13-9 (TL3) or T4-5 (TL3) - Body ground

Always

10 kΩ or higher

F13-11 (TL1) - T4-4 (TL2) and T4-5 (TL3)

Always

10 kΩ or higher

F13-10 (TL2) - T4-3 (TL1) and T4-5 (TL3)

Always

10 kΩ or higher

F13-9 (TL3) - T4-3 (TL1) and T4-4 (TL2)

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE)

(a) Disconnect the transfer shift actuator assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

T4-3 (TL1) - Body ground

Ignition switch ON

10 to 14 V

T4-4 (TL2) - Body ground

Ignition switch ON

10 to 14 V

T4-5 (TL3) - Body ground

Ignition switch ON

10 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Transfer Shift Actuator Assembly)

OK

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

NG

REPLACE 4 WHEEL DRIVE CONTROL ECU

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