Toyota Tacoma (2015-2018) Service Manual: Transfer Shift Motor Control Circuit Circuit Open (P17A8)

Toyota Tacoma (2015-2018) Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Transfer Shift Motor Control Circuit Circuit Open (P17A8)

DESCRIPTION

This DTC is output when an open circuit in the transfer shift motor drive circuit is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P17A8	Transfer Shift Motor Control Circuit Circuit Open	Diagnosis Condition: 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: Open circuit in the transfer shift motor drive circuit Malfunction Time: 0.03 seconds or more Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Transfer shift actuator assembly

WIRING DIAGRAM

Refer to DTC P17A9 (See page PROCEDURE ).

PROCEDURE

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

(a) Disconnect the F12 4 wheel drive control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F12-8 (TM1) - T4-2 (TM1)	Always	Below 1 Ω
F12-7 (TM2) - T4-1 (TM2)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (TM1) - 1 (TM2)	Always	1.5 to 10 Ω

Text in Illustration

*a	Component without harness connected (Transfer Shift Actuator Assembly)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

Automatic Disconnecting Differential Motor Limit Switch Circuit (P17A4)

DESCRIPTION When the A.D.D. actuator switches between 2WD and 4WD, the DL1 and DL2 terminals of the limit switch and ADD terminal of the A.D.D. position switch change to one of the following ON/O ...

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 ...

Other materials:

Installation
INSTALLATION PROCEDURE 1. INSTALL POWER STEERING LINK (a) Insert the power steering link into the vehicle in the order shown in the illustration. Install in this Direction (1) Install in this Direction (2) (b) Using SST, inst ...

Satellite Radio Broadcast cannot be Received
CAUTION / NOTICE / HINT NOTICE: Some satellite radio broadcasts require payment. A contract must be made between a satellite radio company and the user. If the contract expires, it will not be possible to listen to the broadcast. After replacing the stereo component tuner assem ...

Operation Check
OPERATION CHECK 1. NOTICE WHEN CHECKING THE FOLLOWING (a) Wireless door lock/unlock function: This wireless door lock control function operates only when the following 3 conditions are met: (1) There is no key in the ignition key cylinder. (2) All doors are closed. (3) The power door lock sy ...