Toyota Tacoma (2015-2018) Service Manual: Transfer Shift Motor Control Circuit High (P17AA)

Toyota Tacoma (2015-2018) Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Transfer Shift Motor Control Circuit High (P17AA)

DESCRIPTION

This DTC is output when a short to B+ in the transfer shift motor and A.D.D. shift motor drive circuit is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P17AA	Transfer Shift Motor Control Circuit High	Diagnosis Condition: Directly after or while the ignition switch is turned to ON (transfer shift motor not operating) Malfunction Status: Short to B+ in the transfer shift motor and A.D.D. shift motor drive circuits Malfunction Time: 0.5 seconds or more (after the ignition switch is turned to ON, 0.05 seconds or more) Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Transfer shift actuator assembly A.D.D. actuator (differential vacuum actuator assembly)

WIRING DIAGRAM

Refer to DTC P17A9 (See page PROCEDURE )

PROCEDURE

1.	CHECK ACTUATOR ASSEMBLY (TRANSFER SHIFT MOTOR AND A.D.D. SHIFT MOTOR)

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

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

Standard Voltage:

Transfer shift actuator assembly side:

Tester Connection	Switch Condition	Specified Condition
F12-8 (TM1) or F12-7 (TM2) - Body ground	Ignition switch ON	Below 1 V

A.D.D. actuator (differential vacuum actuator assembly) side:

Tester Connection	Switch Condition	Specified Condition
F12-2 (DM1) or F12-6 (DM2) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

Result

Result	Proceed to
OK	A
NG (transfer shift actuator assembly side)	B
NG (A.D.D. actuator (differential vacuum actuator assembly) side)	C

REPLACE 4 WHEEL DRIVE CONTROL ECU

GO TO STEP 3

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

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F12-8 (TM1) or T4-2 (TM1) - Body ground	Ignition switch ON	Below 1 V
F12-7 (TM2) or T4-1 (TM2) - Body ground	Ignition switch ON	Below 1 V

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU AND DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY - BODY GROUND)

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

(b) Disconnect the A3 A.D.D. actuator (differential vacuum actuator assembly) connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F12-2 (DM1) or A3-1 (DM1) - Body ground	Ignition switch ON	Below 1 V
F12-6 (DM2) or A3-2 (DM2) - Body ground	Ignition switch ON	Below 1 V

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Transfer Shift Motor Control Circuit Low (P17A9)

DESCRIPTION This DTC is output when a short to ground in the transfer shift motor and A.D.D. shift motor drive circuit is detected. DTC No. Detection Item DTC Dete ...

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 Whe ...

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