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:

Parts Location
PARTS LOCATION ILLUSTRATION *A for Double Cab *B for Access Cab *C w/ Back Door Power Window - - *1 NO. 1 BACK PANEL RELAY *2 NO. 2 BACK PANEL RELAY ...

Dtc Check / Clear
DTC CHECK / CLEAR 1. DTC CHECK USING TECHSTREAM (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes. (e) Check for DTCs. 2. DTC CLEAR USING TECHSTREAM (a) Conn ...

Power Window Switch Malfunction (B2312)
DESCRIPTION The power window regulator motor assembly is operated by the power window regulator master switch assembly or power window regulator switch assembly. The power window regulator motor assembly has motor, regulator and ECU functions. This DTC is output when the ECU built into the reg ...