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

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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)

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

REPLACE 4 WHEEL DRIVE CONTROL ECU

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