Toyota Tacoma 2015-2018 Service Manual: Automatic Disconnecting Differential Motor Control Circuit Open (P17A0)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Automatic Disconnecting Differential Motor Control Circuit Open (P17A0)

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P17A0	Automatic Disconnecting Differential Motor Control Circuit Open	Diagnosis Condition: While switching between 2WD and H4 (A.D.D. shift motor operating) with the ignition switch turned to ON Malfunction Status: Open circuit in the A.D.D. 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 A.D.D. actuator (differential vacuum actuator assembly)

WIRING DIAGRAM

Refer to DTC P17A9 (See page PROCEDURE ).

PROCEDURE

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F12-2 (DM1) - A3-1 (DM1)	Always	Below 1 Ω
F12-6 (DM2) - A3-2 (DM2)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY (A.D.D. SHIFT MOTOR)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (DM1) - 2 (DM2)	Always	1.5 to 10 Ω

Text in Illustration

*a	Component without harness connected (A.D.D. Actuator (Differential Vacuum Actuator Assembly))

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE DIFFERENTIAL VACUUM ACTUATOR ASSEMBLY

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